Coordinated X-ray ultraviolet and optical observations of 3C 120

Details Coordinated X-ray ultraviolet and optical observations of 3C 120 Coordinated X-ray ultraviolet and optical observations of 3C 120

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..138m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 138-151. Research supported by the Ministero dell'Un

Astronomy and Astrophysics

Astronomy

45

Seyfert Galaxies, Ultraviolet Astronomy, X Ray Astronomy, Astronomical Models, Light Curve, Line Spectra, Spectral Energy Distribution

Scientific paper

The results are reported of a campaign of Exosat, IUE, and ground-based telescope observations of the Seyfert galaxy 3C 120. The X-ray data show unambiguously that the X-ray spectrum of 3C 120 varies in slope. The spectrum softens when the X-ray intensity increases, but hardens when the medium energy X-ray intensity increases. The average, normalized variability amplitude of the far-UV flux is larger than that of any X-ray band. The UV flux in the 2000-3000 A range is less variable than at shorter wavelengths, suggesting the presence in this band of contributions from emission regions of intermediate size, perhaps intermediate regions of an accretion disk. The optical-UV energy distribution can be described with an optically thick accretion disk plus starlight and Balmer continuum. For the X-ray emission, the observations favor a model in which X-rays arise through Comptonization of soft photons produced in the innermost region of the disk by hot thermal electrons in a surrounding corona.

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