XMM-Newton observations of the spiral galaxy M74 (NGC 628)
Roberto Soria, Albert K. H. Kong
Abstract
The face-on spiral galaxy M74 (NGC 628) was observed by XMM on 2002 February 2. In total, 21 sources are found in the inner 5' from the nucleus (after rejection of a few sources associated to foreground stars). Hardness ratios suggest that about half of them belong to the galaxy. The higher-luminosity end of the luminosity function is fitted by a power-law of slope -0.8. This can be interpreted as evidence of ongoing star formation, in analogy with the distributions found in disks of other late-type galaxies. A comparison with previous Chandra observations reveals a new ultraluminous X-ray transient (Lx \~ 1.5 x 1039 erg/s in the 0.3--8 keV band) about 4' North of the nucleus. We find another transient black-hole candidate (Lx ~ 5 x 1038 erg/s) about 5' North-West of the nucleus. The UV and X-ray counterparts of SN 2002ap are also found in this XMM observation.
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