[6.13] Normal Galaxies and Mergers: The Morphological Mix of Galaxies to z~1 From GOODS ACS Imaging of the Chandra Deep Field-South

AAS 201st Meeting, January, 2003
Session 6. The GOODS and Those HEROs
Poster, Monday, January 6, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[6.13] Normal Galaxies and Mergers: The Morphological Mix of Galaxies to z~1 From GOODS ACS Imaging of the Chandra Deep Field-South

R. A. Lucas (STScI), C. Conselice (Caltech), E. Chatzichristou (Yale), T. Dahlen (STScI), D. de Mello (JHU), J. P. Gardner (GSFC), M. Giavalisco (STScI), N. A. Grogin, A. Hornschemeier (JHU), S. Jogee, A. M. Koekemoer, B. Mobasher, S. Ravindranath (STScI), C. M. Urry (Yale), GOODS Team

We present morphological CAS (concentration, asymmetry, and clumpiness) parameters out to z~1 for galaxies in an area covering and surrounding the CDF-S which we are imaging in 4 bands (B,V,i,z) with the ACS Wide Field Camera. These parameters will allow us to determine, based on a nearby galaxy calibration, the similarities between each galaxy and the various major types. We will focus in particular on the morphological mix in the redshift-limited sample, with a special emphasis on the evolution in the fraction of interactions and mergers with redshift. To do this, we will first calculate rest-frame B-band morphologies for the galaxies brighter than a given magnitude limit. From this, and using a local calibration, the morphological mix (fraction of mergers, late types, and early types) can be computed as a function of redshift. It should also be possible to track changes in the parameter values themselves as a function of redshift, and this can be used to assess their implications for the morphological mix. Other relations between variables such as spectral type (from our photometric redshift catalogs) and the degree of asymmetry can also be used to probe questions such as the relationship between starburst galaxies and mergers, for example.

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The author(s) of this abstract have provided an email address for comments about the abstract: lucas@stsci.edu

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