Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21723305w&link_type=abstract
American Astronomical Society, AAS Meeting #217, #233.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We present a measurement of the age distribution of stars residing in nearby spiral disks and dwarf galaxies. With these measurements, we estimate a complete star formation history of the 140 Mpc3 covered by the volume-limited sample of galaxies in the Advanced Camera for Surveys (ACS) Nearby Galaxy Survey Treasury (ANGST). Our sample allows us to separate the contributions by galaxy type. The total star formation rate density history is dominated by the large spirals in the volume, although the sample consists mainly of dwarf galaxies. In all galaxy types, our measurement shows a factor of 3 drop in star formation rate density at z 2, in approximate agreement with results from other measurement techniques. Differences in the detailed results of our analysis and those of redshift surveys will be discussed. ANGST is supported by HST GO-10915 administered by NASA.
Dalcanton Julianne J.
Dolphin Andrew
Gilbert Karoline
Johnson Clifton L.
Seth Aaditeshwar
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