The morphological evolution of distant galaxies from the ACS/WFC UDF parallel observations

Details The morphological evolution of distant galaxies from the ACS/WFC UDF parallel observations The morphological evolution of distant galaxies from the ACS/WFC UDF parallel observations

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20313102m&link_type=abstract

American Astronomical Society Meeting 203, #131.02; Bulletin of the American Astronomical Society, Vol. 35, p.1416

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We present a detailed morphological analysis of distant field galaxies using the extremely deep ACS images from the public UDF-NICMOS parallel observations obtained in the F435W (B), F606W (V), F775W (i) and F850LP (z) filters. We segregate galaxies according to the Hubble scheme using a combination of visual classifications and objective machine based analysis. We use the bulge-to-disk (B/D) ratio as well as the Asymmetry (A) and Central Concentration (C) parameters to characterize galaxies up to iAB ˜ 26 mag. We compute galaxy number counts as a function of morphological type and compare our results with those in the HDF-North and the model predictions from different PLE models. We take advantage of the multi-color dataset and estimate redshifts for our sample using the Bayesian photometric redshift (BPZ) which enables us to construct redshift distributions for the whole sample as well as a function of morphology. Finally, using stellar population synthesis models and a maximum likelihood approach, we compute the star-formation rate (SFR) for galaxies up to z ˜ 1 for different morphological types. We discuss our results in the context of galaxy formation models from number counts, redshift distributions and SFR. ACS was developed under NASA contract NAS 5-32864, and this research is supported by NASA grant NAG5-7697.

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