NOAO >   Observing Info >   Approved Programs >   2014A-0265

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Proposal Information for 2014A-0265


PI: Shawn Staudaher, University of Wyoming, sstaudaher@gmail.com
Address: Physics Department, 1000 E. University, Dept 3905, Laramie, WY 82071, USA

CoI: Daniel Dale, University of Wyoming
CoI: Liese van Zee, Indiana University
CoI: Kate Barnes, Indiana University

Title: EDGES: Studying the mass and stellar populations of the extended stellar structures of nearby galaxies

Abstract: An understanding of how galactic stellar disks and halos form hinges on an exquisite understanding of the origins of their stellar populations, including whether they arose from the initial gas within the galaxy or by accretion of smaller satellite galaxies. To address this question, we have obtained ultra-deep, wide field-of-view 3.6 and 4.5 (micron) Spitzer data as part of the EDGES survey of 92 nearby galaxies. These near-infrared data utilize the older stellar populations to constrain the stellar mass distributions within the disks and associated tidal streams. To constrain the younger stellar populations in these disks and streamers, deep optical data are needed. We have selected the subset of 12 EDGES galaxies that exhibit the brightest tidal streams for careful follow-up with the 4 m Mosaic Imager. Deep BVR+H(alpha) data will enable a comparison of the relative ages of the disks and streamers, and thereby ascertain if it is likely they have a similar origin.


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 >   2014A-0265

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