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Title: RX J0042.3+4115: A stellar mass black hole binary identified in M 31
Authors: Barnard, R.
Osborne, J. P.
Kolb, U.
Borozdin, K. N.
First Published: 1-Jul-2003
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2003, 405 (2), pp. 505-511
Abstract: 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 ~ $1{-}3\times 10^{38}$ 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 (~ 1036 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.
DOI Link: 10.1051/0004-6361:20030638
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2003 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Description: Erratum available at doi: 10.1051/0004-6361:20035661e
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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