X-ray Sources in M31: Source Properties and Population

Details X-ray Sources in M31: Source Properties and Population X-ray Sources in M31: Source Properties and Population

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprb17101k&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

M31 is one of the best studied galaxies. At a distance of 700 kpc, it provides us with an opportunity to study the global properties of a galaxy which is similar to our Milky Way. We present our Chandra ACIS observations in the central region and along the disk of M31. We include the following. 1) X-ray spectra of point sources: the energy spectrum provides a hint to the properties of a source; we present the spectra of different types of X-ray sources including supernova remnants, black hole transients in the high state, supersoft sources (SSSs) and sources undergoing state transitions. 2) Statistical overview of SSSs: M31 provides the best place to study SSSs, as the extinction is relatively low and the distance is well known. In our observations, we discovered almost 50 SSS candidates; most of them are newly discovered. We compare the luminosities, colors and environmental dependence of SSSs in different regions. 3) Luminosity functions (LFs) of point sources: we compare LFs of point sources from the bulge and disk regions. It is intriguing that the LFs are different, suggesting different source populations.

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