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Stellar populations in the outskirts of M31: the mid-infrared view

Published online by Cambridge University Press:  21 March 2017

P. Barmby  and
M. Rafiei Ravandi
P. Barmby
Affiliation:
Department of Physics and Astronomy and Centre for Planetary and Space Exploration, University of Western Ontario, London, Canada email: pbarmby@uwo.ca
M. Rafiei Ravandi
Affiliation:
Department of Physics and Astronomy and Centre for Planetary and Space Exploration, University of Western Ontario, London, Canada email: pbarmby@uwo.ca
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Abstract

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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.

Keywords

infrared: galaxiesgalaxies: individual (M31)galaxies: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 19 - 21
Copyright
Copyright © International Astronomical Union 2017 

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