Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254...22m&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 1, 1982, p. 22-37.
Astronomy and Astrophysics
Astrophysics
490
Balmer Series, Black Body Radiation, Galactic Radiation, Quasars, Seyfert Galaxies, Spectrophotometry, Ultraviolet Radiation, Galactic Nuclei, Interstellar Extinction, Paschen Series, Radiant Flux Density, Spectrum Analysis
Scientific paper
A sharp rise from 4000 to 3650 A in the excess flux was obtained when a power-law determined in the red and infrared was subtracted from IR-optical-UV composite spectra of eight Seyfert 1 galaxies and quasars to measure UV excess. The excess is produced by Balmer continuum emission which, relative to H-alpha, is greater than the prediction of Case B recombination by a factor of 1.5-2.5. An additional component from 5000 A to the far-UV was found when the spectra were fitted with combinations of power-law and hydrogen recombination continua. The component is well described by a blackbody at a single temperature ranging from 20,000 to 30,000 K. All of the observed spectra were producible with combinations of power-law, recombination and blackbody emission, and all of the objects in the sample were found to have a power-law component with a slope of -1.1 + or - 0.1.
Malkan Matthew A.
Sargent Wallace L. W.
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