HST Morphology and Light-Profiles of Field Galaxies Surrounding Distant Radio Sources

Details HST Morphology and Light-Profiles of Field Galaxies Surrounding Distant Radio Sources HST Morphology and Light-Profiles of Field Galaxies Surrounding Distant Radio Sources

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.6507g&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #65.07; Bulletin of the American Astronomical Society, Vol. 24, p.1222

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Scientific paper

We present the HST/WFC morphology and the isophotal profiles of faint field galaxies with known redshifts in the range 0.1---0.7. These were found in deep (80--240 min) HST Cycle 1 images of distant radio galaxies (z=0.31--2.39) in both the WFC V and I filters. First, we carefully removed the effects of bad pixels and cosmic-ray events from the WFC images, and made a PSF-library across the WFC field-of-view from Cycle 1 images (see our other HST AAS posters in this Volume). Photon-preserving deconvolution of the WFC image-stacks was done with the Richardson-Lucy and the multi-resolution CLEAN (``MRC'') methods (Wakker & Schwartz 1988 A&Ap 200, 312; Keel 1991 PASP 103, 723; Windhorst, Mathis & Keel 1992 ApJ Letters 400, in press). The deconvolved images have FWHM<=0.2'', dynamic range of at least 15--20 dB, a 6sigma point-source sensitivity (with spherical aberration) of ~ 25.4 mag in V and ~ 23.7 mag in I, and a 1-sigma surface brightness sensitivity of ~ 27.0 mag/arcsec(-2) in V and ~ 25.5 in I. Both deconvolution methods yield meaningful galaxy images in multi-orbit HST exposures (see our other HST AAS-posters in this Volume), and allow us to trace morphology and light-profiles of galaxies down to V =~ 24-24.5 mag. We present the isophotal profiles of faint field galaxies with measured redshifts in the range z=0.1---0.7. Most field galaxies consist typically of a small inner bulge that follows a r(-1/4) -law down to 0.1'' resolution, plus a dominant surrounding exponential disk. They are mostly field spirals. We also measure their bulge-to-disk ratios. There are a couple of pure r(-1/4) -like light-profiles (field ellipticals), and a few S0's. This work was supported by NASA/HST grants GO-2405-01-87A (to both RAW and WCK) from STScI, which is operated by AURA, Inc., under NASA contract NAS5-26555, and by the Alfred P. Sloan Foundation (to RAW).

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