Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...28...89u&link_type=abstract
Space Science Reviews, vol. 28, no. 1, 1981, p. 89-104.
Astronomy and Astrophysics
Astronomy
28
Gamma Ray Spectra, Quasars, Spaceborne Astronomy, Spectrum Analysis, Ultraviolet Spectra, X Ray Spectra, Absorption Spectra, Black Body Radiation, Emission Spectra, Galactic Nuclei, H Lines, Iron, Line Spectra, Optical Thickness, Position (Location), Seyfert Galaxies, Spectral Energy Distribution, X Ray Absorption
Scientific paper
The most salient results of recent satellite observations of the overall electromagnetic spectrum of 3C 273 in the gamma-ray, X-ray and UV ranges are: (1) the energy per decade of frequency emitted by the source is nearly constant between 6000 A and 500 MeV and is roughly 20 x 10 to the 46th erg/sec for H = 50 km/sec/Mpc; (2) there is not absorption in the soft X-ray range, in contrast to the X-ray spectrum of Seyfert nuclei; and (3) the optical and UV spectra cannot be fitted by power-law spectra only, and the energy distribution in this range suggests that a substantial portion of the energy in the UV is emitted as black-body radiation at 20,000 K. If the peculiar shape of the UV spectrum is caused by black-body radiation, an estimate of the energy emitted under this form is 2.5 x 10 to the 46th erg/sec; this corresponds to an optically thick disk of roughly 10 to the 16th cm in diameter.
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