Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..440..209t&link_type=abstract
UP2010: Have Observations Revealed a Variable Upper End of the Initial Mass Function? ASP Conference Proceedings, Vol. 440. Pro
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The recognition of spatially extended ultraviolet disks (XUV disks) in nearly 30% of nearby spiral galaxies partially motivated recent considerations of a variable upper IMF. Most intriguing is the subset of XUV-disks which do not exhibit a comparably extended distribution of HII regions. We are attempting to improve our understanding of the XUV-disk phenomenon based on a comprehensive GALEX survey of >3000 local galaxies which examines early-type galaxies as well as spirals. We present first results from this work. Although the new survey remains in progress, one aim was to compile a statistically-significant reference sample of XUV-disk UV-emitting complexes for which the distribution function of L(Hα)/L(UV) could be measured and then compared with predictions from cluster population models incorporating stochasticity and genuine IMF variability. We also discuss HST UV-optical, Spitzer near-IR, and Magellan Hα analysis of selected XUV-disks.
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