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  • Searching for misaligned active galactic nuclei among blazar candidates in the Fourth Fermi-LAT catalog
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-08-05
    Graziano Chiaro, Giovanni La Mura, Alberto Domínguez, Susanna Bisogni

    Radio-loud sources with blazar-like properties, but having a jet that does not directly point in the direction of the observer are among the most interesting classes of γ-ray emitters. These sources are known as Misaligned Active Galactic Nuclei (MAGN). Understanding MAGN properties is useful to improve the knowledge of blazar energetics. We searched for new MAGN candidates among the remaining blazars

    更新日期:2020-08-05
  • Neutron star equation of state: Exemplary modeling and applications
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-07-29
    A. Li; Z.-Y. Zhu; E.-P. Zhou; J.-M. Dong; J.-N. Hu; C.-J. Xia

    Because of the development of many-body theories of nuclear matter, the long-standing, open problem of the equation of state (EOS) of dense matter may be understood in the near future through the confrontation of theoretical calculations with laboratory measurements of nuclear properties & reactions and increasingly accurate observations in astronomy. In this review, we focus on the following six aspects:

    更新日期:2020-07-29
  • In-flight calibration of the Insight-Hard X-ray Modulation Telescope
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-06-16
    Xiaobo Li, Xufang Li, Ying Tan, Yanji Yang, Mingyu Ge, Juan Zhang, Youli Tuo, Baiyang Wu, Jinyuan Liao, Yifei Zhang, Liming Song, Shu Zhang, Jinlu Qu, Shuang-nan Zhang, Fangjun Lu, Yupeng Xu, Congzhan Liu, Xuelei Cao, Chengkui Li

    We present the calibration of the Insight-Hard X-ray Modulation Telescope (Insight-HXMT) X-ray satellite, which can be used to perform timing and spectral studies of bright X-ray sources. Insight-HXMT carries three main payloads onboard: the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME) and the low Energy X-ray telescope (LE). In orbit, the radioactive sources, activated

    更新日期:2020-06-16
  • The background model of the medium energy X-ray telescope of Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-06-02
    Cheng-Cheng Guo, Jin-Yuan Liao, Shu Zhang, Juan Zhang, Ying Tan, Li-Ming Song, Fang-Jun Lu, Xue-Lei Cao, Zhi Chang, Yu-Peng Chen, Yuan-Yuan Du, Ming-Yu Ge, Yu-Dong Gu, Wei-Chun Jiang, Jing Jin, Gang Li, Xian Li, Xiao-Bo Li, Shuang-Nan Zhang

    The Medium Energy X-ray Telescope (ME) is one of the main payloads of the Hard X-ray Modulation Telescope (dubbed as Insight-HXMT). The background of Insight-HXMT/ME is mainly caused by the environmental charged particles and the background intensity is modulated remarkably by the geomagnetic field, as well as the geographical location. At the same geographical location, the background spectral shape

    更新日期:2020-06-02
  • The lifetime of binary neutron star merger remnants
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-06-02
    Matteo Lucca, Laura Sagunski

    Although the main features of the evolution of binary neutron star systems are now well established, many details are still subject to debate, especially regarding the post-merger phase. In particular, the lifetime of the hyper-massive neutron stars formed after the merger is very hard to predict. In this work, we provide a simple analytic relation for the lifetime of the merger remnant as function

    更新日期:2020-06-02
  • Insight-HXMT insight into switch of the accretion mode: The case of the X-ray pulsar 4U 1901+03
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-06-01
    Y.L. Tuo, L. Ji, S.S. Tsygankov, T. Mihara, L.M. Song, M.Y. Ge, A. Nabizadeh, L. Tao, J.L. Qu, Y. Zhang, S. Zhang, S.N. Zhang, Q.C. Bu, L. Chen, Y.P. Xu, X.L. Cao, Y. Chen, C.Z. Liu, R.L. Zhuang

    We use the Insight-HXMT data collected during the 2019 outburst from X-ray pulsar 4U 1901+03 to complement the orbital parameters reported by Fermi/GBM. Using the Insight-HXMT, we examine the correlation between the derivative of the intrinsic spin frequency and bolometric flux based on accretion torque models. It was found that the pulse profiles significantly evolve during the outburst. The existence

    更新日期:2020-06-01
  • Background model for the Low-Energy Telescope of Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-05-27
    Jin-Yuan Liao, Shu Zhang, Yong Chen, Juan Zhang, Jing Jin, Zhi Chang, Yu-Peng Chen, Ming-Yu Ge, Cheng-Cheng Guo, Gang Li, Xiao-Bo Li, Fang-Jun Lu, Xue-Feng Lu, Jian-Yin Nie, Li-Ming Song, Yan-Ji Yang, Yuan You, Hai-Sheng Zhao, Shuang-Nan Zhang

    With more than 150 blank sky observations at high Galactic latitude, we make a systematic study to the background of the Low Energy Telescope (LE) of the Hard X-ray Modulation Telescope (dubbed as Insight-HXMT). Both the on-ground simulation and the in-orbit observation indicate that the background spectrum mainly has two components. One is the particle background that dominates above 7 keV and its

    更新日期:2020-05-27
  • Background model for the high-energy telescope of Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-05-27
    Jin-Yuan Liao, Shu Zhang, Xue-Feng Lu, Juan Zhang, Gang Li, Zhi Chang, Yu-Peng Chen, Ming-Yu Ge, Cheng-Cheng Guo, Rui Huang, Jing Jin, Xiao-Bo Li, Xu-Fang Li, Zheng-Wei Li, Cong-Zhan Liu, Fang-Jun Lu, Jian-Yin Nie, Li-Ming Song, Shuang-Nan Zhang

    Accurate background estimation is essential for spectral and temporal analysis in astrophysics. In this work, we construct the in-orbit background model for the High-Energy Telescope (HE) of the Hard X-ray Modulation Telescope (dubbed as Insight-HXMT). Based on the two-year blank sky observations of Insight-HXMT/HE, we first investigate the basic properties of the background and find that both the

    更新日期:2020-05-27
  • Calibration of the instrumental response of Insight-HXMT/HE CsI detectors for gamma-ray monitoring
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-05-27
    Qi Luo, Jin-Yuan Liao, Xu-Fang Li, Gang Li, Juan Zhang, Cong-Zhan Liu, Xiao-Bo Li, Yue Zhu, Cheng-Kui Li, Yue Huang, Ming-Yu Ge, Yu-Peng Xu, Zheng-Wei Li, Ce Cai, Shuo Xiao, Qi-Bin Yi, Yi-Fei Zhang, Shao-Lin Xiong, Shuang-Nan Zhang

    The CsI detectors of the High Energy X-ray Telescope of the Hard X-ray Modulation Telescope (HXMT/CsI) can be used for gamma-ray all sky monitoring and searching for the electromagnetic counterpart of gravitational wave source. The instrumental responses are mainly obtained by Monte Carlo simulation with the Geant4 tool and the mass model of both the satellite and all the payloads, which is updated

    更新日期:2020-05-27
  • The observation of the South Atlantic Anomaly with the particle monitors onboard Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-05-04

    The South Atlantic Anomaly (SAA) is a region of weakened geomagnetic field and in the previous studies, it shows a secular variation with time which is associated with the changing of the magnetic moment. This region also consists of large amounts of energetic charged particles and is danger to space vehicle and astronauts. Thus, it is essential to know the location and movement of the SAA. In this

    更新日期:2020-05-04
  • Scientific prospects for a mini-array of ASTRI telescopes: A γ-ray TeV data challenge
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-05-04
    F. Pintore, A. Giuliani, A. Belfiore, A. Paizis, S. Mereghetti, N. La Palombara, S. Crestan, L. Sidoli, S. Lombardi, A. D'Aì, F.G. Saturni, P. Caraveo, A. Burtovoi, M. Fiori, C. Boccato, A. Caccianiga, A. Costa, G. Cusumano, L. Tibaldo

    ASTRI is a project aiming at the realization of a γ-ray imaging Cherenkov telescope that observes the sky in the TeV band. Recently, the development of a mini-array (MA) of ASTRI telescopes has been funded by the Istituto Nazionale di Astrofisica. The ASTRI Comprehensive Data Challenge (ACDC) project aims at optimizing the scientific exploitation and analysis techniques of the ASTRI MA, by performing

    更新日期:2020-05-04
  • Confirming the spin parameter of the black hole in Cygnus X-1 using the Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-05-04
    Xue-Shan Zhao, Yan-Ting Dong, Li-Jun Gou, Ye Feng, Nan Jia, Yu-Feng Li, Zhen-Xuan Liao, Ji-Ren Liu, Xue-Ying Zheng, Shuang-Nan Zhang, Jin-Lu Qu, Li-Ming Song, Shu Zhang, Qing-Cui Bu, Ce Cai, Xue-Lei Cao, Zhi Chang, Gang Chen, Ren-Lin Zhuang

    Recently, the system parameters of Cygnus X-1, i.e., the black hole mass M, the orbital inclination i and the source distance D, have been updated. As the input constraints of the continuum-fitting method, it is necessary to refine the spin with these new parameters. The Hard X-ray Modulation Telescope (HXMT, also named Insight) was successfully launched on June 15th, 2017 in China. In this work, we

    更新日期:2020-05-04
  • Gamma-ray and optical properties of the flat spectrum radio quasar 3C 279 flare in June 2015
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-03-05
    K.K. Singh, P.J. Meintjes, B. Bisschoff, F.A. Ramamonjisoa, B. van Soelen

    The flat spectrum radio quasar 3C 279 was observed in an extremely high activity state on June 16, 2015 (MJD 57189). In this paper, we investigate the properties of this flaring episode in the high energy γ-ray and optical bands using data from the Fermi-LAT, SMARTS, and SPOL observations during the period June 1-30, 2015 (MJD 57174-57203). The highest emission state in the γ-ray band detected by the

    更新日期:2020-03-05
  • Multi-wavelength observations of the BL Lac object Fermi J1544-0649: One year after its awakening
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-02-25
    P.H.T. Tam, P.S. Pal, Y.D. Cui, N. Jiang, Y. Sotnikova, C.W. Yang, L.Z. Wang, B.T. Tang, Y.B. Li, J. Mao, A.K.H. Kong, Z.H. Zhong, J. Ding, T. Mufakharov, J.F. Fan, L.M. Dou, R.F. Shen, Y.L. Ai

    We report observations of a transient source Fermi J1544-0649 from radio to γ-rays. Fermi J1544-0649 was discovered by the Fermi-LAT in May 2017. Follow-up Swift-XRT observations revealed three flaring episodes through March 2018, and the peak X-ray flux is about 103 higher than the ROSAT all-sky survey (RASS) flux upper limit. Optical spectral measurements taken by the Magellan 6.5-m telescope and

    更新日期:2020-02-25
  • Methodology and performance of the two-year galactic plane scanning survey of Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-02-24
    Na Sai, Jin-Yuan Liao, Cheng-Kui Li, Ju Guan, Chen Wang, Yi Nang, Yuan Liu, Cheng-Cheng Guo, Shu Zhang, Shuang-Nan Zhang

    The Galactic plane scanning survey is one of the main scientific objectives of the Hard X-ray Modulation Telescope (known as Insight-HXMT). During the two-year operation of Insight-HXMT, more than 1000 scanning observations have been performed and the whole Galactic plane (0∘

    更新日期:2020-02-24
  • A modified direct demodulation method applied to Insight-HXMT Galactic plane scanning survey
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-02-24
    Ju Guan, Fang-Jun Lu, Shu Zhang, Li-Ming Song, Yong Chen, Jin-Yuan Liao, Cheng-Kui Li, Yi Nang, Na Sai, Chen Wang, Shuang-Nan Zhang

    We present a modified direct demodulation (DD) method for the detection of fast variable objects with the Insight-HXMT Galactic plane survey, which is dedicated to hunting for new transients and monitoring known variable sources. The novelty of the improved DD method is the reconstruction of the modified response matrix, in which the variability of a source is properly handled. Monte Carlo (MC) simulation

    更新日期:2020-02-24
  • Dark matter stars from beyond General Relativity models: Magnetosphere dynamics and torsion fields
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-02-24
    D.J. Cirilo-Lombardo

    The magnetosphere structure of compact objects is considered in the context of a theory of gravity with dynamical torsion field beyond standard General Relativity (GR) introduced previously in Cirilo-Lombardo and Minotti (2019). To this end, a new spherically symmetric solution is obtained. A particular case physically representing a compact object of pseudoscalar fields (for example, axion field)

    更新日期:2020-02-24
  • Design and calibration of the high energy particle monitor onboard the Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-02-24
    Xuefeng Lu, Congzhan Liu, Xiaobo Li, Yifei Zhang, Zhengwei Li, Aimei Zhang, Shuang-Nan Zhang, Shu Zhang, Gang Li, Xufang Li, Fangjun Lu, Yupeng Xu, Zhi Chang, Fan Zhang

    Three high energy particle monitors (HPMs) employed onboard the Hard X-ray Modulation Telescope (Insight-HXMT) can detect the charged particles from South Atlantic Anomaly (SAA) and hence provide the alert trigger for switch-on/off of the main detectors. Here a typical design of HPM with high stability and reliability is adopted by taking a plastic scintillator coupled with a small photomultiplier

    更新日期:2020-02-24
  • Deadtime calculation method of the High Energy X-ray telescope (HE) onboard the Insight-HXMT satellite
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-02-22
    S. Xiao, S.L. Xiong, C.Z. Liu, X.B. Li, S.N. Zhang, M.Y. Ge, C. Cai, Q.B. Yi, Y. Zhu, W. Chen, X.F. Li, B. Li, L.M. Song, C.K. Li, X.Y. Song, Z. Chang, G.H. Gao, H. Gao, Y.F. Zhang

    Deadtime is the time period during which a detector processes the previous photon event and any later events will be ignored, thus the calculation of deadtime is of great importance to reconstruct the incident photon flux from the recorded counts. The High Energy X-ray telescope (HE) on-board the Insight-HXMT satellite records the deadtime only for a fixed time bin (i.e. 1 s), therefore it is impossible

    更新日期:2020-02-22
  • Joint analysis of energy and RMS spectra from MAXI J1535-571 with Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-01-23

    A new black hole X-ray binary (BHXRB) MAXI J1535-571 was discovered by MAXI during its outburst in 2017. Using observations taken by the first Chinese X-ray satellite, the Hard X-ray Modulation Telescope (dubbed as Insight-HXMT), we perform a joint spectral analysis (2-150 keV) in both energy and time domains. The energy spectra provide the essential input for probing the intrinsic Quasi-Periodic Oscillation

    更新日期:2020-01-23
  • In-orbit calibration to the point-spread function of Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-01-23
    Yi Nang, Jin-Yuan Liao, Na Sai, Chen Wang, Ju Guan, Cheng-Kui Li, Cheng-Cheng Guo, Yuan Liu, Jing Jin, Xiao-Bo Li, Shu Zhang, Shuang-Nan Zhang

    We make the in-orbit calibration to the point-spread functions (PSFs) of the collimators of the Hard X-ray Modulation Telescope with the scanning observation of the Crab. We construct the empirical adjustments to the theoretically calculated geometrical PSFs. The adjustments contain two parts: a rotating matrix to adjust the directional deviation of the collimators and a paraboloidal function to correct

    更新日期:2020-01-23
  • Toward a robust inference method for the likelihood of low-luminosity gamma-ray bursts to be progenitors of ultrahigh-energy cosmic rays correlating with starburst galaxies
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2020-01-22
    Luis A. Anchordoqui, Claire Mechmann, Jorge F. Soriano

    Very recently, the Pierre Auger Collaboration reported a 4.5σ correlation between the arrival directions of the highest energy cosmic rays and nearby starburst galaxies. The cosmic rays producing the anisotropy signal have been proposed to originate in low-luminosity gamma-ray bursts (llGRBs). On the basis of the well-justified assumption that at redshift z<0.3 the host metallicity is a good indicator

    更新日期:2020-01-22
  • Can we detect PeV neutrinos from merging black hole binaries?
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-12-30
    Xin-Yue Shi, Ye-Fei Yuan

    In the environment of a newly formed black hole, even small amounts of plasma can support a strong magnetic field up to 1011 G in a short time, and protons could be accelerated to ∼1017 eV which is limited by the curvature radiation. In the most optimistic estimation which consider no curvature cooling during the acceleration of protons, the maximum proton energy might be up to ∼1020 eV. After acceleration

    更新日期:2019-12-30
  • Diagnostic of the spectral properties of Aquila X-1 by Insight-HXMT snapshots during the early propeller phase
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-12-30
    C. Güngör, M.Y. Ge, S. Zhang, A. Santangelo, S.N. Zhang, F.J. Lu, Y. Zhang, Y.P. Chen, L. Tao, Y.J. Yang, Q.C. Bu, C. Cai, X.L. Cao, Z. Chang, G. Chen, L. Chen, T.X. Chen, Y. Chen, Y.X. Zhu

    We study the 2018 outburst of Aql X-1 via the monitor of all sky X-ray image (MAXI) data. We show that the outburst starting in February 2018 is a member of short-low class in the frame of outburst duration and the peak count rate although the outburst morphology is slightly different from the other fast-rise-exponential-decay (FRED) type outbursts with a milder rising stage. We study the partial accretion

    更新日期:2019-12-30
  • Insight-HXMT study of the timing properties of Sco X-1
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-12-28

    We present a detailed timing study of the brightest persistent X-ray source Sco X-1 using the data collected by the Hard X-ray Modulation Telescope (Insight-HXMT) from July 2017 to August 2018. A complete Z-track hardness-intensity diagram (HID) is obtained. The normal branch oscillations (NBOs) at ∼ 6 Hz in the lower part of the normal branch (NB) and the flare branch oscillations (FBOs) at ∼ 16 Hz

    更新日期:2019-12-28
  • Phase-resolved gamma-ray spectroscopy of the Crab pulsar observed by POLAR
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-10-11
    Han-Cheng Li, Neal Gauvin, Ming-Yu Ge, Merlin Kole, Zheng-Heng Li, Nicolas Produit, Li-Ming Song, Jian-Chao Sun, Jacek Szabelski, Teresa Tymieniecka, Yuan-Hao Wang, Bo-Bing Wu, Xin Wu, Shao-Lin Xiong, Shuang-Nan Zhang, Yong-Jie Zhang, Shi-Jie Zheng

    The POLAR detector is a space based Gamma-Ray Burst (GRB) polarimeter sensitive in the 15-500 keV energy range. Apart from its main scientific goal as a Gamma-Ray Burst polarimeter it is also able to detect photons from pulsars in orbit. By using the six-months in-orbit observation data, significant pulsation from the PSR B0531+21 (Crab pulsar) was obtained. In this work, we present the precise timing

    更新日期:2019-10-11
  • Ground-based calibration and characterization of the HE detectors for Insight-HXMT
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-10-10
    XuFang Li, CongZhan Liu, Zhi Chang, YiFei Zhang, XiaoBo Li, He Gao, ZhengWei Li, XueFeng Lu, Xu Zhou, AiMei Zhang, Tong Zhang, FangJun Lu, YuPeng Xu, ShuangNan Zhang, TiPei Li, Mei Wu, Shu Zhang, HongWei Liu, XiangPing Qiu

    High energy X-ray telescope (HE) is one of the three instruments of Insight-HXMT (Hard X-ray Modulation Telescope) payload. The HE detector (HED) array is composed of 18 actively NaI(Tl)/CsI(Na) phoswich scintillators with a total geometric area of ∼5100cm2 and cover the energy range 20∼250 keV. In this paper we describe the on-ground detector-level calibration campaigns and present the principal instrument

    更新日期:2019-10-10
  • Timing analysis of Swift J1658.2–4242's outburst in 2018 with Insight-HXMT, NICER and AstroSat
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-10-10
    G.C. Xiao, Yu Lu, X. Ma, M.Y. Ge, L.L. Yan, Z.J. Li, Y.L. Tuo, Y. Zhang, W. Zhang, H.X. Liu, D.K. Zhou, L. Zhang, Q.C. Bu, X.L. Cao, W.C. Jiang, Y.P. Chen, S. Zhang, F.J. Lu, Y.J. Jin

    We present the observational results from a detailed timing analysis of the black hole candidate Swift J1658.2–4242 during its 2018 outburst with the observations of Hard X-ray Modulation Telescope (Insight-HXMT), Neutron Star Interior Composition Explorer (NICER) and AstroSat in 0.1–250 keV. The evolution of intensity, hardness and integrated fractional root mean square (rms) observed by Insight-HXMT

    更新日期:2019-10-10
  • Detectability of neutron star — White dwarf coalescences by eROSITA and ART-XC
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-10-09
    A.D. Khokhriakova, S.B. Popov

    Coalescences of neutron stars and white dwarfs are relatively frequent phenomena, outnumbering other types of compact object mergers (neutron stars and black holes without involving white dwarfs) altogether. Such event potentially can produce not only optical, but also an X-ray burst. Transient source CDF-S XT2 (Xue et al., 2019) can be an example of this type of events as suggested by Fernández et

    更新日期:2019-10-09
  • Insight-HXMT observation on 4U 1608–52: Evolving spectral properties of a bright type-I X-ray burst
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-10-09
    Y.P. Chen, S. Zhang, S.N. Zhang, L. Ji, L.D. Kong, A. Santangelo, J.L. Qu, F.J. Lu, T.P. Li, L.M. Song, Y.P. Xu, X.L. Cao, Y. Chen, C.Z. Liu, Q.C. Bu, C. Cai, Z. Chang, G. Chen, Y.X. Zhu

    The evidences for the influence of thermonuclear (type-I) X-ray bursts upon the surrounding environments in neutron star low-mass X-ray binaries (LMXB) were detected previously via spectral and timing analyses. Benefitting from a broad energy coverage of Insight-HXMT, we analyze one photospheric radius expansion (PRE) burst, and find an emission excess at soft X-rays. Our spectral analysis shows that

    更新日期:2019-10-09
  • Studies on the time response distribution of Insight-HXMT/LE
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-10-09
    Xiao-Fan Zhao, Yu-Xuan Zhu, Da-Wei Han, Wei-Wei Cui, Wei Li, Juan Wang, Yu-Sa Wang, Yi Zhang, Yan-Ji Yang, Bo Lu, Jia Huo, Zi-Liang Zhang, Tian-Xiang Chen, Mao-Shun Li, Zhong-Hua Lv, Yong Chen

    The Hard X-ray Modulation Telescope (HXMT) named Insight is China's first X-ray astronomical satellite, with the Low Energy X-ray Telescope (LE) as one of its main payloads onboard. The detectors of LE adopt swept charge device CCD236 using L-shaped transfer electrodes. To measure the time response distribution resulted from the continuous readout of charges in detection area along specific paths,

    更新日期:2019-10-09
  • Constant cyclotron line energy in Hercules X–1 - Joint Insight-HXMT and NuSTAR observations
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-10-09
    G.C. Xiao, L. Ji, R. Staubert, M.Y. Ge, S. Zhang, S.N. Zhang, A. Santangelo, L. Ducci, J.Y. Liao, C.C. Guo, X.B. Li, W. Zhang, J.L. Qu, F.J. Lu, T.P. Li, L.M. Song, Y.P. Xu, Q.C. Bu, Y.X. Zhu

    The long-term evolution of the centroid energy of the CRSF in Her X-1 is still a mystery. We report a new measurement from a campaign between Insight-HXMT and NuSTAR performed in February 2018. Generally, the two satellites show well consistent results of timing and spectral properties. The joint spectral analysis confirms that the previously observed long decay phase has ended, and that the line energy

    更新日期:2019-10-09
  • The emission mechanism of gamma-ray bursts: Identification via optical-IR slope measurements
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-09-26
    Bruce Grossan, Pawan Kumar, George F. Smoot

    There is no consensus on the emission mechanism of γ-ray bursts (GRBs). A synchrotron model can produce γ-ray spectra with the empirical Band function form (Band et al., 1993), from a piece-wise two-power-law electron energy distribution (2EPLS). This synchrotron model predicts that for the same γ-ray spectrum, optical emission can be very different in fν log slope, and in flux relative to γ-rays,

    更新日期:2019-09-26
  • Theoretical model of hydrodynamic jet formation from accretion disks with turbulent viscosity
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-07-02
    E. Arshilava, M. Gogilashvili, V. Loladze, I. Jokhadze, B. Modrekiladze, N.L. Shatashvili, A.G. Tevzadze

    We develop the theoretical model for the analytic description of hydrodynamic jets from protostellar disks employing the Beltrami-Bernoulli flow configuration of disk-jet structure. For this purpose we extend the standard turbulent viscosity prescription and derive several classes of analytic solutions using the flow parametrization in self-similar variables. Derived solutions describe the disk-jet

    更新日期:2019-07-02
  • The energy function and cosmic formation rate of fast radio bursts
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-06-13
    Can-Min Deng, Jun-Jie Wei, Xue-Feng Wu

    Fast radio bursts (FRBs) are intense radio transients whose physical origin remains unknown. Therefore, it is of crucial importance to use a model-independent method to obtain the energy function and cosmic formation rate directly from the observational data. Based on current samples from the Parkes and ASKAP telecsopes, we determine, for the first time, the energy function and formation rate of FRBs

    更新日期:2019-06-13
  • A possible feedback mechanism of outflows from a black hole hyperaccretion disk in the center of jet-driven iPTF14hls
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-03-21
    Tong Liu, Cui-Ying Song, Tuan Yi, Wei-Min Gu, Xiao-Feng Wang

    iPTF14hls is an unusually bright, long-lived II-P supernova (SN), whose light curve has at least five peaks. We propose that the outflows from the black hole hyperaccretion systems in the center of the collapsars should continuously inject into the envelope. For a jet-driven core-collapsar model, the outflow feedback results in prolonging the accretion timescale and fluctuating accretion rates in our

    更新日期:2019-03-21
  • Multimessenger tests of Einstein's weak equivalence principle and Lorentz invariance with a high-energy neutrino from a flaring blazar
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-02-04
    Jun-Jie Wei, Bin-Bin Zhang, Lang Shao, He Gao, Ye Li, Qian-Qing Yin, Xue-Feng Wu, Xiang-Yu Wang, Bing Zhang, Zi-Gao Dai

    The detection of the high-energy (∼290 TeV) neutrino coincident with the flaring blazar TXS 0506+056, the first and only 3σ neutrino-source association to date, provides new, multimessenger tests of the weak equivalence principle (WEP) and Lorentz invariance. Assuming that the flight time difference between the TeV neutrino and gamma-ray photons from the blazar flare is mainly caused by the gravitational

    更新日期:2019-02-04
  • Bayesian analysis on the X-ray spectra of the binary neutron star merger GW170817
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2019-01-28
    En-Tzu Lin, Hoi-Fung Yu, Albert K.H. Kong

    For the first time, we present a Bayesian time-resolved spectral study of the X-ray afterglow datasets of GW170817/GRB17017A observed by the Chandra X-ray Observatory. These include all 12 public datasets, from the earliest observation taken at t∼9 d to the newest observation at ∼359 d post-merger. While our results are consistent with the other works using Cash statistic within uncertainty, the Bayesian

    更新日期:2019-01-28
  • Extragalactic photon–axion-like particle oscillations up to 1000 TeV
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2018-09-11
    Giorgio Galanti, Marco Roncadelli

    Axion-like particles (ALPs) are attracting increasing interest since, among other things, they are a prediction of many extensions of the standard model of elementary particles physics and in particular of superstrings and superbranes. ALPs are very light, neutral, pseudo-scalar bosons which are supposed to interact with two photons. For their mass ma≪1eV and two-photon coupling gγγa in a suitable

    更新日期:2018-09-11
  • Science with e-ASTROGAM
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2018-07-30
    A. De Angelis, V. Tatischeff, I.A. Grenier, J. McEnery, M. Mallamaci, M. Tavani, U. Oberlack, L. Hanlon, R. Walter, A. Argan, P. Von Ballmoos, A. Bulgarelli, A. Bykov, M. Hernanz, G. Kanbach, I. Kuvvetli, M. Pearce, A. Zdziarski, A. Zoglauer

    e-ASTROGAM (‘enhanced ASTROGAM’) is a breakthrough Observatory space mission, with a detector composed by a Silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV – the lower energy limit can be pushed to energies as low as 150 keV for the tracker, and to 30 keV for calorimetric detection. The

    更新日期:2018-07-30
  • Possible correlations between gamma-ray burst and its host galaxy offset
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2018-03-29
    Fei-Fei Wang, Yuan-Chuan Zou, Yu Liu, Bin Liao, Reetanjali Moharana

    We collected the information of 304 gamma-ray bursts (GRBs) from the literature, and analyzed the correlations among the host galaxy offsets (the distance from the site of the GRB to the center of its host galaxy), T90,i (the duration T90 in rest-frame), TR45,i (the duration TR45 in rest-frame), Eγ,iso (the isotropic equivalent energy), Lγ,iso (=Eγ,iso/T90,i, the isotropic equivalent luminosity) and

    更新日期:2018-03-29
  • Propagation of GeV neutrinos through Earth
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2018-03-28
    Yaithd Daniel Olivas, Sarira Sahu

    We have studied the Earth matter effect on the oscillation of upward going GeV neutrinos by taking into account the three active neutrino flavors. For neutrino energy in the range 3 to 12 GeV we observed three distinct resonant peaks for the oscillation process νe↔νμ,τ in three distinct densities. However, according to the most realistic density profile of the Earth, the second peak at neutrino energy

    更新日期:2018-03-28
  • Spectral evolution of GRBs with negative spectral lag using Fermi GBM observations
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2018-02-09
    Arundhati Chakrabarti, Kishor Chaudhury, Samir K. Sarkar, Arunava Bhadra

    The positive spectral lag of Gamma Ray Bursts (GRBs) is often explained in terms of hard-to-soft spectral evolution of GRB pulses. While positive lags of GRBs is very common, there are few GRB pulses that exhibits negative spectral lags. In the present work we examine whether negative lags of GRBs also can be interpreted in terms of spectral evolution of GRB pulses or not. Using Fermi-GBM data, we

    更新日期:2018-02-09
  • On the non-detection of Glashow resonance in IceCube
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2018-02-02
    Sarira Sahu, Bing Zhang

    Electron anti-neutrinos at the Glashow resonance (GR, at Eν¯e∼6.3 PeV) have an enhanced probability to be detected. With three neutrinos detected by IceCube in the (1–2) PeV energy range at present, one would expect that about 1 to 4 GR ν¯e should have been detected. The high-energy ∼8.7 PeV muon neutrino detected by IceCube may not be a GR event. If so, we expect to detect 50 to 70 GR ν¯e, then one

    更新日期:2018-02-02
  • Lorentz Invariance Violation effects on UHECR propagation: A geometrized approach
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2018-02-02
    Marco Danilo Claudio Torri, Stefano Bertini, Marco Giammarchi, Lino Miramonti

    We explore the possibility to geometrize the interaction of massive fermions with the quantum structure of space–time, trying to create a theoretical background, in order to explain what some recent experimental results seem to implicate on the propagation of Ultra High Energy Cosmic Rays (UHECR). We will investigate part of the phenomenological implications of this approach on the predicted effect

    更新日期:2018-02-02
  • Cosmic mass spectrometer
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-12-28
    Luis A. Anchordoqui, Vernon Barger, Thomas J. Weiler

    We argue that if ultrahigh-energy (E≳1010GeV) cosmic rays are heavy nuclei (as indicated by existing data), then the pointing of cosmic rays to their nearest extragalactic sources is expected for 1010.6≲E/GeV≲1011. This is because for a nucleus of charge Ze and baryon number A, the bending of the cosmic ray decreases as Z/E with rising energy, so that pointing to nearby sources becomes possible in

    更新日期:2017-12-28
  • Tori sequences as remnants of multiple accreting periods of Kerr SMBHs
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-11-16
    D. Pugliese, Z. Stuchlík

    Super-massive black holes (SMBHs) hosted in active galactic nuclei (AGNs) can be characterized by multi-accreting periods as the attractors interact with the environment during their life-time. These multi-accretion episodes should leave traces in the matter orbiting the attractor. Counterrotating and even misaligned structures orbiting around the SMBHs would be consequences of these episodes. Our

    更新日期:2017-11-16
  • Non-Riemannian geometry, Born–Infeld models and trace free gravitational equations
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-08-24
    Diego Julio Cirilo-Lombardo

    Non-Riemannian generalization of the standard Born–Infeld (BI) Lagrangian is introduced and analyzed from a theory of gravitation with dynamical torsion field. The field equations derived from the proposed action lead to a trace free gravitational equation (non-Riemannian analog to the trace free equation (TFE) from Finkelstein et al., 2001, Ellis et al., 2011, Ellis, 2014) and the field equations

    更新日期:2017-08-24
  • Interstellar gas and X-rays toward the Young supernova remnant RCW 86; pursuit of the origin of the thermal and non-thermal X-ray
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-08-09
    H. Sano, E.M. Reynoso, I. Mitsuishi, K. Nakamura, N. Furukawa, K. Mruganka, T. Fukuda, S. Yoshiike, A. Nishimura, A. Ohama, K. Torii, T. Kuwahara, T. Okuda, H. Yamamoto, K. Tachihara, Y. Fukui

    We have analyzed the atomic and molecular gas using the 21 cm Hi and 2.6/1.3 mm CO emissions toward the young supernova remnant (SNR) RCW 86 in order to identify the interstellar medium with which the shock waves of the SNR interact. We have found an Hi intensity depression in the velocity range between −46 and −28kms−1 toward the SNR, suggesting a cavity in the interstellar medium. The Hi cavity coincides

    更新日期:2017-08-09
  • Ultrahigh energy cosmic ray nuclei from remnants of dead quasars
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-04-05
    Roberto J. Moncada, Rafael A. Colon, Juan J. Guerra, Matthew J. O'Dowd, Luis A. Anchordoqui

    We re-examine the possibility of ultrahigh energy cosmic rays being accelerated in nearby dormant quasars. We particularize our study to heavy nuclei to accommodate the spectrum and nuclear composition recently reported by the Pierre Auger Collaboration. Particle acceleration is driven by the Blandford–Znajek mechanism, which wires the dormant spinning black holes as Faraday unipolar dynamos. We demonstrate

    更新日期:2017-04-05
  • Cosmological evolution of primordial black holes
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-03-15
    Jared R. Rice, Bing Zhang

    The cosmological evolution of primordial black holes (PBHs) is considered. A comprehensive view of the accretion and evaporation histories of PBHs across the entire cosmic history is presented, with focus on the critical mass holes. The critical mass of a PBH for current era evaporation is Mcr∼5.1×1014 g. Across cosmic time such a black hole will not accrete radiation or matter in sufficient quantity

    更新日期:2017-03-15
  • Inverse Compton emission from a cosmic-ray precursor in RX J1713.7−3946
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-03-08
    Yutaka Ohira, Ryo Yamazaki

    Recently, the High Energy Stereoscopic System (H.E.S.S.) reported two new interesting results for a γ-ray emitting supernova remnant, RX J1713.7−3946 (G347.3−0.5). The first result is the establishment of a broken power-law spectrum of GeV–TeV γ-rays. The other is a more extended γ-ray spatial profile than the one in the X-ray band. In this paper, we show both of these results can be explained by inverse

    更新日期:2017-03-08
  • Dark matter candidates, helicity effects and new affine gravity with torsion
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-02-28
    David Alvarez-Castillo, Diego Julio Cirilo-Lombardo, Jilberto Zamora-Saa

    The cross section for neutrino helicity spin-flip obtained from a new f(R,T) model of gravitation with dynamic torsion field is phenomenologically analyzed. To this end, due to the logarithmical energy dependence of the cross section, the relation with the axion decay constant fa (Peccei–Quinn parameter) is used. Consequently the link with the phenomenological energy/mass window is found from the astrophysical

    更新日期:2017-02-28
  • Lorentz factor — Beaming corrected energy/luminosity correlations and GRB central engine models
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2017-01-18
    Shuang-Xi Yi, Wei-Hua Lei, Bing Zhang, Zi-Gao Dai, Xue-Feng Wu, En-Wei Liang

    We work on a GRB sample whose initial Lorentz factors (Γ0) are constrained by the afterglow onset method and the jet opening angles (θj) are determined by the jet break time. We confirm the Γ0–Eγ,iso correlation by Liang et al. (2010), and the Γ0–Lγ,iso correlation by Lü et al. (2012). Furthermore, we find correlations between Γ0 and the beaming corrected γ-ray energy (Eγ) and mean γ-ray luminosity

    更新日期:2017-01-18
  • MeV–GeV neutrino propagation as a signal of magnetic field amplification in neutron star merger
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2016-08-03
    N. Fraija

    Short gamma-ray bursts (sGRBs) have widely been accepted to arise from a compact object binary merger; neutron star–neutron star or neutron star–black hole. During the merger of a binary neutron star system, magnetic field can be amplified beyond magnetar field strength (∼1015–1016 G) by Kelvin–Helmholtz instabilities. Considering this effect on the GRB “fireball” dynamics, we study the emission, propagation

    更新日期:2016-08-03
  • Constraining the mass of the photon with gamma-ray bursts
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2016-07-15
    Bo Zhang, Ya-Ting Chai, Yuan-Chuan Zou, Xue-Feng Wu

    One of the cornerstones of modern physics is Einstein's special relativity, with its constant speed of light and zero photon mass assumptions. Constraint on the rest mass mγ of photons is a fundamental way to test Einstein's theory, as well as other essential electromagnetic and particle theories. Since non-zero photon mass can give rise to frequency- (or energy-) dependent dispersions, measuring the

    更新日期:2016-07-15
  • Chandra observations of the HII complex G5.89-0.39 and TeV gamma-ray source HESSJ1800-240B
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2016-06-02
    E.J. Hampton, G. Rowell, W. Hofmann, D. Horns, Y. Uchiyama, S. Wagner

    We present the results of our investigation, using a Chandra X-ray observation, into the stellar population of the massive star formation region G5.89-0.39, and its potential connection to the coincident TeV gamma-ray source HESSJ1800-240B. G5.89-0.39 comprises two separate HII regions G5.89-0.39A and G5.89-0.39B (an ultra-compact HII region). We identified 159 individual X-ray point sources in our

    更新日期:2016-06-02
  • Testing Einstein's Equivalence Principle with multi-band Very Long Baseline Array measurements of AGN core shifts
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2016-04-26
    Bo Zhang, Jun-Jie Wei, He Gao, Xue-Feng Wu

    The Einstein Equivalence Principle (EEP) can be tested with deflection of light in gravitational field. In this paper, we consider the apparent shifts of active galactic nuclei (AGN) core positions are due to violations of EEP. We use data from multi-wavelength Very Long Baseline Array (VLBA) measurements and the gravitational field from our Milky Way Galaxy to put constraints on the parameterized

    更新日期:2016-04-26
  • Testing Einstein's Equivalence Principle with supercluster Laniakea's gravitational field
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2016-04-13
    Zhi-Xing Luo, Bo Zhang, Jun-Jie Wei, Xue-Feng Wu

    Comparing the parameterized post-Newtonian parameter γ values for different types of particles, or the same type of particles with different energies is an important method to test the Einstein Equivalence Principle (EEP). Assuming that the observed time delays are dominated by the gravitational potential of the Laniakea supercluster of galaxies, better results of EEP constraints can be obtained. In

    更新日期:2016-04-13
  • Could a multi-PeV neutrino event have as origin the internal shocks inside the GRB progenitor star?
    J. High Energy Astrophys. (IF 3.875) Pub Date : 2015-12-30
    N. Fraija

    The IceCube Collaboration initially reported the detection of 37 extraterrestrial neutrinos in the TeV–PeV energy range. The reconstructed neutrino events were obtained during three consecutive years of data taking, from 2010 to 2013. Although these events have been discussed to have an extragalactic origin, they have not been correlated to any known source. Recently, the IceCube Collaboration reported

    更新日期:2015-12-30
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