Physics and Astronomy Publications
Document Type
Article
Publication Date
3-1-2016
Journal
Proceedings of the International Astronomical Union
Volume
11
Issue
S321
First Page
19
Last Page
21
URL with Digital Object Identifier
10.1017/S1743921316011054
Abstract
The mid-infrared provides a unique view of galaxy stellar populations, sensitive to both the integrated light of old, low-mass stars and to individual dusty mass-losing stars. We present results from an extended Spitzer/IRAC survey of M31 with total lengths of 6.6 and 4.4 degrees along the major and minor axes, respectively. The integrated surface brightness profile proves to be surprisingly difficult to trace in the outskirts of the galaxy, but we can also investigate the disk/halo transition via a star count profile, with careful correction for foreground and background contamination. Our point-source catalog allows us to report on mid-infrared properties of individual objects in the outskirts of M31, via cross-correlation with PAndAS, WISE, and other catalogs.
