The 3.6 micron Surface Brightness Profiles of Outer Disks: NGC 4625 and M 83

Details The 3.6 micron Surface Brightness Profiles of Outer Disks: NGC 4625 and M 83 The 3.6 micron Surface Brightness Profiles of Outer Disks: NGC 4625 and M 83

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60072b&link_type=abstract

Spitzer Proposal ID #60072

Physics

Scientific paper

The outer regions of galactic disks have been a topic of increased interest since ultraviolet observations with the GALEX observatory demonstrated that nearly 30% of galaxies show extended UV emission and star formation, tracing to well beyond the optical radius (R25). Although young stellar populations in these disks are being studied intensively in the UV and H-alpha, very little is known about the older stellar population of outer disks. We request 16.8 hours to image the outskirts of two prototype 'XUV' (extended UV emission) galaxies, with sufficient depth and field coverage to measure their 3.6 micron profiles. Using these profiles we will derive radial stellar mass profiles, UV-IR color profiles, and gas fraction profiles. These will allow us to address several critical questions about the formation and evolution of these outer disks and the host galaxies themselves.

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