PI: William C. Keel, University of Alabama, firstname.lastname@example.org
Address: Physics Department, Box 870324, Tuscaloosa, AL 35487, USA
CoI: Anna Manning, University of Alabama
CoI: Benne Holwerda, University of Cape Town
CoI: Chris Lintott, Oxford University
Title: Dust in backlit galaxies - completing the UV sample
Abstract: Photometric analysis of backlit galaxies is a powerful way to measure the extinction in disks, but has hitherto been limited by the number of suitable pairs near enough for analysis. New searches of the SDSS imagery (mostly from the public galaxyzoo.org project) have revealed over 1800 candidate pairs, opening the possibility of tracing extinction properties across Hubble type and surface brightness, and using spiral/spiral pairs to extend extinction measures into the UV through incorporating GALEX survey data (under a NASA ADP project). This is a necessary step toward adding silhouetted galaxies in deep HST imagery to trace the cosmic evolution of dust in galaxies with a single technique. Our analysis so far shows that the SDSS data are excellent for finding these pairs, but that deeper imagery is needed for the requisite extinction measurements. This proposal would essentially complete deep optical imaging for the local pairs with deep GALEX imagery, where we can extend the reddening-law measurements into the UV for direct comparison with high-redshift HST samples.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360