Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-02-24
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Science white paper submitted to Astro2010 Decadal Survey GAN Panel 7 pages + cover page, 2 figures
Scientific paper
The resolved stellar populations of local galaxies, from which it is possible to derive complete star formation and chemical enrichment histories, provide an important way to study galaxy formation and evolution that is complementary to lookback time studies. We propose to use photometry of resolved stars to measure the star formation histories in a statistical sample of galaxy disks and E/S0 galaxies near their effective radii. These measurements would yield strong evidence to support critical questions regarding the formation of galactic disks and spheroids. The main technological limitation is spatial resolution for photometry in heavily crowded fields, for which we need improvement by a factor of ~10 over what is possible today with filled aperture telescopes.
Olsen Knut A. G.
Romanowsky Aaron J.
Saha Abhijit
Skillman Evan
Williams Benjamin F.
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