NOAO >   Observing Info >   Approved Programs >   2012A-0472

Small NOAO Logo

Proposal Information for 2012A-0472


PI: William C. Keel, University of Alabama, wkeel@ua.edu
Address: Physics Department, Box 870324, Tuscaloosa, AL 35487, USA

CoI: Benne Holwerda, ESTEC, Noordwijk, The Netherlands
CoI: Chris Lintott, Oxford University
CoI: Kevin Schawinski, Yale University

Title: Extended dust in dwarf galaxies - solving an energy-budget paradox?

Abstract: The role of dust in shaping the emerging spectral energy distributions of galaxies remains poorly understood; recent \it Herschel results suggest large amounts of cold dust coupled with only modest optical extinction for much of the galaxy population. Previous work has used the discovery of a silhouetted-galaxy pair of a backlit dwarf galaxy with dust features extending beyond the de Vaucouleurs radius to investigate this question. We propose to examine a larger set of galaxies of this type drawn from the Galaxy Zoo catalog of silhouetted-galaxy pairs, to see whether a significant fraction of dwarfs have such extensive dust distributions. The catalog contains ~ 150 candidate backlit dwarfs; if such dust distributions are common enough to account for the \it Herschel results, we would see many additional cases of silhouetted dust beyond their stellar disks.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2012A-0472

noaoprop-help@noao.edu

Small NOAO Logo