Blue Continuum Snapshots of 3CR Radio Galaxies
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Radio continuum observation of the cluster of galaxies A1367 obtained at 1.4 GHz with the VLA in various configurations are combined in this work to produce a radio map of the central region of the cluster with an rms noise of 0.13 mJy. Using a digitized plate of the region on which all spiral+Irr galaxies with B <18.0 are selected, we find that 19 radio sources are identified with late-type galaxies, 9 of which were previously unknown. By determining the frequency distribution of the radio/optical and radio/IR ratio of galaxies in A1367 we confirm previous claims that spiral galaxies with a high radio/optical ratio in this cluster are ~10 times more frequent than in a reference sample of "field" galaxies of similar morphological type and similar distance.
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view Abstract Citations (497) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Correlation between the Radio and Optical Morphologies of Distant 3 CR Radio Galaxies McCarthy, Patrick J. ; van Breugel, Wil ; Spinrad, Hyron ; Djorgovski, S. Abstract The discovery of a strong correlation between the radio and optical morphologies of distant (z equal or greater than 0.6), powerful radio galaxies is reported. The isophotal axes of highly elongated distant 3CR galaxies, measured both in the light of stellar continua and extranuclear emission lines, tend to align with the radio source axes. This correlation suggests that there is a profound relation between these extremely powerful radio sources and their host galaxies. The most natural explanation of the effect is that the radio jets and/or backflows from the radio lobes interact with the interstellar media of the gas-rich galaxies associated with 3CR sources and stimulate large-scale star formation. This mechanism can provide a physical explanation for the high star formation and evolution rates of 3CR galaxies at large look-back times found in earlier photometric studies. Thus the formation and evolution of powerful radio galaxies and radio-quiet giant ellipticals may differ substantially. Publication: The Astrophysical Journal Pub Date: October 1987 DOI: 10.1086/185000 Bibcode: 1987ApJ...321L..29M Keywords: Astronomical Models; Galactic Evolution; Morphology; Radio Galaxies; Radio Spectra; Visible Spectrum; Emission Spectra; Interstellar Gas; Radio Jets (Astronomy); Spectrum Analysis; Star Formation Rate; Astrophysics; COSMOLOGY; GALAXIES: FORMATION; GALAXIES: JETS; GALAXIES: STRUCTURE; RADIO SOURCES: GALAXIES; RADIO SOURCES: GENERAL full text sources ADS | data products NED (29) SIMBAD (27)
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