Panchromatic Hubble Andromeda Treasury (PHAT): Comparing Ages and Masses of GALEX UV-Bright Regions and Resolved Stars

Details Panchromatic Hubble Andromeda Treasury (PHAT): Comparing Ages and Masses of GALEX UV-Bright Regions and Resolved Stars Panchromatic Hubble Andromeda Treasury (PHAT): Comparing Ages and Masses of GALEX UV-Bright Regions and Resolved Stars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915107s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #151.07

Astronomy and Astrophysics

Astronomy

Scientific paper

The Panchromatic Hubble Andromeda Treasury (PHAT) offers a rich set of multi-wavelength HST imaging (UV through near-IR) with which to study the resolved populations in the disk of M31. This provides a unique opportunity to investigate how well integrated UV flux can be used to estimate various properties (e.g., age, mass, and extinction) of the underlying stellar populations. Kang et al. (2009) measured the total NUV and FUV GALEX flux within a set of UV-bright regions in M31 and used stellar population models to estimate ages and masses. In this followup study, we use a maximum likelihood color-magnitude diagram fitting technique with the optical photometry of resolved stars in the PHAT survey to measure the star formation histories (mass formed as a function of age) within the same UV-bright regions. We compare our results with the ages, masses, and extinction values derived by Kang et al. from integrated UV flux.
Support for this work was provided by NASA through grant GO-12055 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555.

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