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arXiv:astro-ph/0011244 (astro-ph)
[Submitted on 13 Nov 2000]

Title:The central region of M31 observed with XMM-Newton (I. Group properties and diffuse emission)

Authors:R. Shirey, R. Soria, K. Borozdin, J. P. Osborne, A. Tiengo, M. Guainazzi, C. Hayter, N. La Palombara, K. O. Mason, S. Molendi, F. Paerels, W. Pietsch, W. Priedhorsky, A. M. Read, M. G. Watson, R. G. West
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Abstract: We present the results of a study based on an XMM-Newton Performance Verification observation of the central 30 arcmin of the nearby spiral galaxy M31. In the 34-ks European Photon Imaging Camera (EPIC) exposure, we detect 116 sources down to a limiting luminosity of 6 x 10^35 erg/s (0.3--12 keV, d = 760 kpc). The luminosity distribution of the sources detected with XMM-Newton flattens at luminosities below ~ 2.5 x 10^37 erg/s. We make use of hardness ratios for the detected sources in order to distinguish between classes of objects such as super-soft sources and intrinsically hard or highly absorbed sources. We demonstrate that the spectrum of the unresolved emission in the bulge of M31 contains a soft excess which can be fitted with a ~ 0.35-keV optically-thin thermal-plasma component clearly distinct from the composite point-source spectrum. We suggest that this may represent diffuse gas in the centre of M31, and we illustrate its extent in a wavelet-deconvolved image.
Comments: to appear in the XMM-Newton special issue of A&A (Vol 365, January 2001). High-resolution versions of fig. 1 and fig. 6 available on request
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011244
  (or arXiv:astro-ph/0011244v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011244
Related DOI: https://doi.org/10.1051/0004-6361%3A20000243

Submission history

From: Roberto Soria [view email]
[v1] Mon, 13 Nov 2000 13:06:22 UTC (117 KB)
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