RX J0042.3+4115: A stellar mass black hole binary identified in M 31

被引：15

作者：

Barnard, R

Osborne, JP

Kolb, U

Borozdin, KN

机构：

[1] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6BT, Bucks, England

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

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 405卷 / 02期

关键词：

X-rays : general; galaxies : individual : M 31; X-rays : binaries; black hole physics;

D O I：

10.1051/0004-6361:20030638

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Four XMM-Newton X-ray observations of the central region of the Andromeda Galaxy (M 31) have revealed an X-ray source that varies in luminosity over similar to1-3 x 10(38) erg s(-1) between observations and also displays significant variability over time-scales of a few hundred seconds. The power density spectra of lightcurves obtained in the 0.3-10 keV energy band from the three EPIC instruments on board XMM-Newton are typical of disc-accreting X-ray binaries at low accretion rates, observed in neutron star binaries only at much lower luminosities (similar to10(36) erg s(-1)). However X-ray binaries with massive black hole primaries have exhibited such power spectra for luminosities >10(38) erg s(-1). We discuss alternative possibilities where RX J0042.3+4115 may be a background AGN or foreground object in the field of view, but conclude that it is located within M 31 and hence use the observed power spectra and X-ray luminosities to identify the primary as a black hole candidate.

引用

页码：505 / 511

页数：7

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