Analysis of a State Changing Supersoft X-ray Source in M31

Details Analysis of a State Changing Supersoft X-ray Source in M31 Analysis of a State Changing Supersoft X-ray Source in M31

2010-08-12

arxiv.org/abs/1008.2158v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Scientific paper

We report on observations of a SSS in M31, r1-25, that has exhibited spectral changes to harder X-ray states. We document these spectral changes. In addition, we show that they have important implications for modeling the source. Quasisoft states in a source that has been observed as an SSS represent a newly-discovered phenomenon. We show how such state changers could prove to be examples of unusual black hole or neutron star accretors. Future observations of this and other state changers can provide the information needed to determine the nature(s) of these intriguing new sources.

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