Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733505j&link_type=abstract
American Astronomical Society, AAS Meeting #217, #335.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Using cosmological hydrodynamic simulations, we find good consistency between the simulations and observed photometric properties of z=9 to z=6 galaxies, such as the color-color diagrams and rest-frame UV luminosity function. By performing a fit to the Schechter luminosity function we find an evolving faint-end luminosity slope of -2.00 and steeper for z=6 to z=9, suggesting a significant population of small faint galaxies which are currently beyond our observational limits. Motivated by our concurrence with the observed photometric properties, we explore the duty cycle, star formation histories (SFH) and number densities of these high-z galaxies. We find that although individual galaxies have bursty SFH, the mean SFH show a clear exponentially increasing SFH with time-scales ranging from 70 Myr to 200 Myr for galaxies with Mstar=106 to 1010 Msun. We also calculate the duty cycle of star formation above an observable star formation threshold, and find that it makes a steep transition from zero to unity between Mstar=107 to 109 Msun.
Choi Jaedong
Jaacks Jason
Nagamine Kentaro
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