当前期刊: Publications of the Astronomical Society of Japan Go to current issue    加入关注   
显示样式:        排序: IF: - GO 导出
我的关注
我的收藏
您暂时未登录!
登录
  • Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IX. Identification of two red quasars at z > 5.6
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-08-08
    Nanako Kato; Yoshiki Matsuoka; Masafusa Onoue; Shuhei Koyama; Yoshiki Toba; Masayuki Akiyama; Seiji Fujimoto; Masatoshi Imanishi; Kazushi Iwasawa; Takuma Izumi; Nobunari Kashikawa; Toshihiro Kawaguchi; Chien-Hsiu Lee; Takeo Minezaki; Tohru Nagao; Akatoki Noboriguchi; Michael A Strauss

    We present the first discovery of dust-reddened quasars (red quasars) in the high-z universe (z > 5.6). This is a result from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which is based on the sensitive multi-band optical imaging data produced by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. We identified four red quasar candidates from the 93 spectroscopically

    更新日期:2020-08-09
  • Measurements of the Ca ii infrared triplet emission lines of pre-main-sequence stars
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-08-08
    Mai Yamashita; Yoichi Itoh; Yuhei Takagi

    We investigated the chromospheric activity of 60 pre-main-sequence (PMS) stars in four molecular clouds and five moving groups. It is considered that strong chromospheric activity is driven by the dynamo processes generated by stellar rotation. In contrast, several researchers have pointed out that the chromospheres of PMS stars are activated by mass accretion from their protoplanetary disks. In this

    更新日期:2020-08-09
  • Subaru Hyper Suprime-Cam view of quasar host galaxies at z < 1
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-08-05
    Toru Ishino; Yoshiki Matsuoka; Shuhei Koyama; Yuya Saeda; Michael A Strauss; Andy D Goulding; Masatoshi Imanishi; Toshihiro Kawaguchi; Takeo Minezaki; Tohru Nagao; Akatoki Noboriguchi; Malte Schramm; John D Silverman; Yoshiaki Taniguchi; Yoshiki Toba

    Active galactic nuclei (AGNs) are key in understanding the coevolution of galaxies and supermassive black holes (SMBHs). AGN activity is thought to affect the properties of their host galaxies via a process called “AGN feedback,” which drives the coevolution. From a parent sample of 1151 z < 1 type-1 quasars from the Sloan Digital Sky Survey quasar catalog, we detected the host galaxies of 862 of them

    更新日期:2020-08-06
  • Supersoft X-ray phases of recurrent novae as an indicator of their white dwarf masses
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-08-04
    Mariko Kato; Izumi Hachisu

    We have examined the optical/X-ray light curves of seven well-observed recurrent novae, V745 Sco, M31N 2008-12a, LMC N 1968, U Sco, RS Oph, LMC N 2009a, T Pyx, and one recurrent nova candidate LMC N 2012a. Six novae out of the eight show a simple relation that the duration of supersoft X-ray source (SSS) phase is 0.70 times the total duration of the outburst (= X-ray turnoff time), i.e., tSSS = 0.70 toff

    更新日期:2020-08-05
  • Optical and X-ray observations of stellar flares on an active M dwarf AD Leonis with the Seimei Telescope, SCAT, NICER, and OISTER
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-09
    Kosuke Namekata; Hiroyuki Maehara; Ryo Sasaki; Hiroki Kawai; Yuta Notsu; Adam F Kowalski; Joel C Allred; Wataru Iwakiri; Yohko Tsuboi; Katsuhiro L Murata; Masafumi Niwano; Kazuki Shiraishi; Ryo Adachi; Kota Iida; Motoki Oeda; Satoshi Honda; Miyako Tozuka; Noriyuki Katoh; Hiroki Onozato; Soshi Okamoto; Keisuke Isogai; Mariko Kimura; Naoto Kojiguchi; Yasuyuki Wakamatsu; Yusuke Tampo; Daisaku Nogami;

    We report on multi-wavelength monitoring observations of an M-dwarf flare star AD Leonis with the Seimei Telescope (6150–7930 Å), SCAT (Spectroscopic Chuo-university Astronomical Telescope; 3700–7500 Å), and NICER (Neutron Star Interior Composition Explorer; 0.2–12.0 keV), with the collaboration of the OISTER (Optical and Infrared Synergetic Telescopes for Education and Research) program. Twelve flares

    更新日期:2020-08-04
  • ALMA twenty-six arcmin2 survey of GOODS-S at one millimeter (ASAGAO): Millimeter properties of stellar mass selected galaxies
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-30
    Yuki Yamaguchi; Kotaro Kohno; Bunyo Hatsukade; Tao Wang; Yuki Yoshimura; Yiping Ao; James S Dunlop; Eiichi Egami; Daniel Espada; Seiji Fujimoto; Natsuki H Hayatsu; Rob J Ivison; Tadayuki Kodama; Haruka Kusakabe; Tohru Nagao; Masami Ouchi; Wiphu Rujopakarn; Ken-ichi Tadaki; Yoichi Tamura; Yoshihiro Ueda; Hideki Umehata; Wei-Hao Wang

    We make use of the ALMA twenty-Six Arcmin2 survey of GOODS-S At One-millimeter (ASAGAO), deep 1.2 mm continuum observations of a 26-arcmin2 region in the Great Observatories Origins Deep Survey-South (GOODS-S) obtained with Atacama Large Millimeter/sub-millimeter Array (ALMA), to probe dust-enshrouded star formation in K-band selected (i.e., stellar mass selected) galaxies, which are drawn from the

    更新日期:2020-08-04
  • Periodically repeating fast radio bursts: Lense–Thirring precession of a debris disk?
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-29
    Wen-Cong Chen

    Recently, repeating fast radio bursts (FRBs) with a period of PFRB = 16.35 ± 0.18 d from FRB 180916.J0158+65 were reported. It still remains controversial how such a periodicity might arise for this FRB. In this Letter, based on an assumption of a young pulsar surrounding by a debris disk, we attempt to diagnose whether Lense–Thirring precession of the disk on the emitter can produce the observed periodicity

    更新日期:2020-08-04
  • New timing measurement results of 16 pulsars
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-26
    Jie Liu; Zhen Yan; Zhi-Qiang Shen; Zhi-Peng Huang; Ru-Shuang Zhao; Ya-Jun Wu; Jian-Ping Yuan; Xin-Ji Wu

    A pulsar’s position, proper motion, and parallax are important parameters in timing equations. It is challenging to fit astrometric parameters accurately through pulsar timing, especially for pulsars that show irregular timing properties. With the fast development of related techniques, it is possible to measure astrometric parameters of more and more pulsars in a model-independent manner with very-long-baseline

    更新日期:2020-08-04
  • Astrometry and infrared observations of the Mira variable stars AP Lyncis, V837 Herculis, and BX Camelopardalis: Implications for the period–luminosity relation of the Milky Way
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-19
    James O Chibueze; Riku Urago; Toshihiro Omodaka; Yuto Morikawa; Masayuki Y Fujimoto; Akiharu Nakagawa; Takahiro Nagayama; Takumi Nagayama; Ken Hirano

    AP Lyn and V837 Her are long-period Mira variable stars in the Milky Way. We performed VLBI Exploration of Radio Astrometry (VERA) phase-referenced observations towards H2O masers associated with AP Lyn and V837 Her. The annual parallaxes of AP Lyn and V837 Her were obtained to be 2.008 ± 0.038 mas and 1.090 ± 0.014 mas, corresponding to distances of 498 ± 10 pc and 917 ± 12 pc, respectively. From

    更新日期:2020-08-04
  • Probing cosmic rays with Fe Kα line structures generated by multiple ionization process
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-18
    Hiromichi Okon; Makoto Imai; Takaaki Tanaka; Hiroyuki Uchida; Takeshi Go Tsuru

    Supernova remnants (SNRs) have been regarded as major acceleration sites of Galactic cosmic rays. Recent X-ray studies revealed neutral Fe Kα line emission from dense gas in the vicinity of some SNRs, which can be best interpreted as K-shell ionization of Fe atoms in the gas by sub-relativistic particles accelerated in the SNRs. In this Letter, we propose a novel method of constraining the composition

    更新日期:2020-08-04
  • Star formation rates in the L 1482 filament of the California molecular cloud
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-11
    Toshihiro Omodaka; Takumi Nagayama; Kazuhito Dobashi; James O Chibueze; Akifumi Yamabi; Yoshito Shimajiri; Shinnosuke Inoue; Shota Hamada; Kazuyoshi Sunada; Yuji Ueno

    We measured the trigonometric parallax of the H2O maser source associated with the L 1482 molecular filament hosting the most massive young star, LkHα 101, in the California molecular cloud. The measured parallax is 1.879 ± 0.096 mas, corresponding to the distance of 532 ± 28 pc. This parallax is consistent with that of the nearby star cluster LkHα 101, which was recently measured with Gaia DR2. We

    更新日期:2020-08-04
  • 86-GHz SiO masers in Galactic centre OH/IR stars
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-11
    Maria Messineo; Lorant O Sjouwerman; Harm J Habing; Alain Omont

    We present results on a search for 86.243-GHz SiO (J = 2→1, |$v$| = 1) maser emission toward 67 OH/IR stars located near the Galactic centre. We detected 32 spectral peaks, of which 28 correspond to SiO maser lines arising from the envelopes of these OH/IR stars. In OH/IR stars, we obtained an SiO maser detection rate of about |$40\%$|⁠. We serendipitously detected two other lines from OH/IR stars

    更新日期:2020-08-04
  • Spatially resolved molecular gas properties of host galaxy of Type I superluminous supernova SN 2017egm
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-10
    Bunyo Hatsukade; Kana Morokuma-Matsui; Masao Hayashi; Nozomu Tominaga; Yoichi Tamura; Kotaro Niinuma; Kazuhiro Motogi; Tomoki Morokuma; Yuichi Matsuda

    We present the results of CO(1–0) observations of the host galaxy of a Type I superluminous supernova (SLSN-I), SN 2017egm, one of the closest SLSNe-I at z = 0.03063, by using the Atacama Large Millimeter/submillimeter Array. The molecular gas mass of the host galaxy is Mgas = (4.8 ± 0.3) × 109 M⊙, placing it on the sequence of normal star-forming galaxies in an Mgas–star-formation rate (SFR) plane

    更新日期:2020-08-04
  • The splashback radius of optically selected clusters with Subaru HSC Second Public Data Release
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-08
    Ryoma Murata; Tomomi Sunayama; Masamune Oguri; Surhud More; Atsushi J Nishizawa; Takahiro Nishimichi; Ken Osato

    Recent constraints on the splashback radius around optically selected galaxy clusters from the redMaPPer cluster-finding algorithm in the literature have shown that the observed splashback radius is |${\sim}20\%$| smaller than that predicted by N-body simulations. We present analyses on the splashback features around ∼ 3000 optically selected galaxy clusters detected by the independent cluster-finding

    更新日期:2020-08-04
  • FLASHING: New high-velocity H2O masers in IRAS 18286−0959
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-05
    Hiroshi Imai; Yuri Uno; Daichi Maeyama; Ryosuke Yamaguchi; Kei Amada; Yuhki Hamae; Gabor Orosz; José F Gómez; Daniel Tafoya; Lucero Uscanga; Ross A Burns

    We discovered new high-velocity components of H2O maser emission in one of the “water fountain” sources, IRAS 18286−0959, which has been monitored using the Nobeyama 45 m telescope in the FLASHING (Finest Legacy Acquisitions of SiO- and H2O-maser Ignitions by Nobeyama Generation) project since 2018 December. The maser spectra show new components with extremely high expansion velocities (>200 km s−1

    更新日期:2020-08-04
  • A numerical light curve model for interaction-powered supernovae
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-05
    Yuki Takei; Toshikazu Shigeyama

    We construct a numerical light curve model for interaction-powered supernovae that arise from an interaction between the ejecta and the circumstellar matter (CSM). In order to resolve the shocked region of an interaction-powered supernova, we solve the fluid equations and radiative transfer equation assuming steady states in the rest frames of the reverse and forward shocks at each time step. Then

    更新日期:2020-08-04
  • Investigation of contact binaries in the field of NGC 6811
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-29
    Li X, Liu L, Zhang X.

    AbstractContact binary systems are very important for studying physical processes such as strong interactions between stars, mass transfer, and stellar merger. Further, the members of an open cluster have the same age, metal abundance, and interstellar extinction conditions. Therefore, we can conduct a comparative study on the different binary systems of the same open cluster. NGC 6811 is an observed

    更新日期:2020-08-04
  • VEDA: VERA data analysis software for VLBI phase-referencing astrometry
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-29
    Takumi Nagayama; Tomoya Hirota; Mareki Honma; Tomoharu Kurayama; Yuuki Adachi; Yoshiaki Tamura; Yukitoshi Kanya

    We present the VEra Data Analyzer (VEDA) software package for Very Long Baseline Interferometry (VLBI) phase-referencing observations and parallax measurements. The Japanese VLBI project VLBI Exploration of Radio Astrometry (VERA) provides high-precision astrometric results at the 10 μas level. To achieve this precision, accurate calibration of the atmospheric phase fluctuation, the instrumental phase

    更新日期:2020-08-04
  • Discovery of radio jets in the Phoenix galaxy cluster center
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-27
    Takuya Akahori; Tetsu Kitayama; Shutaro Ueda; Takuma Izumi; Kianhong Lee; Ryohei Kawabe; Kotaro Kohno; Masamune Oguri; Motokazu Takizawa

    We report the results of the Australia Telescope Compact Array (ATCA) 15 mm observation of the Phoenix galaxy cluster possessing an extreme star-burst brightest cluster galaxy (BCG) at the cluster center. We spatially resolved radio emission around the BCG, and found diffuse bipolar and bar-shape structures extending from the active galactic nucleus (AGN) of the BCG. They are likely radio jets/lobes

    更新日期:2020-08-04
  • Trigonometric parallax of O-rich Mira variable star OZ Gem (IRAS 07308+3037): A confirmation of the difference between the P–L relations of the Large Magellanic Cloud and the Milky Way
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-27
    Riku Urago; Ryohei Yamaguchi; Toshihiro Omodaka; Takumi Nagayama; James O Chibueze; Masayuki Y Fujimoto; Takahiro Nagayama; Akiharu Nakagawa; Yuji Ueno; Miho Kawabata; Tatsuya Nakaoka; Kengo Takagi; Masayuki Yamanaka; Koji Kawabata

    OZ Geminorum (OZ Gem) is a galactic Mira variable in the Milky Way (MW). We measured its annual parallax with VLBI Exploration of Radio Astrometry to be π = 0.806 ± 0.039 mas, corresponding to a distance of D = 1.24 ± 0.06 kpc. Based on multi-epoch infrared observations with the Kagoshima University 1 m telescope, we also derived the mean J-, H-, and K′-band magnitudes of OZ Gem to be 5.75 ± 0.47 mag

    更新日期:2020-08-04
  • Discovery of recombining plasma associated with the candidate supernova remnant G189.6+3.3 with Suzaku
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-30
    Shigeo Yamauchi; Moe Oya; Kumiko K Nobukawa; Thomas G Pannuti

    We present the results of an X-ray spectral analysis of the northeast region of the candidate supernova remnant G189.6+3.3 with Suzaku. K-shell lines from highly ionized Ne, Mg, Si, and S were detected in the spectrum for the first time. In addition, a radiative recombining continuum (RRC) from He-like Si was clearly seen near 2.5 keV. This detection of an RRC reveals for the first time that G189.6+3

    更新日期:2020-07-31
  • A study of the physical properties of an active asteroid (6478 Gault)
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-27
    Zhong-Yi Lin; Yu-Li Cheng; Jean-Baptiste Vincent; Xi-Liang Zhang; Wing Huen Ip; Hsin-Chang Chi

    In 2019 January, the appearance of asteroid 6478 Gault immediately attracted attention because this object exhibited a long and thin tail that was quite different from the usual asteroids. This unexpected morphology placed asteroid 6478 Gault into the catalogue of active asteroids. We acquired photometric and spectroscopic observations on 37 nights from 2019 January to April using several telescopes

    更新日期:2020-07-28
  • Weak-lensing clusters from HSC survey first-year data: Mitigating the dilution effect of foreground and cluster-member galaxies
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-22
    Takashi Hamana; Masato Shirasaki; Yen-Ting Lin

    We present a weak-lensing cluster search using Hyper Suprime-Cam Subaru Strategic Program (HSC survey) first-year data. We pay special attention to the dilution effect of cluster-member and foreground galaxies on weak-lensing signals from clusters of galaxies; we adopt the globally normalized weak-lensing estimator which is least affected by cluster-member galaxies, and we select source galaxies by

    更新日期:2020-07-28
  • ALMA observations of PSR B1259−63/LS 2883 in an inactive period: Variable circumstellar disk?
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-22
    Yutaka Fujita; Hiroshi Nagai; Takuya Akahori; Akiko Kawachi; Atsuo T Okazaki

    We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of the gamma-ray binary system containing the pulsar PSR B1259−63 orbiting around a massive star LS 2883 in an inactive period between the 2017 and 2021 periastron passages. We detected radio continuum emission from the binary system at 97 GHz (Band 3) and 343 GHz (Band 7). Compared with our previous ALMA observations performed

    更新日期:2020-07-22
  • Observations of V404 Cygni during the 2015 outburst by the Nasu telescope array at 1.4 GHz
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-22
    Kuniyuki Asuma; Kotaro Niinuma; Kazuhiro Takefuji; Takahiro Aoki; Sumiko Kida; Hirochika Nakajima; Kimio Tsubono; Tsuneaki Daishido

    Waseda University Nasu telescope array is a spatial fast Fourier transform interferometer consisting of eight linearly aligned antennas with 20 m spherical dishes. This type of interferometer was developed to survey transient radio sources with an angular resolution as high as that of a 160 m dish and a field of view as wide as that of a 20 m dish. We have been performing drift-scan-mode observations

    更新日期:2020-07-22
  • Numerical simulation of solar photospheric jet-like phenomena caused by magnetic reconnection
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-16
    Yuji Kotani; Kazunari Shibata

    Jet phenomena with a bright loop in their footpoint, called anemone jets, have been observed in the solar corona and chromosphere. These jets are formed as a consequence of magnetic reconnection, and from the scale universality of magnetohydrodynamics (MHD), it can be expected that anemone jets exist even in the solar photosphere. However, it is not necessarily apparent that jets can be generated as

    更新日期:2020-07-16
  • Spectroscopic properties of the dwarf nova-type cataclysmic variables observed by LAMOST
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-13
    Zhongtao Han; Soonthornthum Boonrucksar; Shengbang Qian; Fang Xiaohui; Qishan Wang; Liying Zhu; Aijun Dong; Qijun Zhi

    Spectra of 76 known dwarf novae from the LAMOST survey were presented. Most of the objects were observed in quiescence, and about 16 systems have typical outburst spectra. 36 of these systems were observed by SDSS, and most of their spectra are similar to the SDSS spectra. Two objects, V367 Peg and V537 Peg, are the first spectra of the object. The spectrum of V367 Peg shows a contribution from an

    更新日期:2020-07-13
  • Feature selection for classification of blazars based on optical photometric and polarimetric time-series data
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-10
    Makoto Uemura; Taisei Abe; Yurika Yamada; Shiro Ikeda

    Blazars can be divided into two subtypes, flat spectrum radio quasars (FSRQs) and BL Lac objects, which have been distinguished phenomenologically by the strength of their optical emission lines, while their physical nature and relationship are still not fully understood. We focus on the differences in their variability. We characterize the blazar variability using the Ornstein–Uhlenbeck (OU) process

    更新日期:2020-07-10
  • Comprehensive photometric investigation of an active early K-type contact system—IL Cancri
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-09
    Nian-Ping Liu; Thawicharat Sarotsakulchai; Somsawat Rattanasoon; Bin Zhang

    Comprehensive photometric investigation of the early K-type contact binary IL Cnc was carried out. A few light curves from both ground-based telescopes and the Kepler space telescope were obtained (or downloaded) and then analyzed in detail. They are mostly found to be asymmetric and there are even continuously changing O’Connell effects in the light curves from Kepler K2 data, suggesting the system

    更新日期:2020-07-09
  • Study on the escape timescale of high-energy particles from supernova remnants through thermal X-ray properties
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-04
    Hiromasa Suzuki; Aya Bamba; Ryo Yamazaki; Yutaka Ohira

    In the current decade, GeV/TeV gamma-ray observations of several supernova remnants (SNRs) have implied that accelerated particles are escaping from their acceleration sites. However, when and how they escape from the SNR vicinities are yet to be understood. Recent studies have suggested that the particle escape might develop with thermal plasma ages of the SNRs. We present a systematic study on the

    更新日期:2020-07-05
  • Massive core/star formation triggered by cloud–cloud collision: Effect of magnetic field
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-07-03
    Nirmit Sakre; Asao Habe; Alex R Pettitt; Takashi Okamoto

    We study the effect of magnetic field on massive dense core formation in colliding unequal molecular clouds by performing magnetohydrodynamic simulations with sub-parsec resolution (0.015 pc) that can resolve the molecular cores. Initial clouds with the typical gas density of the molecular clouds are immersed in various uniform magnetic fields. The turbulent magnetic fields in the clouds consistent

    更新日期:2020-07-03
  • Cloud structures in M 17 SWex : Possible cloud–cloud collision
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-26
    Shinichi W Kinoshita; Fumitaka Nakamura; Quang Nguyen-Luong; Benjamin Wu; Tomomi Shimoikura; Koji Sugitani; Kazuhito Dobashi; Hideaki Takemura; Patricio Sanhueza; Kee-Tae Kim; Hyunwoo Kang; Neal J Evans; Glenn J White; Cassandra Fallscheer

    Using wide-field 13CO (J = 1−0) data taken with the Nobeyama 45 m telescope, we investigate cloud structures of the infrared dark cloud complex in M 17 with Spectral Clustering for Interstellar Molecular Emission Segmentation. In total, we identified 118 clouds that include 11 large clouds with radii larger than 1 pc. The clouds are mainly distributed in the two representative velocity ranges of 10–20 km s−1

    更新日期:2020-06-27
  • High-mass star formation in Orion B triggered by cloud–cloud collision: Merging molecular clouds in NGC 2024
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-17
    Rei Enokiya; Akio Ohama; Rin Yamada; Hidetoshi Sano; Shinji Fujita; Katsuhiro Hayashi; Daichi Tsutsumi; Kazufumi Torii; Atsushi Nishimura; Ryotaro Konishi; Hiroaki Yamamoto; Kengo Tachihara; Yutaka Hasegawa; Kimihiro Kimura; Hideo Ogawa; Yasuo Fukui

    We performed new comprehensive 13CO(J = 2–1) observations toward NGC 2024, the most active star-forming region in Orion B, with an angular resolution of ∼100″ obtained with Nanten2. We found that the associated cloud consists of two independent velocity components. The components are physically connected to the H ii region as evidenced by their close correlation with the dark lanes and the emission

    更新日期:2020-06-18
  • Triggered high-mass star formation in the H ii region W 28 A2: A cloud–cloud collision scenario
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-13
    Katsuhiro Hayashi; Satoshi Yoshiike; Rei Enokiya; Shinji Fujita; Rin Yamada; Hidetoshi Sano; Kazufumi Torii; Mikito Kohno; Atsushi Nishimura; Akio Ohama; Hiroaki Yamamoto; Kengo Tachihara; Graeme Wong; Nigel Maxted; Catherine Braiding; Gavin Rowell; Michael Burton; Yasuo Fukui

    We report on a study of the high-mass star formation in the H ii region W 28 A2 by investigating the molecular clouds that extend over ∼5–10 pc from the exciting stars using the 12CO and 13CO (J = 1–0) and 12CO (J = 2–1) data taken by NANTEN2 and Mopra observations. These molecular clouds consist of three velocity components with CO intensity peaks at VLSR ∼ −4 km s−1, 9 km s−1, and 16 km s−1. The

    更新日期:2020-06-13
  • ALMA CO observations of a giant molecular cloud in M 33: Evidence for high-mass star formation triggered by cloud–cloud collisions
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-12
    Hidetoshi Sano; Kisetsu Tsuge; Kazuki Tokuda; Kazuyuki Muraoka; Kengo Tachihara; Yumiko Yamane; Mikito Kohno; Shinji Fujita; Rei Enokiya; Gavin Rowell; Nigel Maxted; Miroslav D Filipović; Jonathan Knies; Manami Sasaki; Toshikazu Onishi; Paul P Plucinsky; Yasuo Fukui

    We report the first evidence for high-mass star formation triggered by collisions of molecular clouds in M 33. Using the Atacama Large Millimeter/submillimeter Array, we spatially resolved filamentary structures of giant molecular cloud 37 in M 33 using 12CO(J = 2–1), 13CO(J = 2–1), and C18O(J = 2–1) line emission at a spatial resolution of ∼2 pc. There are two individual molecular clouds with a systematic

    更新日期:2020-06-12
  • The formation of young massive clusters triggered by cloud–cloud collisions in the Antennae galaxies NGC 4038/NGC 4039
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-06-03
    Kisetsu Tsuge; Yasuo Fukui; Kengo Tachihara; Hidetoshi Sano; Kazuki Tokuda; Junko Ueda; Daisuke Iono; Molly K Finn

    The formation mechanism of super star clusters (SSCs), present-day analogs of the ancient globulars, still remains elusive. The major merger that is the Antennae galaxies is forming SSCs and is one of the primary targets to test the cluster formation mechanism. We reanalyzed the archival ALMA CO data of the Antennae and found three typical observational signatures of a cloud–cloud collision toward

    更新日期:2020-06-03
  • First detection of two superoutbursts during the rebrightening phase of a WZ Sge-type dwarf nova: TCP J21040470+4631129
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-27
    Yusuke Tampo; Kojiguchi Naoto; Keisuke Isogai; Taichi Kato; Mariko Kimura; Yasuyuki Wakamatsu; Daisaku Nogami; Tonny Vanmunster; Tamás Tordai; Hidehiko Akazawa; Felipe Mugas; Taku Nishiumi; Víctor J S Béjar; Kiyoe Kawauchi; Nicolas Crouzet; Noriharu Watanabe; Núria Casasayas-Barris; Yuka Terada; Akihiko Fukui; Norio Narita; Enric Palle; Motohide Tamura; Nobuhiko Kusakabe; Roi Alonso; Hiroshi Itoh;

    We report on photometric and spectroscopic observations and analysis of the 2019 superoutburst of TCP J21040470+4631129. This object showed a 9 mag superoutburst with early superhumps and ordinary superhumps, which are the features of WZ Sge-type dwarf novae. Five rebrightenings were observed after the main superoutburst. The spectra during the post-superoutburst stage showed Balmer, He i, and possible

    更新日期:2020-05-27
  • Properties of the environment around active galactic nucleus / luminous galaxy pairs through the HSC wide survey
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-25
    Yuji Shirasaki; Masayuki Akiyama; Yoshiki Toba; Wanqiu He; Tomotsugu Goto

    We investigated the properties of active galactic nucleus (AGN) environments, particularly environments where the association of a luminous galaxy (LG) is found within 4 Mpc from an AGN with redshift 0.8–1.1. For comparison, three additional AGN environments, (namely, AGNs of all types, type 1 AGNs with X-ray and/or radio detection, and type 2 AGNs) and an environment of blue M*, the characteristic

    更新日期:2020-05-25
  • Star cluster formation in Orion A
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-25
    Wanggi Lim; Fumitaka Nakamura; Benjamin Wu; Thomas G Bisbas; Jonathan C Tan; Edward Chambers; John Bally; Shuo Kong; Peregrine McGehee; Dariusz C Lis; Volker Ossenkopf-Okada; Álvaro Sánchez-Monge

    We introduce new analysis methods for studying the star cluster formation processes in Orion A, especially examining the scenario of a cloud–cloud collision. We utilize the CARMA–NRO Orion survey 13CO (1–0) data to compare molecular gas to the properties of young stellar objects from the SDSS III IN-SYNC survey. We show that the increase of |$v_{\rm {}^{13}CO} - v_{\rm YSO}$| and Σ scatter of older

    更新日期:2020-05-25
  • X-ray emission from the mixed-morphology supernova remnant HB 9
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-25
    Mariko Saito; Shigeo Yamauchi; Kumiko K Nobukawa; Aya Bamba; Thomas G Pannuti

    We present the results of a spectral analysis of the central region of the mixed-morphology supernova remnant HB 9. A prior Ginga observation of this source detected a hard X-ray component above 4 keV, and the origin of this particular X-ray component is still unknown. Our results demonstrate that the extracted X-ray spectra are best represented by a model consisting of a collisional ionization equilibrium

    更新日期:2020-05-25
  • Performance of VERA in 10 micro-arcsecond astrometry
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-25
    Takumi Nagayama; Hideyuki Kobayashi; Tomoya Hirota; Mareki Honma; Takaaki Jike; Mi Kyoung Kim; Akiharu Nakagawa; Toshihiro Omodaka; Tomoaki Oyama; Daisuke Sakai; Katsunori M Shibata; Yoshiaki Tamura

    Very Long Baseline Interferometry (VLBI) astrometry using the phase-referencing technique remains an open issue for the quantitative characterization of the observing conditions to achieve a feasible parallax precision of 10 micro-arcseconds (μas). To address this issue, we evaluated the astrometric performance of the VLBI Exploration of Radio Astrometry (VERA) through the parallax measurements of

    更新日期:2020-05-25
  • FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN). VII. Molecular fraction of H i clouds
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-23
    Hiroyuki Nakanishi; Shinji Fujita; Kengo Tachihara; Natsuko Izumi; Mitsuhiro Matsuo; Tomofumi Umemoto; Yumiko Oasa; Tsuyoshi Inoue

    We analyze molecular-gas formation in neutral atomic hydrogen (H i) clouds using the latest CO data, obtained from the FOREST (four-beam receiver system on the 45 m telescope) unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope, and using H i data taken from the Very Large Array Galactic plane survey. We applied a dendrogram algorithm to the H i data cube to identify H i clouds

    更新日期:2020-05-23
  • A method for unmasking incomplete astronomical signals: Application to the CO Multi-line Imaging of Nearby Galaxies project
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-22
    Suchetha Cooray; Tsutomu T Takeuchi; Moe Yoda; Kazuo Sorai

    Photometric surveys have provided incredible amounts of astronomical information in the form of images. However, astronomical images often contain artifacts that can critically hinder scientific analysis by misrepresenting intensities or contaminating catalogs as artificial objects. These affected pixels need to be masked and dealt with in any data reduction pipeline. We present a flexible, iterative

    更新日期:2020-05-22
  • The Seimei telescope project and technical developments
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-22
    Mikio Kurita; Masaru Kino; Fumihide Iwamuro; Kouji Ohta; Daisaku Nogami; Hideyuki Izumiura; Michitoshi Yoshida; Kazuya Matsubayashi; Daisuke Kuroda; Yoshikazu Nakatani; Kodai Yamamoto; Hironori Tsutsui; Masatsugu Iribe; Ichiro Jikuya; Hiroshi Ohtani; Kazunari Shibata; Keisuke Takahashi; Hitoshi Tokoro; Toshinori Maihara; Tetsuya Nagata

    An overview of the Seimei telescope, a 3.8 m optical infrared telescope located on Mt. Chikurinji in the Okayama prefecture of Japan, is presented. Seimei is a segmented-mirror telescope whose primary mirror consists of 18 petal-shaped segments. The telescope tube supporting the thin segmented mirrors is structurally incorporated within large arc-rails providing the elevation axis. The tube has a light-weight

    更新日期:2020-05-22
  • The spectra of evolved stars at 20–25 GHz: Tracing circumstellar chemistry during the asymptotic giant branch to planetary nebula transition
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-22
    Yong Zhang; Wayne Chau; Jun-ichi Nakashima; Sun Kwok

    We report an unbiased radio line survey towards the circumstellar envelopes of evolved stars at the frequency range from 20 to 25 GHz, aiming to obtain a more complete unbiased picture of the chemical evolution in the final stages of stellar evolution. The observation sample includes the asymptotic giant branch (AGB) star IRC +10216, the proto-planetary nebulae (PPNs) CRL 2688 and CRL 618, and the

    更新日期:2020-05-22
  • Variations of the physical parameters of the blazar Mrk 421 based on analysis of the spectral energy distributions
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-21
    Yurika Yamada; Makoto Uemura; Ryosuke Itoh; Yasushi Fukazawa; Masanori Ohno; Fumiya Imazato

    We report on the variations of the physical parameters of the jet observed in the blazar Mrk 421, and discuss the origin of X-ray flares in the jet, based on analysis of several spectral energy distributions (SEDs). The SEDs are modeled using the one-zone synchrotron self-Compton model, its parameters determined using a Markov chain Monte Carlo method. The lack of data at TeV energies means many of

    更新日期:2020-05-21
  • Gaia’s detectability of black hole–main sequence star binaries formed in open clusters
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-21
    Minori Shikauchi; Jun Kumamoto; Ataru Tanikawa; Michiko S Fujii

    Black hole–main sequence star (BH–MS) binaries are one of the targets of future data releases of the astrometric satellite Gaia. They are supposed to be formed in two main sites: a galactic field and star clusters. However, previous work has never predicted the number of BH–MS binaries originating in the latter sites. In this paper we estimate the number of BH–MS binaries formed in open clusters and

    更新日期:2020-05-21
  • Diversity of γ-ray and radio variability of bright blazars and implications for γ-ray emission location
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-20
    Hai-Ming Zhang; Zhen-Jie Wang; Jin Zhang; Ting-Feng Yi; Liang Chen; Rui-Jing Lu; En-Wei Liang

    Violent multi-wavelength variabilities are observed in γ-ray-selected blazars. We present an analysis of long-term light curves for eight bright blazars to explore the co-variation pattern in the γ-ray and radio bands. We extract their γ-ray light curves and spectra with data observed by the Fermi Large Area Telescope (LAT) since 2008. We find diverse co-variation patterns between the γ-ray and radio

    更新日期:2020-05-20
  • Detection of tidal tails around the open cluster M 67 using principal component analysis
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-19
    Xinhua Gao

    In this paper we present an investigation of tidal tails around the old open cluster M 67 using Gaia-DR2. We identify likely extra-tidal stars around M 67 using principal component analysis (PCA) and a Gaussian mixture model (GMM). We find 1618 stars closely related to M 67, 85 of which are likely extra-tidal stars. We find clear evidence for the existence of two well-defined tidal tails emerging from

    更新日期:2020-05-19
  • Annual parallax measurement of the Mira variable star BX Camelopardalis with VERA
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-16
    Masako Matsuno; Akiharu Nakagawa; Atsushi Morita; Tomoharu Kurayama; Toshihiro Omodaka; Takumi Nagayama; Mareki Honma; Katsunori M Shibata; Yuji Ueno; Takaaki Jike; Yoshiaki Tamura

    We report the results of astrometric VLBI observations toward the Mira variable star BX Cam using the VERA VLBI array. The observation was performed from 2012 February to 2014 November. The parallax obtained is 1.73 ± 0.03 mas corresponding to a distance of 0.58 ± 0.01 kpc. The parallax of this source was reported in Gaia DR2 as 4.13 ± 0.25 mas, and there is a 240% difference between these two measurements

    更新日期:2020-05-16
  • Discovery of a transient X-ray source Suzaku J1305−4930 in NGC 4945
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-12
    Shuntaro Ide; Kiyoshi Hayashida; Hirofumi Noda; Hiroyuki Kurubi; Tomokage Yoneyama; Hironori Matsumoto

    We report the serendipitous discovery of a transient X-ray source, Suzaku J1305−4930, ∼3 kpc southwest of the nucleus of the Seyfert 2 galaxy NGC 4945. Among the seven Suzaku observations of NGC 4945 from 2005 to 2011, Suzaku J1305−4930 was detected four times in July and August in 2010. The X-ray spectra are better approximated with a multi-color disk model than a power-law model. At the first detection

    更新日期:2020-05-12
  • HCN 3–2 survey towards a sample of local galaxies
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-05-04
    Fei Li; Junzhi Wang; Min Fang; Qing-Hua Tan; Zhi-Yu Zhang; Yu Gao; Shanghuo Li

    We present observations of HCN 3–2 emissions towards 37 local galaxies using the 10 m Submillimeter Telescope. HCN 3–2 emission is detected in 23 galaxies. The correlation of infrared luminosity (LIR) and the luminosity of HCN 3–2 line emission measured in our sample is fitted with a slope of 1.11 and correlation coefficient of 0.91, which follows the linear correlation found in other dense gas tracers

    更新日期:2020-05-04
  • Formation rate of LB-1-like systems through dynamical interactions
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-04-30
    Ataru Tanikawa; Tomoya Kinugawa; Jun Kumamoto; Michiko S Fujii

    We estimate formation rates of LB-1-like systems through dynamical interactions in the framework of the theory of stellar evolution before the discovery of the LB-1 system. The LB-1 system contains a ∼70 |${M_{\odot}}$| black hole (BH), a so-called pair instability (PI) gap BH, and a B-type star with solar metallicity, and has nearly zero eccentricity. The most efficient formation mechanism is as follows

    更新日期:2020-04-30
  • Astrometry of H2O masers in the W 48 A (G35.20−01.74) H ii region with VERA: A compact disk outflow inside core H-2a
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-04-27
    James O Chibueze; Takumi Nagayama; Toshihiro Omodaka; Masayuki Nagano; Koji Wada; Ken Hirano

    W 48 A core H-2a is one of the young massive protostellar objects in the W 48 region. We conducted multi-epoch astrometric observations of the water (H2O) masers associated with the W 48 A core H-2a with VLBI Exploration of Radio Astrometry (VERA). The trigonometric annual parallax of W 48 A core H-2a was measured to be 0.433 ± 0.026 mas, corresponding to a distance of |$2.31^{+0.15}_{-0.13}$| kpc

    更新日期:2020-04-27
  • A low-cost and duplicable portable solar adaptive optics system based on LabVIEW hybrid programming
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-04-24
    Deqing Ren; Gang Wang

    We have developed a portable solar adaptive optics (PSAO) for diffraction-limited imaging based on today’s multi-core personal computer. Our PSAO software is written in LabVIEW code, which features block-diagram function based programming and can dramatically speed up the software development. The PSAO can achieve a ~1000 Hz open-loop correction speed with a Shack–Hartmann Wave-front Sensor (SH-WFS)

    更新日期:2020-04-24
  • The long-term optical activity of the propellers AE Aquarii and AR Scorpii
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-04-24
    Vojtěch Šimon

    This analysis of the long-term optical activity of the propellers AE Aqr and AR Sco uses data from the Catalina Real-time Transient Survey, DASCH, and AAVSO. The site and character of the emissions from the phenomena caused by the magnetic field of the white dwarf (WD) vary from system to system. The histogram of intensities of the ensemble of flares of AE Aqr suggests that the long-term activity consists

    更新日期:2020-04-24
  • Cluster formation induced by a cloud–cloud collision in [DBS2003]179
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-04-24
    Sho Kuwahara; Kazufumi Torii; Norikazu Mizuno; Shinji Fujita; Mikito Kohno; Yasuo Fukui

    [DBS2003]179 is a super star cluster in the Galaxy discovered in deep near-infrared observations. We carried out CO |$J$| = 1–0 and |$J$| = 3–2 observations of the region of [DBS2003]179 with NANTEN2, ASTE, and the Mopra 22 m telescope. We identified and mapped two molecular clouds that are likely to be associated with the cluster. This association is supported by the spatial correlation with the corresponding

    更新日期:2020-04-24
  • The First VERA Astrometry Catalog
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-04-24
    Tomoya Hirota; Takumi Nagayama; Mareki Honma; Yuuki Adachi; Ross A Burns; James O Chibueze; Yoon Kyung Choi; Kazuya Hachisuka; Kazuhiro Hada; Yoshiaki Hagiwara; Shota Hamada; Toshihiro Handa; Mao Hashimoto; Ken Hirano; Yushi Hirata; Takanori Ichikawa; Hiroshi Imai; Daichi Inenaga; Toshio Ishikawa; Takaaki Jike; Osamu Kameya; Daichi Kaseda; Jeong Sook Kim; Jungha Kim; Mi Kyoung Kim; Hideyuki Kobayashi;

    We present the first astrometry catalog from the Japanese VLBI (very long baseline interferometer) project VERA (VLBI Exploration of Radio Astrometry). We have compiled all the astrometry results from VERA, providing accurate trigonometric-annual-parallax and proper-motion measurements. In total, 99 maser sources are listed in the VERA catalog. Among them, 21 maser sources are newly reported, while

    更新日期:2020-04-24
  • TESS photometry of the eclipsing δ Scuti star AI Hydrae
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-04-24
    Jae Woo Lee; Kyeongsoo Hong; Martti H Kristiansen

    AI Hya has been known as an eclipsing binary with a monoperiodic |$\delta$| Sct pulsator. We present the results from its TESS (Transiting Exoplanet Survey Satellite) photometry observed during Sector 7. Including our five minimum epochs, the eclipse timing diagram displays the apsidal motion with a rate of |$\dot{\omega } = 0.075 \pm 0.031\:$|deg|$\:$|yr|$^{-1}$|⁠, which corresponds to an apsidal

    更新日期:2020-04-24
  • A possible origin of kilohertz quasi-periodic oscillations in low-mass X-ray binaries
    Publ. Astron. Soc. Jpn. (IF 5.024) Pub Date : 2020-04-20
    Shoji Kato; Mami Machida

    A possible origin of kilohertz quasi-periodic oscillations (QPOs) in low-mass X-ray binaries is proposed. Recent numerical magnetohydrodynamic simulations of accretion disks with turbulent magnetic fields of magneto-rotational instability definitely show the presence of two-armed spiral structure in the quasi-steady state of accretion disks. In such deformed disks, two-armed (⁠|$m=2$|⁠) c-mode (⁠|$n=1$|⁠)

    更新日期:2020-04-20
Contents have been reproduced by permission of the publishers.
导出
全部期刊列表>>
欢迎访问IOP中国网站
自然职场线上招聘会
GIANT
产业、创新与基础设施
自然科研线上培训服务
材料学研究精选
胸腔和胸部成像专题
屿渡论文,编辑服务
何川
苏昭铭
陈刚
姜涛
李闯创
北大
刘立明
隐藏1h前已浏览文章
课题组网站
新版X-MOL期刊搜索和高级搜索功能介绍
ACS材料视界
天合科研
x-mol收录
上海纽约大学
曾林
天津大学
何振宇
史大永
吉林大学
卓春祥
张昊
杨中悦
试剂库存
down
wechat
bug