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The central region of M 31 observed with XMM-Newton
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Osborne, J. P., Borozdin, K. N., Trudolyubov, S. P., Priedhorsky, W. C., Soria, R., Shirey, R., Hayter, C., La Palombara, N., Mason, K., Molendi, S., Paerels, F., Pietsch, W., Read, A. M., Tiengo, A., Watson, M. G. and West, Richard G. (2001) The central region of M 31 observed with XMM-Newton. Astronomy and Astrophysics, Volume 378 (Number 3). pp. 800-805. doi:10.1051/0004-6361:20011228
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Official URL: http://dx.doi.org/10.1051/0004-6361:20011228
Abstract
We present the results of a study based on an XMM-Newton Performance Verification observation of the central 30´of the nearby spiral galaxy M 31. In the 34-ks European Photon Imaging Camera (EPIC) exposure, we detect 116 sources down to a limiting luminosity of #1 10#2 erg s-1 (0.3-12 keV, d=760 kpc). The luminosity distribution of the sources detected with XMM-Newton flattens at luminosities below $\sim$ 2.5 1037 erg s-1 . 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 M 31 contains a soft excess which can be fitted with a $\sim$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 M 31, and we illustrate its extent in a wavelet-deconvolved image.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Astronomy and Astrophysics | ||||
| Publisher: | EDP Sciences | ||||
| ISSN: | 0004-6361 | ||||
| Official Date: | 1 January 2001 | ||||
| Dates: |
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| Volume: | Volume 378 | ||||
| Number: | Number 3 | ||||
| Page Range: | pp. 800-805 | ||||
| DOI: | 10.1051/0004-6361:20011228 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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