Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-12
Astrophys.J.Suppl.172:38-45,2007
Astronomy and Astrophysics
Astrophysics
21 pages, 6 figures -- to appear in COSMOS ApJ Suppl. special issue
Scientific paper
10.1086/516580
The Cosmic Evolution Survey (COSMOS) was initiated with an extensive allocation (590 orbits in Cycles 12-13) using the Hubble Space Telescope (HST) for high resolution imaging. Here we review the characteristics of the HST imaging with the Advanced Camera for Surveys (ACS) and parallel observations with NICMOS and WFPC2. A square field (1.8$\sq$\deg) has been imaged with single-orbit ACS I-F814W exposures with 50% completeness for sources 0.5\arcsec in diameter at I$_{AB} $ = 26.0 mag. The ACS imaging is a key part of the COSMOS survey, providing very high sensitivity and high resolution (0.09\arcsec FWHM, 0.05\arcsec pixels) imaging and detecting 1.2 million objects to a limiting magnitude of 26.5 (AB). These images yield resolved morphologies for several hundred thousand galaxies. The small HST PSF also provides greatly enhanced sensitivity for weak lensing investigations of the dark matter distribution.
Benson Andrew
Blain Andrew W.
Calzetti Daniela
Capak Peter
Carilli Chris
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