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2000MNRAS.317..120R - Mon. Not. R. Astron. Soc., 317, 120-140 (2000/September-1)
Optical/ultraviolet morphology and alignment of low-redshift radio galaxies.
ROCHE N. and EALES S.A.
Abstract (from CDS):
In six out of 15 radio galaxies, the optical structure is closely (within 12°) aligned with the radio axis. Three of these, which are the most radio-luminous galaxies in our sample, show an alignment of their optical long axis. The other three <12° alignments appear to be produced by merging companion galaxies at position angles close to the radio axes. In five galaxies, the radio axes and the projected position angles of the interacting pairs coincide within 21°, and there is evidence that the radio jet interacts with the companion. As we estimate that only one such alignment would occur by chance in our sample, this may be evidence for a second type of alignment effect produced by companion galaxies. For the cluster cD galaxy 3C 348, we find some evidence that the distribution of cluster galaxies is aligned with the radio axis.
Most (10 out of 15) of the radio galaxies have optical half-light radii consistent with the size-luminosity relation of local radio-quiet early-type galaxies, the exceptions being three known cluster cDs, which have larger radii than normal ellipticals, and the two galaxies at the highest redshifts, which are ∼0.8mag more luminous than expected for their size. Most (13 out of 15) have radial profiles best fitted by a bulge [exp(-rre)0.25] model, but two are closer in a χ2 test to an exponential profile. One of these, 3C 285, appears sufficiently well-imaged to be classified as a disc galaxy and shows evidence of a previous merger on a polar axis.
Abstract Copyright: 2000, Royal Astronomical Society
Journal keyword(s): galaxies: active - galaxies: interactions - ultraviolet: galaxies
Nomenclature: Text, Figs: [RE2000] 3C NNN GN N=17, [RE2000] 3C NNN HN N=2.
Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.
Simbad objects: 21
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