The 2013 outburst of a transient very faint X-ray binary, 23" from Sgr A*
arXiv:1405.0267 · doi:10.1093/mnras/stu887
Abstract
We report observations using the Swift/XRT, NuSTAR, and Chandra X-ray telescopes of the transient X-ray source CXOGC J174540.0-290005, during its 2013 outburst. Due to its location in the field of multiple observing campaigns targeting Sgr A*, this is one of the best-studied outbursts of a very faint X-ray binary (VFXB; peak erg/s) yet recorded, with detections in 173 ks of X-ray observations over 50 days. VFXBs are of particular interest, due to their unusually low outburst luminosities and time-averaged mass transfer rates, which are hard to explain within standard accretion physics and binary evolution. The 2013 outburst of CXOGC J174540.0-290005 peaked at (2-10 keV)= erg/s, and all data above ergs/s were well-fit by an absorbed power-law of photon index , extending from 2 keV out to 70 keV. We discuss the implications of these observations for the accretion state of CXOGC J174540.0-290005.
12 pages, 4 figures, MNRAS in press
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