CXO M31 J004253.1+411422: The First Ultra-luminous X-ray Transient In M 31

Details CXO M31 J004253.1+411422: The First Ultra-luminous X-ray Transient In M 31 CXO M31 J004253.1+411422: The First Ultra-luminous X-ray Transient In M 31

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944205k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #442.05

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on Chandra/Swift/XMM-Newton observations of an ultraluminous X-ray (ULX) source in M 31 discovered by Chandra-HRC-I on December 17, 2009. The light curve was established using follow up observations with Swift-XRT and XMM-Newton. The X-ray spectrum is best fit by a combination of a thermal component with kT 1 keV and a non-thermal component (single powerlaw) with photon index 2.6. The maximum unabsorbed total luminosity derived from this data is 3.8 x 1039 erg/s, and subsequently decreased to 0.6 x 1039 erg/s on a time scale of one month. The luminosity exhibits a FRED (Fast Rise Exponential Decay) pattern with an exponential time constant of 32 days. The underlying source for this ULX is likely a 14 Msun black hole, accreting near the Eddington limit.

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