Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917109p&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #171.09; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
The prevailing model of galaxy assembly predicts that present-day galaxies grew via successive mergers of smaller systems. Thanks to the Galaxy Evolution from Morphology and SEDS (GEMS) survey, a recent, ultra-wide, deep survey conducted with two filters on the Advanced Camera for Surveys aboard the Hubble Space Telescope, we have 8500 high resolution images to use for investigating the merger history of the Universe. We present preliminary results of visual and quantitative classification of 2500 GEMS galaxies across a lookback time of 3.7 Gyr, a time interval spanning 27% of the age of the Universe. We find that the fraction of galaxies with strong morphological distortions, likely resulting from tidal interactions and mergers, changes significantly with lookback time. We also illustrate the critical importance of avoiding bandpass shifting (from rest-frame optical to rest-frame UV) in the classification process. Finally, we discuss the implications of our results for the hierarchical Lambda-CDM model of galaxy evolution.
GEMS Collaboration
Jogee Sharda
Penner Kyle
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