Spatially resolved star formation image and the ULX population in NGC2207/IC2163. (arXiv:1301.4084v1 [astro-ph.HE])

Spatially resolved star formation image and the ULX population in NGC2207/IC2163. (arXiv:1301.4084v1 [astro-ph.HE]):
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.