Merging Galaxies in Goods-s: First Extragalactic Results from Keck Laser Adaptive Optics
| Autor: | Claire E. Max, Douglas M. Summers, D. Le Mignant, Jennifer M. Lotz, M. A. van Dam, R. Lafon, Erik M. Johansson, Jason Melbourne, Paul J. Stomski, Shelley A. Wright, Deanna Marie Pennington, Matthew Barczys, Jason C. Y. Chin, Peter Wizinowich, David C. Koo, A. H. Bouchez, S. K. Hartman, James E. Larkin |
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| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Physics
Active galactic nucleus Stellar population Star formation Astrophysics (astro-ph) FOS: Physical sciences Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Galaxy merger Astrophysics 01 natural sciences Redshift Galaxy Laser guide star Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010306 general physics Adaptive optics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Popis: | 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 Keck laser guide star 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 Deep Field South sources, XID-56 and XID-536, with complex morphologies suggestive of recent merger activity. Substructures seen in the NIR AO image (FWHM ~ 0.1"), including multiple tight knots in XID-56 and a double nucleus in XID-536, are confirmed in the optical HST images. These structures are unresolved in the best seeing-limited (FWHM ~ 0.5") NIR images. Stellar population synthesis models of the substructures indicate that XID-56 is a gas rich merger with a recent burst of star formation and significant amounts of dust. XID-536 appears to be a merger of two evolved stellar populations. 6 pages, 4 figures, 1 table, accepted ApJL 2005 |
| Databáze: | OpenAIRE |
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