Mathematics – Logic
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........20r&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF HAWAII, 1995.Source: Dissertation Abstracts International, Volume: 57-01, Section: B, page: 0394.
Mathematics
Logic
1
Redshift
Scientific paper
We present the results of a HST and ground-based imaging study of a complete sample of z~1 5 3C quasars and 5 3C galaxies. We have obtained deep WFPC2 rest-frame UV and deep rest-frame 1 μm images of this sample. We resolve continuum structure around all of our quasars in the high resolution WFPC2 images, and are able to resolve some nebulous structure in all but one of the near-infrared images. Four of the quasars have some optical structure that is aligned with the radio axis or is directly coincident with the radio structure. The total optical and K^' magnitudes of the quasars is consistent with those of the radio galaxies within the observed dispersion in our sample. The distributions of K^' magnitudes of both radio galaxies and quasars exhibit similar mean and dispersion as that found for other radio galaxies at this redshift. We see morphological evidence of interactions in our objects; in one, we may see a tidal tail. We see very blue and/or edge-brightened structures that lie within the probable quasar opening angle; these are likely the result of illumination effects from the active nucleus, i.e. scattered quasar light or photoionization. In 3C 212, we see an object that lies beyond the radio lobe that looks morphologically quite similar to a radio hotspot and tail; this object is bright in the infrared and has a steep spectral gradient across the tail. We have detected an optical counterpart to a radio jet in the quasar 3C 245, and an optical counterpart to a radio lobe in 3C 2. Both of these structures have such a high -resolution, point-to-point correspondence with the radio structures that they are very likely the result of optical synchrotron radiation. The spectral indices in 3C 2 are consistent with this hypothesis. Based on the correspondence between the total magnitudes in the radio galaxies and quasars, and the first detection of aligned components in quasars, we conclude that this study provides general support for the unification hypothesis of radio galaxies and quasars. However, there seem to be significant morphological differences between the aligned structure in the two samples. The extension around the quasars in some cases is likely due to stars, and in others is almost certainly optical synchrotron emission.
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