Evidence for Fe Kα line and soft X-ray lag in NGC 7456 ultraluminous X-ray source-1

被引：3

作者：

Mondal, Samaresh ^{[1
]}

Rozanska, Agata ^{[1
]}

De Marco, Barbara ^{[2
]}

Markowitz, Alex ^{[1
,3
]}

机构：

[1] Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland

[2] Univ Politecn Cataluna, EEBE, Dept Fis, Av Eduard Maristany 16, E-08019 Barcelona, Spain

[3] Univ Calif San Diego, Ctr Astrophys & Space Sci, MC 0424, La Jolla, CA 92093 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 505卷 / 01期

关键词：

X-rays: binaries; X-rays: individual NGC 7456 ULX-1; TIME LAGS; HARD STATE; 5408; X-1; VARIABILITY; DISCOVERY; PULSATIONS; SPECTRUM; PULSAR; DISC; ULX;

D O I：

10.1093/mnrasl/slab061

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the first detection of an Fe K-alpha line and soft X-ray lag in the ultraluminous X-ray (ULX) source NGC 7456 ULX-1. The XMM-Newton spectra show the presence of the 6.4 keV Fe line at 2.6 sigma confidence and an upper limit on the FWHM of 32900 km s(-1). Assuming that the line arises by reflection from a Keplerian disk, it must originate beyond 85r(g) from the compact object. As a result of Fourier timing analysis, we found that the soft X-ray photons lag behind the hard X-ray photons with a similar to 1300 s delay. The covariance spectra indicate that the hard spectral component is responsible for the correlated variability and the soft X-ray lag. This is the second ULX in which an Fe K-alpha line is found, the fifth with a soft X-ray lag, and the first with both features detected.

引用

页码：L106 / L111

页数：6

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