Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21111101e&link_type=abstract
American Astronomical Society, AAS Meeting #211, #111.01; Bulletin of the American Astronomical Society, Vol. 39, p.940
Other
Scientific paper
Motivated by the increasing use of the Kennicutt-Schmidt (K-S) star formation law to interpret observations of high redshift galaxies, the importance of gas accretion to galaxy formation, and the recent observations of chemical abundances in galaxies at z˜2-3, I will use simple analytical models to assess the consistency of these processes of galaxy evolution with observations and with each other. Using the explicit time dependence of star formation implied by the K-S law, I will show that the sustained high star formation rates observed in galaxies at z˜2-3 require the accretion of additional gas. A model in which the gas accretion rate is approximately equal to the combined star formation and outflow rates broadly reproduces the observed trends of star formation rate with galaxy age. Using an analytical description of chemical evolution, I will also show that this model, further constrained to have an outflow rate roughly equal to the star formation rate, reproduces the observed mass-metallicity relation at z˜2.
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