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J, Melbourne (UCSC), S. Wright (UCLA), D. Le Mignant (WMKO), M. Barczys, J. Larkin (UCLA), C. Max, D. Koo (UCSC)
The Center for Adaptive Optics Treasury Survey (CATS) aims to combine deep HST images in the optical with deep Keck adaptive optics (AO) data in the near-infrared (NIR) to study distant galaxies, AGN, and supernovae. We recently achieved an important new milestone by securing the first high quality Keck laser guide star (LGS) AO image of faint galaxies. Six galaxies with redshifts ranging from 0.3-1.0 were targeted in one pointing in the GOODS-S field. Two are Chandra sources with complex morphologies suggestive of recent merger activity. Substructures seen in the NIR AO image, including the double nucleus of one Chandra source and multiple tight knots in another, are confirmed in the optical HST images (both about 0.1" FWHM) but are undetected in very deep, ground-based NIR images from ESO with seeing about 0.5" FWHM. We will present results on the stellar populations of the substructures as derived from photometry of the galaxy subcomponents using the NIR AO data and the optical HST data taken with four ACS filters.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.