The Star Formation History of Early-Type Galaxies

Details The Star Formation History of Early-Type Galaxies The Star Formation History of Early-Type Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9707b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #97.07; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Scientific paper

The formation and evolution of elliptical galaxies is an unsolved problem in galaxy astrophysics. One fundamental constraint on any theoretical model is the star-formation history of elliptical galaxies. We analyze SDSS optical spectra in conjunction with GALEX UV photometry. Using constraints on color, Sersic index, minor to major axis ratio and surface brightness, we target red, elliptical galaxies in the SDSS. We visually verify that this leads to a contamination by S0 and disk galaxies of < 5%.
Then, we match this sample to the GALEX catalog to utilize information from both wavelength ranges.
Before comparing our galaxies to Bruzual-Charlot (BC03) models, we average spectra in different luminosity bins to increase our signal to noise ratio. We then use BC03 models to test several possible star formation histories, including those with and without current star formation, and find the star formation history that best fits the data and the optical spectroscopy and UV photometry together.
Our results show that the UV data highly constrain the possible star formation histories. The UV fluxes put very strong upper bounds on on-going star formation rates.

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