Unravelling the Morphologies of Luminous Compact Galaxies Using the HST/ACS GOODS Survey

Details Unravelling the Morphologies of Luminous Compact Galaxies Using the HST/ACS GOODS Survey Unravelling the Morphologies of Luminous Compact Galaxies Using the HST/ACS GOODS Survey

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380..541r&link_type=abstract

At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o

Mathematics

Logic

Scientific paper

Luminous Compact Galaxies (LCGs) (M_B ≤ -20, R1/2 ≤ 4.5 kpc and EW0(OII) ≥15Å) constitute one of the most rapidly evolving galaxy populations in the last ˜8 Gyr history of the universe. Due to their inherently compact sizes, detailed determinations of their morphology have been hard to come by. Hence, the morphologies and thereby the local counterparts of these enigmatic sources have been hotly debated. We make use of the full 5-epoch v1.0 high angular resolution, deep, multiband HST/ACS imaging data, from the CDFS half of the HST/ACS GOODS survey, to study the quantitative morphology of a complete sample of LCGs out to a redshift of 1.2. Structural parameters are derived for these LCGs using full 2-dimensional surface brightness profile fitting of the galaxy images in each of the four filters available. B-z color maps are constructed for the entire sample of LCGs to aid in the morphological classification. We then use the rest frame B band bulge fraction B/T to quantify the morphological class of these galaxies. We make use of the Spitzer 24 micron source catalog of sources in the CDFS to derive the dust enshrouded Star Formation Rates (SFR) for some of our LCGs yielding SFR values ranging from a few to ˜65 M&sun;/year as expected for this class of objects. We also estimate a factor ˜11 fall in the comoving number density of blue LCGs from redshifts 0.5 ≤ z ≤ 1.2 to the current epoch. Finally, we report the quantitative morphological mix that we find for these LCGs at intermediate redshifts. We discuss the ramifications of the morphological mix of LCGs that we find from our work and clues that it might hold regarding the local counterparts of these objects.

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