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A Comparative Study of the Power-law Relationship between the Pulse width and Energy of Precursor and Main Burst Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-26 Hui-Ying Deng, Zhao-Yang Peng, Jia-Ming Chen, Dan Zhu
In gamma-ray burst prompt emission, there is still no consistent conclusion if the precursor and main burst share the same origin. In this paper, we try to study this issue based on the relationship between pulse width and energy of the precursor and main burst. We systematically search the light curve data observed by Swift/BAT and Fermi/GBM, and find 13 long bursts with well-structured precursors
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Confirmation of a Sub-Saturn-size Transiting Exoplanet Orbiting a G Dwarf: TOI-1194 b and a Very Low Mass Companion Star: TOI-1251 B from TESS Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-26 Jia-Qi Wang, Xiao-Jun Jiang, Jie Zheng, Hanna Kellermann, Arno Riffeser, Liang Wang, Karen A. Collins, Allyson Bieryla, Lars A. Buchhave, Steve B. Howell, Elise Furlan, Eric Girardin, Joao Gregorio, Eric Jensen, Felipe Murgas, Mesut Yilmaz, Sam Quinn, Xing Gao, Ruo-Yu Zhou, Frank Grupp, Hui-Juan Wang
We report the confirmation of a sub-Saturn-size exoplanet, TOI-1194 b, with a mass of about 0.456−0.051+0.055 M J, and a very low mass companion star with a mass of about 96.5 ± 1.5 M J, TOI-1251 B. Exoplanet candidates provided by the Transiting Exoplanet Survey Satellite (TESS) are suitable for further follow-up observations by ground-based telescopes with small and medium apertures. The analysis
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A Hierarchical Method for Locating the Interferometric Fringes of Celestial Sources in the Visibility Data Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-26 Rong Ma, Ruiqing Yan, Hanshuai Cui, Xiaochun Cheng, Jixia Li, Fengquan Wu, Zongyao Yin, Hao Wang, Wenyi Zeng, Xianchuan Yu
In source detection in the Tianlai project, locating the interferometric fringe in visibility data accurately will influence downstream tasks drastically, such as physical parameter estimation and weak source exploration. Considering that traditional locating methods are time-consuming and supervised methods require a great quantity of expensive labeled data, in this paper, we first investigate characteristics
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Rotating Massive Strangeon Stars and X-Ray Plateau of Short GRBs Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-21 Xi-Yan Yang, Xiao-Yu Lai, Wei-Wei Tan, Ren-Xin Xu
Strangeon stars, which are proposed to describe the nature of pulsar-like compact stars, have passed various observational tests. The maximum mass of a non-rotating strangeon star could be high, which implies that the remnants of binary strangeon star mergers could even be long-lived massive strangeon stars. We study rigidly rotating strangeon stars in the slowly rotating approximation, using the Lennard-Jones
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The Mass Assembly History for Galaxies with MaNGA Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-21 Xue Ge, Hong-Tao Wang, Cheng-Long Lei, Yun-Jun Guo, Yi-Long Jiang, Xiao-Xiao Cao
How galaxies assemble masses through their own star formation or interaction with the external environment is still an important topic in the field of galaxy formation and evolution. We use Value Added Catalogs with galaxy features that are spatially and temporally resolved from Sloan Digital Sky Survey Data Release 17 to investigate the mass growth histories of early-type galaxies (ETGs) and late-type
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An Analysis of the Fragmentation of Observing Time At the Muztagh-Ata Site Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-20 Wen-Bo Gu, Jing Xu, Guo-Jie Feng, Xuan Zhang, Le-Tian Wang, Xin-Liang Wang, Ali Esamdin, Li-Xian Shen
Cloud cover plays a pivotal role in assessing observational conditions for astronomical site-testing. Except for the fraction of observing time, its fragmentation also wields a significant influence on the quality of nighttime sky clarity. In this article, we introduce the function Γ∈0,1 , designed to comprehensively capture both the fraction of available observing time and its continuity. Leveraging
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The Radcliffe Wave Parameters from Data on Open Star Clusters Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-20 V. V. Bobylev, A. T. Bajkova
A spectral analysis of the vertical positions and velocities of 374 open star clusters (OSCs) was carried out. We took these OSCs from the Hunt and Reffert catalog; they have an average age of about 10 million years, and are located on the galactic plane XY in a narrow zone inclined by 25° to the galactic axis Y. The following estimates of the parameters of the Radcliffe wave were obtained: (a) the
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Dark Matter Search in Dwarf Irregular Galaxies with Ten Years of Data from the IceCube Neutrino Observatory Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-20 Yi-Fei Lü, Ben-Yang Zhu, Rong-Lan Li, Xue-Kang Guo, Tian-Ci Liu, Yong-Bo Huang, Yun-Feng Liang
Dwarf irregular galaxies (dIrrs), as rotationally supported systems, have more reliable J-factor measurements than dwarf spheroidal galaxies and have received attention as targets for dark matter detection in recent years. In this paper, we use 10 yr of IceCube muon-track data and an unbinned maximum-likelihood-ratio method to search for neutrino signals beyond the background from the directions of
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Gamma/Hadron Separation Method for the HADAR Experiment Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-20 Yang-Zhao Ren, Tian-Lu Chen, You-Liang Feng, Dan-Zeng Luo-Bu, Yi-Qing Guo, Cheng Liu, Qi Gao, Mao-Yuan Liu, Xiang-Li Qian, Ya-Ping Wang, Zi-Hao Zhang, Xin-Long Li, Qing-Yuan Hou, Heng-Jiao Liu, Qing-Qian Zhou, Shan-Jie Shu
Ground-based arrays of imaging atmospheric Cherenkov telescopes (IACTs) are the most sensitive γ-ray detectors for energies of approximately 100 GeV and above. One such IACT is the High Altitude Detection of Astronomical Radiation (HADAR) experiment, which uses a large aperture refractive water lens system to capture atmospheric Cherenkov photons (i.e., the imaging atmospheric Cherenkov technique)
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Large-aperture Telescope Tracking Control Based on Time-synchronization Strategy Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-20 Yun Li, Yu Ye, Shi-Hai Yang, Ling-Zhe Xu, Jin Xu, Hai Wang, Zhuang-Zhuang Deng, Rui-Qiang Liu, Xiao-Jie Gu, Bo-Zhong Gu
A time-synchronization strategy for packetized transmission of target position about a large-aperture telescope observation control system has been proposed in this study. Compared with the existing telescope tracking strategy, the target position packing and sending strategy based on the time synchronization method proposed in this paper has the advantages of high stability and reliability. First
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Comparing the Structural Parameters of the Milky Way to Other Spiral Galaxies Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-20 Jacob A. Guerrette, Aleksandr V. Mosenkov, Dallin Spencer, Zacory D. Shakespear
The structural parameters of a galaxy can be used to gain insight into its formation and evolution history. In this paper, we strive to compare the Milky Way’s structural parameters to other, primarily edge-on, spiral galaxies in order to determine how our Galaxy measures up to the Local Universe. For our comparison, we use the galaxy structural parameters gathered from a variety of literature sources
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Study of Type-B QPOs Observed in Black Hole X-Ray Binary Swift J1728.9-3613 Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-20 Raj Kumar
We report the detection of type-B quasi-periodic oscillation (QPO) of the black hole X-ray binary Swift J1728.9-3613 observed by NICER during the 2019 outburst. A type-B QPO was observed for the first two days and it disappeared as flux increased, but again appeared at ∼7.70 Hz when flux was dramatically decreased. The source was found in the soft intermediate state during these observations. We further
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The Impact of Bias Row Noise to Photometric Accuracy: Case Study Based on a Scientific CMOS Detector Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-08 Li Shao, Hu Zhan, Chao Liu, Haonan Chi, Qiuyan Luo, Huaipu Mu, Wenzhong Shi
We tested a new model of CMOS detector manufactured by the Gpixel Inc, for potential space astronomical application. In laboratory, we obtain some bias images under the typical application environment. In these bias images, clear random row noise pattern is observed. The row noise also contains some characteristic spatial frequencies. We quantitatively estimated the impact of this feature to photometric
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A New Method for Monitoring Scattered Stray Light of an Inner-occulted Coronagraph Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-07 Da-Yang Liu, Hong-Xin Zhang, Ming-Zhe Sun, Zheng-Hua Huang, Li-Dong Xia, Wei-Xin Liu, Hui Fu
The scattered stray light of a coronagraph is a type of stray light that is generated by the objective lens as its surface defects are irradiated by sunlight. The defects mainly include dust and blemishes on the lens surface, microroughness of the lens surface, and impurity and inhomogeneity of the glass. Unlike the other types of relatively stable defects introduced when the objective lens is being
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GRB 200612A: An Ultralong Gamma-Ray Burst Powered by Magnetar Spinning Down Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-07 Liang-Jun Chen, Xiang-Gao Wang, De-Long Yang, En-Wei Liang
GRB 200612A could be classified as an ultralong gamma-ray burst due to its prompt emission lasting up to ∼1020 s and the true timescale of the central engine activity t burst ≥ 4 × 104 s. The late X-ray light curve with a decay index of α = 7.53 is steeper than the steepest possible decay from an external shock model. We propose that this X-ray afterglow can be driven by dipolar radiation from the
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The Precursor of GRB211211A: A Tide-induced Giant Quake? Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-07 Enping Zhou, Yong Gao, Yurui Zhou, Xiaoyu Lai, Lijing Shao, Weiyang Wang, Shaolin Xiong, Renxin Xu, Shuxu Yi, Garvin Yim, Han Yue, Zhen Zhang
The equilibrium configuration of a solid strange star in the final inspiral phase with another compact object is generally discussed, and the starquake-related issue is revisited, for a special purpose to understand the precursor emission of binary compact star merger events (e.g., that of GRB211211A). As the binary system inspirals inward due to gravitational wave radiation, the ellipticity of the
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Lobe-dominated γ-Ray Emission of Compact Symmetric Objects Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-07 Ying-Ying Gan, Hai-Ming Zhang, Xing Yang, Ying Gu, Jin Zhang
The γ-ray emitting compact symmetric objects (CSOs) PKS 1718–649, NGC 3894, and TXS 0128+554 are lobe-dominated in the radio emission. In order to investigate their γ-ray radiation properties, we analyze the ∼14 yr Fermi/LAT observation data of the three CSOs. They all show the low luminosity (1041–1043 erg s−1) and no significant variability in the γ-ray band. Their γ-ray average spectra can be well
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The ALMA-QUARKS Survey. I. Survey Description and Data Reduction Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-02-02 Xunchuan Liu, Tie Liu, Lei Zhu, Guido Garay, Hong-Li Liu, Paul Goldsmith, Neal Evans, Kee-Tae Kim, Sheng-Yuan Liu, Fengwei Xu, Xing Lu, Anandmayee Tej, Xiaofeng Mai, Leonardo Bronfman, Shanghuo Li, Diego Mardones, Amelia Stutz, Ken’ichi Tatematsu, Ke Wang, Qizhou Zhang, Sheng-Li Qin, Jianwen Zhou, Qiuyi Luo, Siju Zhang, Yu Cheng, Jinhua He, Qilao Gu, Ziyang Li, Zhenying Zhang, Suinan Zhang, Anindya
This paper presents an overview of the QUARKS survey, which stands for “Querying Underlying mechanisms of massive star formation with ALMA-Resolved gas Kinematics and Structures.” The QUARKS survey is observing 139 massive clumps covered by 156 pointings at Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 (λ ∼ 1.3 mm). In conjunction with data obtained from the ALMA-ATOMS survey at Band 3
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The Clumpy Structure of Five Star-bursting Dwarf Galaxies in the MaNGA Survey Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Mengting Ju, Jun Yin, Lei Hao, Chenxu Liu, Chao-Wei Tsai, Junfeng Wang, Zhengyi Shao, Shuai Feng, Yu Rong
The star-forming clumps in star-bursting dwarf galaxies provide valuable insights into understanding the evolution of dwarf galaxies. In this paper, we focus on five star-bursting dwarf galaxies featuring off-centered clumps in the Mapping Nearby Galaxies at Apache Point Observatory survey. Using the stellar population synthesis software Fitting Analysis using Differential evolution Optimization, we
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Dreicer Electric Field Definition and Runaway Electrons in Solar Flares Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Yu. T. Tsap, A. V. Stepanov, Yu. G. Kopylova
We analyze electron acceleration by a large-scale electric field E in a collisional hydrogen plasma under the solar flare coronal conditions based on approaches proposed by Dreicer and Spitzer for the dynamic friction force of electrons. The Dreicer electric field E Dr is determined as a critical electric field at which the entire electron population runs away. Two regimes of strong (E ≲ E Dr) and
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Relations between the Fractional Variation of the Ionizing Continuum and C iv Broad Absorption Lines with Different Ionization Levels Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Ying-Ru Lin, Cai-Juan Pan, Wei-Jian Lu
This paper explores the correlation between the fractional variation of the ionizing continuum and C iv broad absorption lines (BALs) with different ionization levels. Our results reveal anti-correlations between fractional variation of the continuum and fractional equivalency width (EW) variation of the C iv BALs without Al iii BAL/mini-BALs at corresponding velocities, providing evidence for the
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Electromagnetic Ion Beam Instability in the Solar Corona Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Wen Liu, Jin-Song Zhao, De-Jin Wu, Huan-Yu Jia, Si-Ming Liu
Remote-sensing measurements indicate that heavy ions in the corona undergo an anisotropic and mass-charge dependent energization. A popular explanation to this phenomenon is the damping of the Alfvén/ion cyclotron waves. In this paper, we propose that the ion beam instability can be an important source of the Alfvén/ion cyclotron waves, and we study the excitation of the ion beam instability in the
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Analysis of Bright Source Hardness Ratios in the 4 yr Insight-HXMT Galactic Plane Scanning Survey Catalog Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Chen Wang, Jin-Yuan Liao, Ju Guan, Yuan Liu, Cheng-Kui Li, Na Sai, Jing Jin, Shuang-Nan Zhang
We conduct a statistical analysis of the hardness ratio (HR) for bright sources in the 4 yr Galactic Plane Scanning Survey catalog of Insight-HXMT. Depending on the stable (variable) flux F s (F v) or spectrum S s(S v) of each source, the bright sources are classified into three groups: F v&S v, F v&S s, and F s&S s. Our study of the HR characteristics in different types of sources reveals that accretion-powered
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Variation in the Flaring Potential of Different Sunspot Groups During Different Phases of Solar Cycles 23 and 24 Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Abha Singh, Anurag Chaudhari, Gyaneshwar Sharma, A. K. Singh
In this present study, we have analyzed different types of X-ray solar flares (C, M, and X classes) coming out from different classes of sunspot groups (SSGs). The data which we have taken under this study cover the duration of 24 yr from 1996 to 2019. During this, we observed a total of 15015 flares (8417 in SC-23 and 6598 in SC-24) emitted from a total of 33780 active regions (21746 in SC-23 and
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Free Energy of Anisotropic Strangeon Stars Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Shichuan Chen, Yong Gao, Enping Zhou, Renxin Xu
Can pulsar-like compact objects release further huge free energy besides the kinematic energy of rotation? This is actually relevant to the equation of state of cold supra-nuclear matter, which is still under hot debate. Enormous energy is surely needed to understand various observations, such as γ-ray bursts, fast radio bursts and soft γ-ray repeaters. In this paper, the elastic/gravitational free
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Variable Stars in the 50BiN Open Cluster Survey. III. NGC 884 Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Lin-Hong Wang, Qian-Heng Nie, Kun Wang, Xiao-Dian Chen, Chun-Guang Zhang, Li-Cai Deng, Xiao-Bin Zhang, Tian-Lu Chen
Open clusters are the basic building blocks that serve as a laboratory for the study of young stellar populations in the Milky Way. Variable stars in open clusters provide a unique way to accurately probe the internal structure, temporal and dynamical evolutionary stages of individual stars and the host cluster. The most powerful tool for such studies is time-domain photometric observations. This paper
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Period–Luminosity Relationship for δ Scuti Stars Revisited Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 Atila Poro, S. Javad Jafarzadeh, Roghaye Harzandjadidi, Mohammad Madani, Elnaz Bozorgzadeh, Esfandiar Jahangiri, Ahmad Sarostad, Ailar Alizadehsabegh, Maryam Hadizadeh, Mohammad EsmaeiliVakilabadi
The Gaia DR3 parallax approach was used to estimate the absolute parameters of 2375 δ Scuti stars from the ASAS catalog. The selected stars have a variety of observational characteristics, with a higher than 80% probability of being δ Scuti stars. We have displayed all the stars in the Hertzsprung–Russell diagram along with the δ Scuti instability strip, the Zero Age Main Sequence and the Terminal
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Data-driven Simulations of Magnetic Field Evolution in Active Region 11429: Magneto-frictional Method Using PENCIL CODE Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-31 P. Vemareddy, Jörn Warnecke, Ph. A. Bourdin
Coronal magnetic fields evolve quasi-statically over long timescales and dynamically over short timescales. As of now there exist no regular measurements of coronal magnetic fields, and therefore generating the coronal magnetic field evolution using observations of the magnetic field at the photosphere is a fundamental requirement to understanding the origin of transient phenomena from solar active
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Dealing with the Data Imbalance Problem in Pulsar Candidate Sifting Based on Feature Selection Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-24 Haitao Lin, Xiangru Li
Pulsar detection has become an active research topic in radio astronomy recently. One of the essential procedures for pulsar detection is pulsar candidate sifting (PCS), a procedure for identifying potential pulsar signals in a survey. However, pulsar candidates are always class-imbalanced, as most candidates are non-pulsars such as RFI and only a tiny part of them are from real pulsars. Class imbalance
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Time-resolved Spectral Properties of Fermi-GBM Bright Long Gamma-Ray Bursts Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-23 Wan-Kai Wang, Wei Xie, Zhi-Fu Gao, Shuo Xiao, Ai-Jun Dong, Bin Zhang, Qi-Jun Zhi
The prompt emission mechanism of gamma-ray bursts (GRBs) is still unclear, and the time-resolved spectral analysis of GRBs is a powerful tool for studying their underlying physical processes. We performed a detailed time-resolved spectral analysis of 78 bright long GRB samples detected by Fermi/Gamma-ray Burst Monitor. A total of 1490 spectra were obtained and their properties were studied using a
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Effect of Cosmic Plasma on the Observation of Supernovae Ia Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-23 Yi-Jia Zheng
In observational cosmology, a supernova Ia is used as a standard candle in order to extend the Hubble diagram to a higher redshift range. Astrophysicists found that the observed brightness of high redshift supernovae Ia is dimmer than expected. This dimming effect is considered observational evidence for the existence of dark energy in the universe. It should be noted that this conclusion is based
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Application of Regularization Methods in the Sky Map Reconstruction of the Tianlai Cylinder Pathfinder Array Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-23 Kaifeng Yu, Shifan Zuo, Fengquan Wu, Yougang Wang, Xuelei Chen
The Tianlai cylinder pathfinder is a radio interferometer array to test 21 cm intensity mapping techniques in the post-reionization era. It works in passive drift scan mode to survey the sky visible in the northern hemisphere. To deal with the large instantaneous field of view and the spherical sky, we decompose the drift scan data into m-modes, which are linearly related to the sky intensity. The
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A Fermi-LAT Study of Globular Cluster Dynamical Evolution in the Milky Way: Millisecond Pulsars as the Probe Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-23 Li Feng, Zhongqun Cheng, Wei Wang, Zhiyuan Li, Yang Chen
Using archival Fermi-LAT data with a time span of ∼12 yr, we study the population of Millisecond Pulsars (MSPs) in Globular Clusters (GlCs) and investigate their dependence on cluster dynamical evolution in the Milky Way. We show that the γ-ray luminosity (L γ ) and emissivity (i.e., ϵ γ = L γ /M, with M the cluster mass) are good indicators of the population and abundance of MSPs in GlCs, and they
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A Possible γ-Ray Pulsation from PSR J1740−5340B in the Globular Cluster NGC 6397 Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-17 Jiao Zheng, Pengfei Zhang, Li Zhang
Recently, a new radio millisecond pulsar (MSP) J1740−5340B, hosted in the globular cluster (GC) NGC 6397, was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a modified radio ephemeris updated by tool tempo2, we analyze the ∼15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR
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PSRDP: A Parallel Processing Method for Pulsar Baseband Data Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-16 Ya-Zhou Zhang, Hai-Long Zhang, Jie Wang, Xin-Chen Ye, Shuang-Qiang Wang, Xu Du, Han Wu, Ting Zhang, Shao-Cong Guo, Meng Zhang
To address the problem of real-time processing of ultra-wide bandwidth pulsar baseband data, we designed and implemented a pulsar baseband data processing algorithm (PSRDP) based on GPU parallel computing technology. PSRDP can perform operations such as baseband data unpacking, channel separation, coherent dedispersion, Stokes detection, phase and folding period prediction, and folding integration
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H i in High Gas-phase Metallicity Dwarf Galaxy WISEA J230615.06+143927.9 Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-15 Yan Guo, C. Sengupta, T. C. Scott, P. Lagos, Y. Luo
We present resolved Giant Metrewave Radio Telescope H i observations of the high gas-phase metallicity dwarf galaxy WISEA J230615.06+143927.9 (z = 0.005) (hereafter J2306) and investigate whether it could be a Tidal Dwarf Galaxy (TDG) candidate. TDGs are observed to have higher metallicities than normal dwarfs. J2306 has an unusual combination of a blue g − r color of 0.23 mag, irregular optical morphology
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Periodic Variation Studies of the Two Short Period W UMa-type Eclipsing Binaries: LX Lyn and V0853 Aur Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-15 Xu Zhang, Bin Zhang
In this paper, new light curves (LCs) of contact eclipsing binary (CEB) systems LX Lyn and V0853 Aur are presented and analyzed by using the 2015 version of the Wilson–Devinney (W-D) code. In order to explain their asymmetric LCs, cool starspots on the components were employed. It is suggested that their fill-out degrees are f = 12.0% (LX Lyn) and f = 26.3% (V0853 Aur). At the same time, we found that
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Simulation of RFI Cancellation Using Subspace Projection Algorithm for PAF Receiver Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-09 Peng Wu, Jian Li, Mao-Zheng Chen
The simulation of radio frequency interference (RFI) cancellation by applying a spatial filtering technique for phased array feed (PAF) is presented. In order to better reflect the characteristics of PAF, a new signal model is to add the coupling coefficient among elements of PAF to the conventional array signal model. Then the subspace projection (SP) algorithm is used to cancel RFI from the correlation
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The RFI Fast Mitigation Algorithm Based on Block LMS Filter Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-09 Han Wu, Hai-Long Zhang, Ya-Zhou Zhang, Jie Wang, Xu Du, Ting Zhang, Xin-Chen Ye
The radio telescope possesses high sensitivity and strong signal collection capabilities. While receiving celestial radiation signals, it also captures Radio Frequency Interferences (RFIs) introduced by human activities. RFI, as signals originating from sources other than the astronomical targets, significantly impacts the quality of astronomical data. This paper presents an RFI fast mitigation algorithm
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The Application of Permanent Magnet Synchronous Motor with Small Electrical Time Constant in Fiber Positioner Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-09 Shaoxiong Guo, Yan Yang, Yanbin Yin, Yihu Tang, Yang Tian, Chao Zhai
With the development of cutting-edge multi-object spectrographs, fiber positioners located in the focal plane are being scaled down in size, and miniature hollow-cup Permanent Magnet motors are now being considered as a suitable replacement for Faulhaber Precistep stepper motors. However, the small electrical time constant of such coreless motors poses a challenge, as the problem of severe commutation
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Investigating the Evolution of Amati Parameters with Redshift Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-09 Meghendra Singh, Darshan Singh, Kanhaiya Lal Pandey, Dinkar Verma, Shashikant Gupta
Gamma-ray bursts (GRBs) are among the brightest objects in the Universe and, hence, can be observed up to a very high redshift. Properly calibrated empirical correlations between intensity and spectral correlations of GRBs can be used to estimate the cosmological parameters. However, the possibility of the evolution of GRBs with redshift is a long-standing puzzle. In this work, we used 162 long-duration
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Low Surface Brightness Galaxies Selected by Different Model Fitting Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-09 Bing-Qing Zhang, Hong Wu, Wei Du, Pin-Song Zhao, Min He, Feng-Jie Lei
We present a study of low surface brightness galaxies (LSBGs) selected by fitting the images for all the galaxies in α.40 SDSS DR7 sample with two kinds of single-component models and two kinds of two-component models (disk+bulge): single exponential, single sérsic, exponential+deVaucular (exp+deV), and exponential+sérsic (exp+ser). Under the criteria of the B band disk central surface brightness μ0
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Spin Evolution of the Magnetar SGR J1935+2154 Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-09 Ming-Yu Ge, Yuan-Pei Yang, Fang-Jun Lu, Shi-Qi Zhou, Long Ji, Shuang-Nan Zhang, Bing Zhang, Liang Zhang, Pei Wang, Kejia Lee, Weiwei Zhu, Jian Li, Xian Hou, Qiao-Chu Li
Fast radio bursts (FRBs) are short pulses observed in radio frequencies usually originating from cosmological distances. The discovery of FRB 200428 and its X-ray counterpart from the Galactic magnetar SGR J1935+2154 suggests that at least some FRBs can be generated by magnetars. However, the majority of X-ray bursts from magnetars are not associated with radio emission. The fact that only in rare
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A Rendezvous Mission to the Second Earth Trojan Asteroid 2020 XL5 with Low-Thrust Multi-Gravity Assist Techniques Res. Astron. Astrophys. (IF 1.8) Pub Date : 2024-01-09 Shi-Hai Yang, Bo Xu, Xin Li
As the second of Earth’s Trojan asteroids, 2020 XL5 is worthy of rendezvous and even sample return missions in many aspects. In this paper, a rendezvous mission to Earth’s second Trojan asteroid 2020 XL5 is proposed. However, due to its high inclination and large eccentricity, direct impulsive transfer requires large amounts of fuel consumption. To address this challenge, we explore the benefits of
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Summary of a Life in Observational Ultraviolet/Optical Astronomy Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-29 Donald G. York
I reminisce on my early life in Section 1; on my education in Sections 2 and 3; on the years at Princeton as a research astronomer in Section 4; on the years on the faculty at Chicago in Section 5; on research on Diffuse Interstellar Bands (DIBs) in Section 6; on construction of the 3.5 m telescope at Apache Point Observatory (APO) in Section 7; on work on the Sloan Digital Sky Survey (SDSS) in Section
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Design and Cryogenic Performance of a Hexapod Platform for a Large Ground-based Wide Field Survey Telescope Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-20 Yang Yu, Xue-Wen Wang, Yu Zhang, Jia-Lin Sun, Zhen-Bang Xu, Jian-Li Wang
The thermal gradient is an important factor that causes degradation to the image quality of telescopes. In order to ensure the accurate alignment of the primary focus unit and the primary mirror, the hexapod platform (as a corrector) is investigated in this paper. First, a ground-based telescope with 2.5 m aperture and 3.5 deg field of view is described. The telescope is under construction, and it
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Study on the Performance of the GRANDProto300 Particle Detector Array by Simulation Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-19 Fu-Lin Dai, Quan-Bu Gou, Xiaoyuan Huang, Yi-Qing Guo
The Giant Radio Array for Neutrino Detection (GRAND) is a proposed large-scale observatory designed to detect cosmic rays, gamma-rays, and neutrinos with energies exceeding 100 PeV. The GRANDProto300 experiment is proposed as the early stage of the GRAND project, consisting of a hybrid array of radio antennas and scintillator detectors. The latter, as a mature and traditional detector, is used to cross-check
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Point-symmetry in SNR G1.9+0.3: A Supernova that Destroyed its Planetary Nebula Progenitor Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-19 Noam Soker
I analyze a new X-ray image of the youngest supernova remnant (SNR) in the Galaxy, which is the type Ia SNR G1.9+0.3, and reveal a very clear point-symmetrical structure. Since explosion models of type Ia supernovae (SNe Ia) do not form such morphologies, the point-symmetrical morphology must come from the circumstellar material (CSM) into which the ejecta expands. The large-scale point-symmetry that
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On the Identification of N-rich Metal-poor Field Stars with Future Chinese Space Station Telescope Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-18 Jiajun Zhang, Baitian Tang, Jiang Chang, Xiangxiang Xue, José G. Fernández-Trincado, Chengyuan Li, Long Wang, Hao Tian, Yang Huang
During the long term evolution of globular clusters (GCs), some member stars are lost to the field. The recently found nitrogen-rich (N-rich) metal-poor field stars are promising candidates of these GC escapees, since N enhancement is the fingerprint of chemically enhanced populations in GCs. In this work, we discuss the possibility of identifying N-rich metal-poor field stars with the upcoming Chinese
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Disturbance Observer-based Pointing Control of Leighton Chajnantor Telescope Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-13 Weirui Chen, Zheng Wang
Leighton Chajnantor Telescope (LCT), i.e., the former Caltech Submillimeter Observatory telescope, will be refurbished at the new site in Chajnantor Plateau, Chile in 2023. The environment of LCT will change significantly after its relocation, and the telescope will be exposed to large wind disturbances directly because its enclosure will be completely open during observation. The wind disturbance
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Implications of the Stellar Mass Density of High-z Massive Galaxies from JWST on Warm Dark Matter Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-13 Hengjie Lin, Yan Gong, Bin Yue, Xuelei Chen
A significant excess of the stellar mass density at high redshift has been discovered from the early data release of James Webb Space Telescope (JWST), and it may require a high star formation efficiency. However, this will lead to large number density of ionizing photons in the epoch of reionization (EoR), so that the reionization history will be changed, which can arise tension with the current EoR
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A Cross-matching Service for Data Center of Xinjiang Astronomical Observatory Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-13 Hai-Long Zhang, Jie Wang, Xin-Chen Ye, Wan-Qiong Wang, Jia Li, Ya-Zhou Zhang, Xu Du, Han Wu, Ting Zhang
Cross-matching is a key technique to achieve fusion of multi-band astronomical catalogs. Due to different equipment such as various astronomical telescopes, the existence of measurement errors, and proper motions of the celestial bodies, the same celestial object will have different positions in different catalogs, making it difficult to integrate multi-band or full-band astronomical data. In this
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Quantitative Analysis of Seeing with Height and Time at Muztagh-Ata Site Based on ERA5 Database Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-13 Xiao-Qi Wu, Cun-Ying Xiao, Ali Esamdin, Jing Xu, Ze-Wei Wang, Luo Xiao
Seeing is an important index to evaluate the quality of an astronomical site. To estimate seeing at the Muztagh-Ata site with height and time quantitatively, the European Centre for Medium-Range Weather Forecasts reanalysis database (ERA5) is used. Seeing calculated from ERA5 is compared consistently with the Differential Image Motion Monitor seeing at the height of 12 m. Results show that seeing decays
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Early Phases of Star Formation: Testing Chemical Tools Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-12 N. C. Martinez, S. Paron
Star-forming processes strongly influence the ISM chemistry. Nowadays, many high-quality databases are available at millimeter wavelengths. Using them, it is possible to carry out studies that review and deepen previous results. If these studies involve large samples of sources, it is preferred to use direct tools to study the molecular gas. With the aim of testing these tools such as the use of the
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Radiation Spectral Analysis of 3D Dust Molecular Clusters (PAHs) and Peptoids under Ionization and Electric Field in ISM Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-12 Ruiqing Wu, Chunhua Zhu, Guoliang Lü, Xiaojiao Zhang, Xizhen Lu, Jinlong Yu, Wujin Chen, Mengqiu Long
Polycyclic aromatic hydrocarbons (PAHs), PANHs, and peptoids dust spectral calculations from the interstellar medium (ISM) are important for dust observations and theory. Our goal is to calculate the radiation spectrum of spherical PAHs dust clusters in a vacuum containing ionized and applied in the presence of an electric field. We propose a new simple computational model to calculate the size of
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Observation and Analysis of VLF Nocturnal Multimode Interference Phenomenon based on Waveguide Mode Theory Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-12 Sai Yang, You-Tian Niu, Zhe Wang, Xiu-Kun Zhao, Bei Li, Yu-Ling Ding, Ge-Ge Zhao, An-Qi Zhang
Very low frequency (VLF) signals are propagated between the ground-ionosphere. Multimode interference will cause the phase to show oscillatory changes with distance while propagating at night, leading to abnormalities in the received VLF signal. This study uses the VLF signal received in Qingdao City, Shandong Province, from the Russian Alpha navigation system to explore the multimode interference
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Basic Survey Scheduling for the Wide Field Survey Telescope (WFST) Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-12 Yan-Peng Chen, Ji-An Jiang, Wen-Tao Luo, Xian-Zhong Zheng, Min Fang, Chao Yang, Yuan-Yu Hong, Zong-Fei Lü
Aiming at improving the survey efficiency of the Wide Field Survey Telescope, we have developed a basic scheduling strategy that takes into account the telescope characteristics, observing conditions, and weather conditions at the Lenghu site. The sky area is divided into rectangular regions, referred to as “tiles,” with a size of 2.°577 × 2.°634 slightly smaller than the focal area of the mosaic CCDs
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Formation of a Rapidly Rotating Classical Be-star in a Massive Close Binary System Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-12 Evgeny Staritsin
This paper investigates the spin-up of a mass-accreting star in a close binary system passing through the first stage of mass exchange in the Hertzsprung gap. Inside an accreting star, angular momentum is carried by meridional circulation and shear turbulence. The circulation carries part of the angular momentum of the accreted layers to the accretor’s surface. The greater the rate of arrival of angular
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Two-dimensional Parameter Relationships for W UMa-type Systems Revisited Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-12-12 Atila Poro, Ehsan Paki, Ailar Alizadehsabegh, Mehdi Khodadadilori, Selda Ranjbar Salehian, Mahya Hedayatjoo, Fatemeh Hashemi, Yasaman Dashti, Fatemeh Mohammadizadeh
Reviewing the empirical and theoretical parameter relationships between various parameters is a good way to understand more about contact binary systems. In this investigation, two-dimensional (2D) relationships for P–M V(system), P–L 1,2, M 1,2–L 1,2, and q–L ratio were revisited. The sample used is related to 118 contact binary systems with an orbital period shorter than 0.6 days whose absolute parameters
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Constraining the Orbital Inclination and Companion Properties of Three Black Widow Pulsars Detected by FAST Res. Astron. Astrophys. (IF 1.8) Pub Date : 2023-11-28 Ze-Xin Du, Yun-Wei Yu, A-Ming Chen, Shuang-Qiang Wang, Xia Zhou, Xiao-Ping Zheng
Black widows (BWs) are millisecond pulsars ablating their companion stars. The out-flowing material from the companion can block the radio emission of the pulsar, resulting in eclipses. In this paper, we construct a model for the radio eclipse by calculating the geometry of the bow shock between the winds of the pulsar and companion, where the shock shapes the eclipsing medium but had not been described