NOAO > Observing Info > Approved Programs > 2008A-0136
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NOAO > Observing Info > Approved Programs > 2008A-0136 |
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PI: William C. Keel, University of Alabama, keel@bildad.astr.ua.edu
Address: Physics Department, Box 870324, Tuscaloosa, AL 35487, USA
CoI: Anna Manning, University of Alabama
CoI: Chris Lintott, Oxford University
CoI: Benne Holwerda, STScI
Title: Backlit galaxies by the hundreds: new steps toward the evolution of dust
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 hundreds of 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. These 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.
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 > 2008A-0136 |
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