NOAO > Observing Info > Approved Programs > 2010A-0241
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NOAO > Observing Info > Approved Programs > 2010A-0241 |
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PI: William C. Keel, University of Alabama, wkeel@bama.ua.edu
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
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NOAO > Observing Info > Approved Programs > 2010A-0241 |
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