Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-13
Astronomy and Astrophysics
Astrophysics
61 pages including 28 figures and 1 table. 500KB .ps.gz 2.7MB gunzip Accepted for AJ July 1999. MDS database Primary reference
Scientific paper
Quantitative morphological and structural parameters are estimated for galaxies detected in HST observations of WFPC2 survey fields. A modeling approach based on maximum likelihood has been developed for two-dimensional decomposition of faint under-sampled galaxy images into components of disk and bulge morphology. Decomposition can be achieved for images down to F814W (I) \~23.0, F606W (V) ~23.8 and F450W (B) ~23.3 magnitudes in WFPC2 exposures of one hour. We discuss details of the fitting procedure, and present the observed distributions of magnitude, color, effective half-light radius, disk and bulge axis ratios, bulge/(disk+bulge) flux ratio, bulge/disk half-light radius ratio and surface brightness. We also discuss the various selection limits on the measured parameters. The Medium Deep Survey catalogs and images of random pure parallel fields and other similar archival primary WFPC2 fields have been made available via the Internet with a searchable browser interface to the database at http://archive.stsci.edu/mds/
Griffiths Richard E.
Ostrander Eric J.
Ratnatunga Kavan U.
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