Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..400h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 15, 1983, p. 400-410.
Astronomy and Astrophysics
Astronomy
40
Astronomical Spectroscopy, Galactic Nuclei, Infrared Astronomy, Optical Emission Spectroscopy, Quasars, Radio Sources (Astronomy), Emission Spectra, Line Spectra, Luminosity
Scientific paper
Infrared multicolor (JHKLN) photometry and optical spectrophotometry of a sample of bright (mv less than or = 18) galaxies with powerful compact nuclear radio sources (S greater than or = 200 mJy at 5 GHz) are presented. Nearly all of the objects (85 percent or more) have a nonstellar optical-infrared nuclear continuum whose strength is roughly proportional to that of the compact radio source. Except for their lower luminosities, the nuclei in these galaxies probably resemble radio-loud quasars. Compact nuclear radio sources with associated large-scale double radio lobes probably have enhanced nonstellar optical-infrared continua compared to the objects without such extended radio emission. The sample is diverse in its emission-line properties. Generally, the radio-loud objects have much stronger emission lines than do the nuclei of normal (radio-quiet) early-type galaxies.
Breugel Wil van
Heckman Timothy M.
Lebofsky Marcia J.
Rieke George H.
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