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2011MNRAS.418L.124V - Mon. Not. R. Astron. Soc., 418, L124-L128 (2011/November-3)
On the association of ULXs with young superclusters: M82 X-1 and a new candidate in NGC 7479.
VOSS R., NIELSEN M.T.B., NELEMANS G., FRASER M. and SMARTT S.J.
Abstract (from CDS):
To date, M82 X-1 is the only ULX claimed to be coincident with a young massive stellar cluster. We remeasure the position of this source with a high accuracy and find that the position of the X-ray source is 0.65 arcsec away from the stellar cluster, corresponding to an offset significance of 3σ.
We also report the discovery of a new candidate, based on observations of NGC 7479. One of the ULXs observed in three X-ray observations is found to be spatially coincident (within 1σ of the position error) with a young supercluster observed in the HST images. In the brightest state, the absorbed luminosity of the ULX is a few times 1040 erg/s, and in the faintest state below the detection limit of ∼ 4 times 1039 erg/s. The luminosity in the brightest state requires an accreting black hole mass of at least 100 M☉ assuming isotropic emission. However, it is possible that the source is contaminated by X-ray emission from the nearby supernova SN2009jf. In this case, the luminosity of the ULX is in a range where it is strongly debated whether it is a super-Eddington stellar mass black hole or an intermediate-mass black hole. The colours of the host cluster indicate a young stellar population, with an age between 10 and 100 Myr. The total stellar mass of the cluster is ∼ 5 {x} 105 M☉.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): black hole physics - galaxies: star clusters: general - X-rays: binaries
Simbad objects: 10
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