Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..629l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. 629-650. Research sponsored by NSF.
Astronomy and Astrophysics
Astronomy
39
Active Galactic Nuclei, Brightness Temperature, Galactic Radio Waves, Starburst Galaxies, Very Long Base Interferometry, Cosmic Dust, Galactic Nuclei, Radio Sources (Astronomy), Very Large Array (Vla)
Scientific paper
Results are presented of Mk III 18-cm VLBI observations of a small sample of IR-bright galaxies: four starburst galaxies which have no evidence of an AGN from the optical spectrum, two Seyfert 2 galaxies, and one previously unclassified Markarian galaxies. In Mrk 297 the compact radio source lies in an obscure clump near the edge of the galaxy. This is either the first known case of a detached nucleus (presumably as a result of disruption during a merger) or a radio supernova of unprecedented luminosity. No VLBI-scale emission was detected in the nucleus of the starburst galaxy Mrk 201 or in Mrk 928a, although the Seyfert 2 nucleus Mrk 928b was detected. Mrk 620 was found to have a milliarcsecond core, but Mrk 520 was not detected. Optical spectroscopy was obtained for five galaxies, including Mrk 520. It is demonstrated that, in luminous starburst galaxies, an active nucleus can effectively be completely hidden from view in the optical by dust. The results also support a physical or causal connection between classical nuclear activity and the starburst phenomenon.
Lonsdale Carol J.
Lonsdale Colin J.
Smith Harding E.
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