The Star Formation History of the Outer Disk of M81

Details The Star Formation History of the Outer Disk of M81 The Star Formation History of the Outer Disk of M81

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7906w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #79.06; Bulletin of the American Astronomical Society, Vol. 39, p.870

Astronomy and Astrophysics

Astronomy

Scientific paper

Using deep photometric data from the ACS Nearby Galaxy Survey Treasury, we have measured the star formation history of a portion of the outer disk of the nearby spiral galaxy M81. Our field covers the boundary of a spiral arm, allowing comparisons of the populations inside and outside of the arm. The field is sparse enough and the exposure deep enough to provide photometry 1 mag fainter than the red clump. This depth provides detailed information about the old populations in this region of M81. Our results show that the stellar populations of this region are dominated by old stars, that the difference between the arm and interarm regions can be attributed to a small fraction of the population with ages less than a few hundred Myr, and that the metallicity of this portion of the outer disk has evolved very little over the past 10 Gyr. ANGST is supported by HST GO-10915 administered by NASA.

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