期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 441, 期 4, 页码 3656-3665出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu832
关键词
accretion; accretion discs; black hole physics; stars: black holes; X-rays: binaries
The quiescent state is the dominant accretion mode for black holes on all mass scales. Our knowledge of the X-ray spectrum is limited due to the characteristic low luminosity in this state. Herein, we present an analysis of the sample of dynamically confirmed stellar-mass black holes observed in quiescence in the Chandra/XMM-Newton/Suzaku era resulting in a sample of eight black holes with similar to 570 ks of observations. In contrast to the majority of active galactic nuclei where observations are limited by contamination from diffuse gas, the stellar-mass systems allow for a clean study of the X-ray spectrum resulting from the accretion flow alone. The data are characterized using simple models. We find a model consisting of a power law or thermal bremsstrahlung to both provide excellent descriptions of the data, where we measure I = 2.06 +/- 0.03 and kT = 5.03(-0.31)(+0.33) keV, respectively, in the 0.3-10 keV bandpass, at a median luminosity of L-x similar to 5.5 x 10(-7)L(Edd). This result in discussed in the context of our understanding of the accretion flow on to stellar and supermassive black holes at low luminosities.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据