The variability of the spectrum of Arakelian 120

Details The variability of the spectrum of Arakelian 120 The variability of the spectrum of Arakelian 120

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..926p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 88, July 1983, p. 926-933.

Other

33

Continuous Spectra, Emission Spectra, H Beta Line, Seyfert Galaxies, Spectral Line Width, Ubv Spectra, Brightness Distribution, Forbidden Bands, Periodic Variations, Photoionization, Radiant Flux Density, Spectrophotometry

Scientific paper

New spectroscopic and photometric observations of the variable Seyfert 1 galaxy Arakelian 120 are presented. These data are supplemented with published data from other sources. It is shown that Akn 120 exhibits both short-term and long-term variability, as do other Seyfert galaxies. The flux in the broad H-beta emission line closely follows the optical continuum flux, which provides strong support for photoionization models and implies that the broad-line emitting region is very small (less than approximately 0.04 pc in extent).

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