Backlit galaxies by the hundreds: new steps toward the evolution of dust

Details Backlit galaxies by the hundreds: new steps toward the evolution of dust Backlit galaxies by the hundreds: new steps toward the evolution of dust

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..136k&link_type=abstract

NOAO Proposal ID #2008A-0136

Physics

Scientific paper

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.

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