Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21723301v&link_type=abstract
American Astronomical Society, AAS Meeting #217, #233.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
We present a multiwavelength study of rest-frame far-ultraviolet (FUV) selected galaxies at intermediate redshifts (0.1 < z < 1) in the GOODS-N & -S fields. The HST data analyzed were taken with ACS, WFPC2, and WFC3 spanning from FUV to near-infrared bands. The galaxy sample is analyzed in bins of specified time to facilitate comparisons with predictions from theory and simulations of timescales for merger events and morphological transformation in secular evolution scenarios. Quantitative rest-frame i-band morphologies from GALFIT are compared with SED based spectral types revealing trends between morphology and star-formation at intermediate redshifts. Sizes of star-forming clumps are also measured in the rest-frame FUV data for different morphologies to test for size evolution which could be an indication of disk or bulge build-up. We compare morphologies of the star-forming sample to those of a large non-FUV selected galaxy sample in the GOODS-N & -S fields over the same redshift ranges to pinpoint significant morphological differences. We also compare with a local sample obtained from the Sloan Digital Sky Survey representing the local Hubble sequence. The FUV sample is used to measure faint end number counts and the resolved background contribution, covering a larger area (15.9 square arcmin.) than previously observed at these wavelengths (1614Å) and magnitudes (20.5-29.5). Our results are in good agreement with recent semi-analytical models based on dark matter "merger trees” (Somerville et al. 2008, Gilmore et al. 2009) and suggest that other HST studies using smaller detection areas have over-predicted the number counts.
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