Chandra Detection of Xte J1650–500 in Quiescence and the Minimum Luminosity of Black Hole X-ray Binaries

نویسندگان

  • ELENA GALLO
  • JOHN A. TOMSICK
چکیده

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 2.5–5.0 × 10 erg s cm. 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 jand n-driven low-mass X-ray binaries. This suggests that a few 10 erg s might be a limiting luminosity value for quiescent black holes. Subject headings: X-rays: binaries — accretion, accretion disks — black hole physics — stars: individual (XTE J1650–500)

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تاریخ انتشار 2008