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arXiv 2211.09082astro-ph.HE
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Be/X射线脉冲星2S 1553-542在II型爆发期间的光谱性质

Spectral properties of the Be/X-ray pulsar 2S 1553-542 during Type II outbursts

Binay Rai, Biswajit Paul, Mohammed Tobrej, Manoj Ghising, Ruchi Tamang, Bikash Chandra Paul

AI总结:

本研究对Be/X射线脉冲星2S 1553-542在II型爆发期间进行光谱分析,发现回旋加速器特征随脉冲相位变化,并识别出两种吸积状态,自旋加速率随通量增加而增加。

摘要:

我们对Be/X射线脉冲星2S 1553-542在其II型爆发期间进行了扩展研究。我们整合了NICER、Swift-XRT、RXTE-PCA、NuSTAR和FERMI的观测数据,对该源进行了详细的相位分辨和时间分辨光谱分析。我们利用该源2021年爆发期间的最新NuSTAR观测,总结了在脉冲星脉冲相位方面,源的X射线连续谱中观测到的回旋加速器特征变异的证据。时间分辨光谱分析考虑了该脉冲星2008年爆发的RXTE观测数据。硬度-强度图(HID)是使用2008年的观测数据获得的,其中强度相对于硬度比呈现出不同的分支。在高强度状态下观察到对角分支,而水平分支对应于低强度状态。从对角分支到水平分支的转变发生在光度为$(4.88\pm0.24)\times10^{37}\\;erg\\;s^{-1}$时。光子指数沿对角分支与通量呈弱正相关,沿水平分支呈负相关。两个不同的对角分支和水平分支的存在进一步反映了由临界光度分隔的两种不同吸积状态的可能性。爆发期间的自旋加速率被发现依赖于通量,并随通量的增加而增加。

英文摘要:

We present an extended study of the Be/X-ray pulsar 2S 1553-542 during its Type II outbursts. We have incorporated \emph{NICER, Swift-XRT, RXTE-PCA, \emph{NuSTAR} and FERMI} observations to carry out the detailed phase and time resolved spectral analysis of the source. We have summarized the evidence of variability of the cyclotron feature observed in the X-ray continuum of the source with respect to the pulse phases of the pulsar by using the recent \emph{NuSTAR} observation of 2021 outburst of the source. The time resolved spectral analysis has been performed by considering \emph{RXTE} observations of the 2008 outburst of the pulsar. The hardness intensity diagram (HID) has been obtained using 2008 observations in which the intensity follows distinct branches with respect to the hardness ratio. Diagonal branch is observed in the high intensity state whereas the horizontal branch corresponds to the low intensity state. The transition from the diagonal to horizontal branch occurs at the luminosity of $(4.88\pm0.24)\;\times\;10^{37}\;erg\;s^{-1}$. The photon-index exhibits a weak positive correlation with flux along the diagonal branch and negative correlation along the horizontal branch. The existence of two different diagonal and horizontal branches further reflects the possibility of two different accretion states separated by the critical luminosity. The spin-up rate during the outburst phase is found to depend on the flux and is found to increase with an increase in flux.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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