The spectrum of the variable nucleus and surrounding nebulosity of 3C 120

Details The spectrum of the variable nucleus and surrounding nebulosity of 3C 120 The spectrum of the variable nucleus and surrounding nebulosity of 3C 120

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..753f&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 92, Dec. 1980-Jan. 1981, p. 753-757.

Astronomy and Astrophysics

Astronomy

20

Galactic Nuclei, Quasars, Radio Galaxies, Stellar Spectra, Stellar Spectrophotometry, Absorption Spectra, Ionized Gases, Line Spectra, Nonthermal Radiation, Radio Sources (Astronomy), Radio Spectra, Red Shift, Seyfert Galaxies, Star Distribution

Scientific paper

The spectrum of the nucleus of 3C 120 showed major changes in line strengths within a period of less than a year. The most probable interpretation is that the continuum and broad lines decreased in strength by a factor of two while the narrow lines remained constant. The broad lines changed so quickly that they must arise in a region with a size less than approximately 0.2 pc and a density greater than approximately 200,000/cu cm. The spectrum of the nebulosity surrounding the nucleus shows the absorption features of a late-type stellar population at the same redshift as the nucleus. The nebulosity also has strong emission lines which are apparently being excited by a nonthermal continuum, probably leaking out from the nucleus. The ionized gas appears to be oxygen-poor by a factor of four compared to solar abundances, while there is evidence that helium may be overabundant by a factor of 2.5.

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