Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-08
Astronomy and Astrophysics
Astrophysics
36 pages (latex), 7 figures (19 separate gif files for maximum inconvenience), accepted for publication in the August 1999 vol
Scientific paper
We present images taken with the Wide Field Planetary Camera (WFPC-2) on the Hubble Space Telescope of 43 quasars selected from the 3CR radio catalog. The redshift range of the targets is large --- 0.3 < z < 2. These data were taken in the course of a large program that imaged 267 3CR radio galaxies and quasars using the HST in "snapshot mode". Each quasar was centered on the Planetary Camera (PC1) and was imaged through the F702W filter (bandpass similar to Cousins R), typically for 5 and 10 minutes. Our analysis suggests that the quasar fuzz contributes from <5% to nearly 100% in the most extreme case (about 20% being typical) of the total light from the quasar, with 16 of the quasars (~40%) being unresolved according to the analysis of their light profiles (with only 7 being considered unresolved determined by PSF subtraction of the quasar images). Most of the host galaxies show twisted, asymmetric, or distorted isophotes. About 1/4 of the quasar hosts have close (within a few arc seconds) companions seen in projection and about 1/10 show obvious signs of tidal interactions with a close companion. We find that these sources exhibit a tendency for the principal axes of the radio and optical emission to align similar but perhaps weaker than that observed for radio galaxies.
Baum Stefi A.
Biretta John
de Koff Sigrid
Golombek Daniel
Lehnert Matthew D.
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