[105.02] XMM-Newton and Chandra Observations of the Central Region of M31: Spectral Properties and Variability of X-ray Sources.

AAS 207th Meeting, 8-12 January 2006
Session 105 M31, Galaxy Kinematics and the Distance Scale
Oral, Tuesday, 2:00-3:30pm, January 10, 2006, Balcony C/D

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[105.02] XMM-Newton and Chandra Observations of the Central Region of M31: Spectral Properties and Variability of X-ray Sources.

S. P. Trudolyubov (IGPP/UCR), W. C. Priedhorsky (LANL)

We present the results of the systematic X-ray survey of the central region of M31 using the data of XMM-Newton and Chandra observations. We study X-ray spectral properties and variability of more than 100 sources detected in the field. The X-ray sources are classified based on their spectral type, variability and counterparts at other wavelengths. More than 80% of the sources in our sample show significant flux variability on the time scales of days to years. At least 60% of the sources are spectrally variable. We also use the results of our spectral analysis of the bright sources to probe the interstellar medium in the central part of M31.

This work was supported in part by NASA grant NAG5-12390.

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