Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-29
Astron.J.132:271-289,2006
Astronomy and Astrophysics
Astrophysics
65 total pages, 22 figures, accepted for publication in the Astronomical Journal
Scientific paper
10.1086/504900
We discuss H and K observations of three fields in the bulge and disk of M31 obtained with the Altair adaptive optics system and NIRI instrument on Gemini North. These are the highest resolution and deepest near-infrared observations obtained to date of the inner regions of M31, and demonstrate the promise of ground-based adaptive optics for studying the crowded regions of nearby galaxies. We have combined our observations with previously published HST/NICMOS observations of nine M31 fields and have derived the coarse star formation histories of M31's bulge and inner disk. From fits to the M_K luminosity functions, we find the stellar population mix to be dominated by old, nearly solar-metallicity stars. The old populations, which we define as having age >~6 Gyr, indeed dominate the star formation histories at all radii independent of the relative contributions of bulge and disk stars. Although all of our fields contain some bulge contribution, our results suggest that there is no age difference between the bulge and disk to the limit of our precision.
Blum Robert David
Davidge Tim J.
Massey Philip
Olsen Knut A. G.
Rigaut Francois
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