The spectral properties of quasars

Details The spectral properties of quasars The spectral properties of quasars

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.134...35y&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 134, no. 1, June 1987, p. 35-45.

Astronomy and Astrophysics

Astrophysics

2

Quasars, Spectrum Analysis, Visible Spectrum, Luminosity, Red Shift, Synchrotron Radiation, Tables (Data)

Scientific paper

Optical spectral indices of 314 quasars are presented. They are found to cluster around α0= -0.5. These together with 73 optical spectral indices from Richstone and Schmidt form the author's data set. He has found that the optical spectral indices have a significant correlation with the redshifts while they have no correlation with the optical luminosities. The sharp cut-off near α0= 1/3 claimed by Richstone and Schmidt is not seen. Instead a cut-off near α0= 5/2 is indicated. This may be interpreted as an evidence of an optically thick synchrotron source in the Rayleigh-Jeans limit in which the emitted spectrum has an index of 5/2.

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