EP J175257.3-351923 is identified as a candidate black hole low-mass X-ray binary from its FRED outburst profile, persistent hard state, truncated disk spectrum with 217 keV cutoff, and high X-ray-to-optical ratio.
The 2013 outburst of a transient very faint X-ray binary, 23" from Sgr A*
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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 $L_X<10^{36}$ 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 $L_X$(2-10 keV)=$5.0\times10^{35}$ erg/s, and all data above $10^{34}$ ergs/s were well-fit by an absorbed power-law of photon index $\sim1.7$, extending from 2 keV out to $\sim$70 keV. We discuss the implications of these observations for the accretion state of CXOGC J174540.0-290005.
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Discovery of EP J175257.3-351923 as a Candidate Black Hole Low-Mass X-ray Binary
EP J175257.3-351923 is identified as a candidate black hole low-mass X-ray binary from its FRED outburst profile, persistent hard state, truncated disk spectrum with 217 keV cutoff, and high X-ray-to-optical ratio.