State-Changing Soft X-Ray Sources in M31: White Dwarfs? Neutron Stars? or Black Holes?
|Names||Brandon Patel, Rosanne di Stefano, Thomas Nelson, Francis A. Primini, Jifeng Liu, Marina Orio|
|Conference Name||Chandra's First Decade of Discovery|
|Date||September 1, 2009|
|Short Title||State-Changing Soft X-Ray Sources in M31|
|Library Catalog||NASA ADS|
|Abstract||Our Galaxy and the Magellanic Clouds contain ˜18 well studied supersoft x-ray sources (SSSs). None of these sources has ever been observed in a harder state. Two SSSs in M31 have, however, been observed in quasisoft and/or hard states. We have used Chandra, XMM-Newton, and Swift to document these changes. We present the results and discuss possible models for the sources.|