X-ray iron absorption line in Swift J1858.6-0814

被引：0
作者：
Asai, Kazumi [1 ]
Mihara, Tatehiro [1 ]
Sakai, Kento [1 ,2 ]
Kubota, Aya [2 ]
机构：
[1] RIKEN, MAXI Team, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
[2] Shibaura Inst Technol, Dept Elect Informat Syst, 307 Fukasaku,Minuma Ku, Saitama 3378570, Japan
来源：
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2024年 / 76卷 / 01期
关键词：
accretion; accretion disks; stars: neutron; X-rays: binaries; SLIT CAMERA GSC; MAXI; FEATURES; DISCOVERY; SPECTRA; WINDS; NICER; ASCA;
D O I：
10.1093/pasj/psad082
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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) x 10(9) 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.
引用
收藏
页码：98 / 102
页数：5
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