X-ray iron absorption line in Swift J1858.6−0814-Reference-Cited by-同舟云学术

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

Published:2024-01-12 Issue:1 Volume:76 Page:98-102
ISSN:0004-6264
Container-title:Publications of the Astronomical Society of Japan
language:en
Short-container-title:

Author:

Asai Kazumi¹,Mihara Tatehiro¹,Sakai Kento¹²,Kubota Aya²

Affiliation:

1. MAXI team, RIKEN, 2-1 Hirosawa, Wako , Saitama 351-0198, Japan

2. Department of Electronic Information Systems, Shibaura Institute of Technology, 307 Fukasaku , Minuma-ku, Saitama-shi, Saitama 337-8570, Japan

Abstract

Abstract 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.

Publisher

Oxford University Press (OUP)

Link

https://academic.oup.com/pasj/article-pdf/76/1/98/56610253/psad082.pdf

Reference23 articles.

1. Discovery of X-ray absorption features from the dipping low-mass X-ray binary XB 1916-053 with XMM-Newton

2. Soft X-ray emission lines in the X-ray binary Swift J1858.6–0814 observed with XMM–Newton Reflection Grating Spectrometer: disc atmosphere or wind?

3. Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6–0814 observed with NICER and NuSTAR

4. Dips and eclipses in the X-ray binary Swift J1858.6–0814 observed with NICER