Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........28d&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, BERKELEY, 1994.Source: Dissertation Abstracts International, Volume: 56-05, Section: B
Computer Science
3
Scientific paper
A spectacular demonstration of the link between galaxy activity and the host galaxy's global properties is the "alignment effect": high redshift radio galaxies (z > 1) have complex UV morphologies that are aligned with the major axis of their radio emission. My thesis research is focused on understanding the alignment effect by (1) identifying low redshift (z < 0.2) radio galaxies which exhibit the alignment effect, and (2) directly studying the extended, aligned UV continuum emission in high redshift radio galaxies using W. M. Keck Telescope and the refurbished Hubble Space Telescope. We present the results of a continuum imaging survey of a sample of low redshift radio galaxies (0.08 < z < 0.2). We have discovered spatially extended UV continuum emission distributed along the radio axis in {~}30% of the radio galaxies in the sample. The alignment effect in low redshift radio galaxies has a variety of origins. In most low redshift radio galaxies the aligned continuum light is nonstellar, although there is evidence for jet induced star formation in at least one low redshift radio galaxy. Using the Keck telescope, we have discovered that the distant radio galaxy 3C265 (z = 0.81) contains a buried quasar. The off-nuclear spectrum of the extended continuum of this galaxy shows a broad component of the MgII emission line--a feature characteristic of quasar spectra. These data provide critical confirmation that scattering of nuclear AGN light must be responsible for the alignment effect in some galaxies, and in addition support AGN unification models. The velocity structure of the emission lines permits a determination of the mass of this high redshift galaxy. We also present recent Keck spectroscopic and HST WFPC2 imaging polarimetric observations of the prototypical aligned high redshift radio galaxy 3C368 at z = 1.132. Finally, we discuss the nature of the alignment in the most distant galaxy currently known, 8C1435+63 at z = 4.25.
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