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The low-luminosity accretion disc wind of the black hole transient V4641 Sagittarii
Teo Muñoz-Darias, Manuel A. P. Torres, Michael R. Garcia
We present an optical spectroscopic study of the black hole X-ray transient V4641 Sgr (=SAX J1819.3-2525) covering the 1999, 2002 and 2004 outbursts. The spectra were taken over 22…
Around 200 new X-ray binary IDs from 13 years of Chandra observations of the M31 center
R. Barnard, M. R. Garcia, F. Primini +3
We have created 0.3--10 keV, 13 year, unabsorbed luminosity lightcurves for 528 X-ray sources in the central 20' of M31. We have 174 Chandra observations spaced at ~1 month interva…
The second ULX transient in M31: Chandra, HST and XMM observations, and evidence for an extended corona
R. Barnard, M. Garcia, S. S. Murray
XMM J004243.6+412519 is a transient X-ray source in M31, first discovered 2012 January 15. Different approaches to fitting the brightest follow-up observation gave luminosities 1.3…
A period distribution of X-ray binaries observed in the central region of M31 with Chandra and HST
R. Barnard, J. L. Galache, M. Garcia +4
Almost all Galactic black hole binaries with low mass donor stars are transient X-ray sources; we expect most of the X-ray transients observed in external galaxies to be black hole…
12 years of X-ray variability in M31 globular clusters, including 8 black hole candidates, as seen by Chandra
R. Barnard, M. Garcia, S. S. Murray
We examined 134 Chandra observations of the population of X-ray sources associated with globular clusters (GCs) in the central region of M31. These are expected to be X-ray binary…
Reinstating the M31 X-ray system RX J0042.3+4115 as a black hole X-ray binary, and compelling evidence for an extended corona
R. Barnard, M. R. Garcia, S. S. Murray
The M31 X-ray source RX J0042.3+4115 was originally identified as a black hole binary because it displayed characteristic low state variability at conspicuously high luminosities;…