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arXiv 0910.2877astro-ph.HEastro-ph.IM
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X射线双星的中性吸收和光谱演化

On Neutral Absorption and Spectral Evolution in X-ray Binaries

J. M. Miller, E. M. Cackett, R. C. Reis

摘要:

现有的X射线观测站可以在很宽的亮度和源行为范围内跟踪瞬态和可变X射线双星的演化。在这样的研究中,可能不清楚在光谱的低能量部分的演化是否应该归因于源的演化,或者相反地归因于中性光电吸收的演化。色散光谱仪可以解决这个问题。我们已经分析了一个小的,但不同的X射线双星的钱德拉高能量透射光栅光谱仪观察到的亮度和不同的光谱状态的范围。在各个光电吸收边缘的柱密度保持恒定的亮度,无论是在源光谱状态内和跨。这一发现表明,在星际介质中的吸收强烈主导的中性柱密度观察到的X射线双星光谱。因此,X射线双星低能谱的演化应恰当地归因于源谱的演化。我们讨论了我们的结果的背景下,X射线二元光谱与当前和未来的X射线任务。

英文摘要:

Current X-ray observatories make it possible to follow the evolution of transient and variable X-ray binaries across a broad range in luminosity and source behavior. In such studies, it can be unclear whether evolution in the low energy portion of the spectrum should be attributed to evolution in the source, or instead to evolution in neutral photoelectric absorption. Dispersive spectrometers make it possible to address this problem. We have analyzed a small but diverse set of X-ray binaries observed with the Chandra High Energy Transmission Grating Spectrometer across a range in luminosity and different spectral states. The column density in individual photoelectric absorption edges remains constant with luminosity, both within and across source spectral states. This finding suggests that absorption in the interstellar medium strongly dominates the neutral column density observed in spectra of X-ray binaries. Consequently, evolution in the low energy spectrum of X-ray binaries should properly be attributed to evolution in the source spectrum. We discuss our results in the context of X-ray binary spectroscopy with current and future X-ray missions.

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