S. Mineo, S. Rappaport, B. Steinhorn, A. Levine, M. Gilfanov, D. Pooley
The colliding galaxy pair NGC 2207/IC 2163, at a distance of ~39 Mpc, was observed with Chandra, and an analysis reveals 22 well resolved, luminous X-ray sources. Most of these are ultraluminous X-ray sources (ULXs) with Lx>1e+39 erg/s. The number of ULXs is comparable with the largest numbers of ULXs per unit mass in any galaxy yet reported. In this paper we report on these sources, and quantify how their locations correlate with the local star formation rates seen in spatially-resolved star formation rate density images that we have constructed using combinations of Galex FUV and Spitzer 24{\mu}m images. We show that the numbers of ULXs are strongly correlated with the local star formation rate densities surrounding the sources, but that the luminosities of these sources are not strongly correlated with star formation rate density.
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http://arxiv.org/abs/1301.4084
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