Chandra detection of XTE J1650-500 in quiescence and the minimum luminosity of black hole X-ray binaries

Details Chandra detection of XTE J1650-500 in quiescence and the minimum luminosity of black hole X-ray binaries Chandra detection of XTE J1650-500 in quiescence and the minimum luminosity of black hole X-ray binaries

2008-06-22

arxiv.org/abs/0806.3491v1

Astrophys. J. 683 (2008) L51

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ as a Letter

Scientific paper

10.1086/591230

The Galactic black hole X-ray binary XTE J1650-500 entered a quiescent regime following the decline from the 2001-2002 outburst that led to its discovery. Here we report on the first detection of its quiescent counterpart in a 36 ks observation taken in 2007 July with the Chandra X-ray Observatory. The inferred 0.5-10 keV unabsorbed flux is in the range 2.5-5.0x1e-15 erg/s/cm^2. Notwithstanding large distance uncertainties, the measured luminosity is comparable to that of the faintest detected black hole X-ray binaries, all having orbital periods close to the expected bifurcation period between j- and n-driven low-mass X-ray binaries. This suggests that a few 1e30 erg/s might be a limiting luminosity value for quiescent black holes.

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