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

页码：98 / 102

页数：5

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