Hai-Hui Zhao

Study of Wide-Field-of-View X-ray Observations of the Virgo Cluster Using the Lobster Eye Imager for Astronomy

Wen-Cheng Feng, Hai-Hui Zhao, Heng Yu, Haiwu Pan et autres

The Lobster Eye Imager for Astronomy (LEIA) is the pathfinder of the wide-field X-ray telescope used in the Einstein Probe mission. In this study, we present an image of the Virgo Cluster taken by LEIA in the 0.5-4.5 keV band with an …

Study of Wide-Field-of-View X-ray Observations of the Virgo Cluster Using the Lobster Eye Imager for Astronomy

Wen-Cheng Feng, S. M. Jia, Hai-Hui Zhao, Heng Yu et autres

The Lobster Eye Imager for Astronomy (LEIA) is the pathfinder of the wide-field X-ray telescope used in the Einstein Probe mission. In this study, we present an image of the Virgo Cluster taken by LEIA in the 0.5–4.5 keV band with an …

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Weak Merging Scenario of CLASH Cluster A209

Wen-Cheng Feng, Heng Yu, Hai-Hui Zhao, Xiao-Lan Hou et autres

Abstract We study the structural and dynamical properties of A209 based on Chandra and XMM-Newton observations. We obtain detailed temperature, pressure, and entropy maps with the contour binning method, and find a hot region in the NW direction. The X-ray brightness residual …

cn, it, us (code pays fourni par la source)

"Magnetic gates" of accreting X-ray pulsars during giant outbursts

Han-Long Peng, Yan Zhang, Yujing Xu, Xiaodong Li et autres

Abstract X-ray pulsars (XRPs) consist of a magnetized neutron star (NS) and an optical donor star. The NS accretes matter from the donor star, producing pulsed X-ray emission. In most cases the donor stars are Be stars, and accretion is episodic, that …

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Evolution of Accretion Modes between Spectral States Inferred from Spectral and Timing Analysis of Cygnus X-1 with Insight-HXMT Observations

M. Z. Feng, Ling-Da Kong, Peng-Ju Wang, Shuang‐Nan Zhang et autres

Abstract We execute a detailed spectral-timing study of Cygnus X-1 in the low/hard, intermediate, and high/soft states with observations from the Hard X-ray Modulation Telescope. The broadband energy spectra fit well with the “truncated disk model”: the inner boundary of the accretion …

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Peculiar Disk Behaviors of the Black Hole Candidate MAXI J1348–630 in the Hard State Observed by Insight-HXMT and Swift

W. Zhang, Lian Tao, Roberto Soria, Jin‐Lu Qu et autres

Abstract We present a spectral study of the black hole candidate MAXI J1348−630 during its 2019 outburst, based on monitoring observations with Insight-HXMT and Swift. Throughout the outburst, the spectra are well fitted with power-law plus disk-blackbody components. In the soft-intermediate and …

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New Insight into the Rapid Burster by Insight-HXMT

Yupeng Chen, Shu Zhang, Shuang‐Nan Zhang, Long Ji et autres

Abstract We report the timing and spectral analyses of the type-II X-ray bursts from the rapid burster (MXB 1730–335) observed by the Hard X-ray Modulation Telescope (Insight-HXMT) and Swift/X-Ray Telescope (XRT). By stacking the long-duration bursts, we find for the first time …

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Insight-HXMT Firm Detection of the Highest-energy Fundamental Cyclotron Resonance Scattering Feature in the Spectrum of GRO J1008-57

Mingyu Ge, Long Ji, Shuang‐Nan Zhang, Andrea E. Santangelo et autres

Abstract We report on the observation of the accreting pulsar GRO J1008-57 performed by Insight-Hard X-ray Modulation Telescope (HXMT) at the peak of the source’s 2017 outburst. Pulsations are detected with a spin period of 93.283(1) s. The pulse profile shows double …

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Discovery of Delayed Spin-up Behavior Following Two Large Glitches in the Crab Pulsar, and the Statistics of Such Processes

Mingyu Ge, Shuang‐Nan Zhang, F. J. Lu, Tong Li et autres

Abstract Glitches correspond to sudden jumps of rotation frequency (ν) and its derivative ( ) of pulsars, the origin of which remains not well understood yet, partly because the jump processes of most glitches are not well time-resolved. There are three large …

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Insight-HXMT insight into switch of the accretion mode: The case of the X-ray pulsar 4U 1901+03

Y. L. Tuo, Long Ji, Sergey S. Tsygankov, T. Mihara et autres

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Insight-HXMT insight into switch of the accretion mode: the case of the X-ray pulsar 4U 1901+03

Y. L. Tuo, Long Ji, Sergey S. Tsygankov, T. Mihara et autres

We use the In 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 …

Switches between accretion structures during flares in 4U 1901+03

Long Ji, Lorenzo Ducci, Andrea E. Santangelo, Shu Zhang et autres

ABSTRACT We report on our analysis of the 2019 outburst of the X-ray accreting pulsar 4U 1901+03 observed with Insight-HXMT and NICER. Both spectra and pulse profiles evolve significantly in the decaying phase of the outburst. Dozens of flares are observed throughout …

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