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The colliding galaxy pair NGC 2207/IC 2163, at a distance of ~39 Mpc, wasobserved with Chandra, and an analysis reveals 28 well resolved X-ray sources,including 21 ultraluminous X-ray sources (ULXs) with Lx > 10^39 erg/s, as wellas the nucleus of NGC 2207. The number of ULXs is comparable with the largestnumbers of ULXs per unit mass in any galaxy yet reported. In this paper wereport on these sources, and quantify how their locations correlate with thelocal star formation rates seen in spatially-resolved star formation ratedensity images that we have constructed using combinations of Galex FUV andSpitzer 24um images. We show that the numbers of ULXs are strongly correlatedwith the local star formation rate densities surrounding the sources, but thatthe luminosities of these sources are not strongly correlated with starformation rate density.

Spatially resolved star formation image and the ULX population in NGC2207/IC2163