Kazumi Asai, Tatehiro Mihara, Kento Sakai, Aya Kubota
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引用次数: 0
摘要
我们介绍了用中子星内部成分探测器（NICER）观测到的瞬变中子星低质量X射线双星Swift J1858.6-0814爆发中明亮稳定状态的光谱分析。我们在光谱中探测到了一条位于 6.97 keV 的电离铁 K 吸收线（类 H 铁）。我们利用铁 xxvi（类 H）（17 ± 5 eV）和铁 xxv（类 He）（<3 eV）的等效宽度之比估算了光电离参数，并讨论了铁吸收线的起源。产生吸收线的辐照气体位于 X 射线源 (3-6) × 109 厘米范围内。我们认为，观测到的类H铁吸收线来源于Swift J1858.6-0814内部吸积盘中的高电离气体。
We present the spectral analysis of bright steady states in an outburst of the transient neutron star low-mass X-ray binary Swift J1858.6−0814 observed with the Neutron star Interior Composition Explorer (NICER). We detected an ionized iron K absorption line (H-like Fe) at 6.97 keV in the spectrum. We estimate the photoionization parameter using the ratio of the equivalent widths of the Fe xxvi (H-like) (17 ± 5 eV) and Fe xxv (He-like) (<3 eV) and discuss the origin of the iron absorption line. The irradiated gas producing the absorption line would locate within (3–6) × 109 cm of the X-ray source. We suggest that the observed H-like Fe absorption line originates from the highly ionized gas in the inner accretion disk in Swift J1858.6−0814.
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Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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