The starburst-AGN connection - A sensitive VLBI survey of luminous IRAS galaxies

Details The starburst-AGN connection - A sensitive VLBI survey of luminous IRAS galaxies The starburst-AGN connection - A sensitive VLBI survey of luminous IRAS galaxies

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405l...9l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 405, no. 1, p. L9-L12.

Astronomy and Astrophysics

Astronomy

88

Active Galactic Nuclei, Galactic Radiation, Infrared Sources (Astronomy), Radio Astronomy, Starburst Galaxies, Very Long Base Interferometry, Cosmology, Galactic Evolution, Star Formation, Stellar Luminosity, Stellar Spectra

Scientific paper

Results of an 18 cm VLBI survey of 31 luminous, radio-compact IR galaxies are presented. Over half the sample galaxies show high-brightness temperature emission, with Tb greater than 10 exp 5 K and structure on scales of 5-150 mas. The limits for nondetected sources are similar, consistent with a picture in which most of these galaxies have compact cores at a level of a few percent of the total radio flux density. Characteristics of the extended radio structure, infrared properties, and optical excitation are not good indicators of the detectability of VLBI-scale emission. Structural information and energetic considerations rule out a single supernova interpretation of the compact emission in these galaxies, although we cannot exclude the possibility of several simultaneous extraordinarily luminous radio supernovae within the central few hundred cubic parsec. Our results instead favor the presence of an AGN obscured by starburst-related dust.

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