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首页> 外文期刊>The Astrophysical journal >DRAMATIC VARIABILITY OF X-RAY ABSORPTION LINES IN THE BLACK HOLE CANDIDATE CYGNUS X-1
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DRAMATIC VARIABILITY OF X-RAY ABSORPTION LINES IN THE BLACK HOLE CANDIDATE CYGNUS X-1

机译：黑洞候选犬天鹅座X-1的X射线吸收线的突变性

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摘要

We report results from a 30 ks observation of Cygnus X-1 with the High Energy Transmission Grating Spectrometer (HETGS) on board the Chandra X-Ray Observatory. Numerous absorption lines were detected in the HETGS spectrum. The lines are associated with highly ionized Ne, Na, Mg, Al, Si, S, and Fe, some of which have been seen in earlier HETGS observations. Surprisingly, however, we discovered dramatic variability of the lines over the duration of the present observation. For instance, the flux of the Ne x line at 12.14 A was about 5 x 10~(-3) photons cm~(-2) s~(-1) in the early part of the observation but became subsequently undetectable, with a 99% upper limit of 0.06 x 10~(-3) photons cm~(-2) s~(-1) on the flux of the line. This implies that the line weakened by nearly 2 orders of magnitude on a timescale of hours. The overall X-ray flux of the source did also vary during the observation but only by 20%-30%. For Cyg X-1, the absorption lines are generally attributed to the absorption of X-rays by ionized stellar wind in the binary system. Therefore, they may provide valuable diagnostics on the physical condition of the wind. We discuss the implications of the results.
机译：我们报告了钱德拉X射线天文台上用高能透射光栅光谱仪（HETGS）对天鹅座X-1进行30 ks观测的结果。在HETGS光谱中检测到许多吸收线。这些谱线与高度离子化的Ne，Na，Mg，Al，Si，S和Fe有关，其中一些在早期HETGS观测中已经发现。然而，令人惊讶的是，我们发现了在本观察期间内这些线的巨大变化。例如，在观察的早期，Ne x线在12.14 A处的通量约为5 x 10〜（-3）光子cm〜（-2）s〜（-1），但随后变得不可检测，具有线通量的0.06 x 10〜（-3）光子cm〜（-2）s〜（-1）的99％上限。这意味着该线路在几小时的时间尺度上减弱了将近2个数量级。在观察过程中，光源的总X射线通量也确实发生了变化，但仅变化了20％-30％。对于Cyg X-1，吸收线通常归因于二元系统中电离恒星风对X射线的吸收。因此，它们可以为风的物理状况提供有价值的诊断。我们讨论了结果的含义。

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