The 2021 outburst of 2S 1417–624 revisited with AstroSat

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Journal of Astrophysics and Astronomy Pub Date : 2024-10-18 DOI:10.1007/s12036-024-10020-0
Chetana Jain
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Abstract

This work presents the first-ever broadband (0.7–25.0 keV) timing and spectral analysis of Be-HMXB 2S 1417–624 during its 2021 outburst. Using AstroSat observations, coherent pulsations at \(\sim \)17.36633 s (MJD 59239.082) were detected in 0.7–7.0 keV SXT and 3.0–25.0 keV LAXPC data. The pulse profile was dual peaked at all energies, with the relative intensity of the main peak increasing with energy. The peaks in the SXT profiles were broad and comprised of several mini-structures. The LAXPC profiles were relatively smooth and had higher pulsed fractions, which increased with energy. The SXT\(+\)LAXPC simultaneous energy spectrum is well described by an absorbed power-law with exponential cut-off, a \(\sim \)1.6 keV black body component, and a 6.47 keV emission line. A model comprising of an absorbed power law with high energy cut-off plus a partial covering absorber and Gaussian emission line fits the spectrum quite well. These results have been compared with timing and spectral features during the previous outbursts of this transient pulsar.

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利用 AstroSat 重新审视 2021 年 2S 1417-624 的爆发
这项工作首次对2021年爆发期间的Be-HMXB 2S 1417-624进行了宽带(0.7-25.0 keV)定时和光谱分析。通过AstroSat的观测,在0.7-7.0 keV SXT和3.0-25.0 keV LAXPC数据中探测到了(\(\sim \)17.36633 s (MJD 59239.082))相干脉冲。脉冲轮廓在所有能量下都是双峰,主峰的相对强度随能量的增加而增加。SXT 曲线中的峰值很宽,由几个小结构组成。LAXPC 曲线相对平滑,脉冲分数较高,且随能量的增加而增加。SXT/(+\)LAXPC同时能谱由一个指数截止的吸收幂律、一个\(\sim \)1.6 keV的黑体成分和一条6.47 keV的发射线很好地描述。一个由具有高能量截止的吸收幂律加上部分覆盖吸收体和高斯发射线组成的模型很好地拟合了光谱。这些结果与这颗瞬态脉冲星以前爆发时的时间和光谱特征进行了比较。
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来源期刊
Journal of Astrophysics and Astronomy
Journal of Astrophysics and Astronomy 地学天文-天文与天体物理
CiteScore
1.80
自引率
9.10%
发文量
84
审稿时长
>12 weeks
期刊介绍: The journal publishes original research papers on all aspects of astrophysics and astronomy, including instrumentation, laboratory astrophysics, and cosmology. Critical reviews of topical fields are also published. Articles submitted as letters will be considered.
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