Discovery of a bright X-ray transient in the Galactic Center with XMM-Newton

被引：25

作者：

Porquet, D

Grosso, N

Burwitz, V

Andronov, IL

Aschenbach, B

Predehl, P

Warwick, RS

机构：

[1] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

[2] Univ Grenoble 1, Lab Astrophys Grenoble, F-38041 Grenoble 9, France

[3] Odessa Natl Univ, Dept Astron, UA-65014 Odessa, Ukraine

[4] Crimean Astrophys Observ, UA-98409 Nauchnyi, Ukraine

[5] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 430卷 / 01期

关键词：

galaxy : center; X-rays : binaries; X-rays : individuals : XMMUJ174554.4-285456;

D O I：

10.1051/0004-6361:200400117

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a bright X-ray transient object, XMMU J174554.4-285456, observed in outburst with XMM-Newton on October 3, 2002, and located at 6.3' from Sgr A*, the supermassive black hole at the Galactic center. This object exhibits a very large X-ray luminosity variability of a factor of about 1300 between two X-ray observations separated by four months. The X-ray spectrum is best fitted by a power-law with a photon index of 1.6 +/- 0.2 and absorption column density of 14.1(-1.4)(+1.6) x 10(22) cm(-2). This large absorption suggests this source is located at the distance of the Galactic center, i.e., 8 kpc. The 2-10 keV luminosity is about 1.0 x 10(35) (d/8 kpc)(2) erg s(-1). A pulsation period of about 172 s is hinted by the timing analysis. The X-ray properties strongly suggest a binary system with either a black hole or a neutron star for the compact object.

引用

页码：L9 / L12

页数：4