2001A&A...365L.195S


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.16CEST04:57:52

2001A&A...365L.195S - Astronomy and Astrophysics, volume 365, L195-201 (2001/1-1)

The central region of M 31 observed with XMM-Newton. I. Group properties and diffuse emission.

SHIREY R., SORIA R., BOROZDIN K., OSBORNE J.P., TIENGO A., GUAINAZZI M., HAYTER C., LA PALOMBARA N., MASON K., MOLENDI S., PAERELS F., PIETSCH W., PRIEDHORSKY W., READ A.M., WATSON M.G. and WEST R.G.

Abstract (from CDS):

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 6x1035erg/s (0.3-12keV, d=760kpc). The luminosity distribution of the sources detected with XMM-Newton flattens at luminosities below ∼2.5x1037erg/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 M 31 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 M 31, and we illustrate its extent in a wavelet-deconvolved image.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M 31 - galaxies: spiral - galaxies: general - galaxies: ISM - X-rays: galaxies

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 RX J0042.2+4118 XB? 00 42 12.284 +41 18 37.45   13.423 12.847 12.510 12.296 ~ 14 0
2 CXOGMP J004244.2+411608 X 00 42 44.2 +41 16 08           ~ 2 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10520 1
4 RX J0043.5+4113 X 00 43 34.410 +41 13 23.72           ~ 15 0

    Equat.    Gal    SGal    Ecl

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2019.09.16-04:57:52

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