Spectral monitoring of powerful radio sources

Details Spectral monitoring of powerful radio sources Spectral monitoring of powerful radio sources

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261....9h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 9-17.

Astronomy and Astrophysics

Astronomy

5

Quasars, Radio Sources (Astronomy), Seyfert Galaxies, Active Galactic Nuclei, Astronomical Spectroscopy, H Beta Line, Spectral Line Width

Scientific paper

High-resolution (about 1.5 A) optical spectra of the wavelength range around H-beta 4861 have been obtained for four quasars (PKS 0736 + 017, 4C 31.45, 3C 263, and 3C 273) and one Seyfert 1 galaxy (3C 120). For three sources, 3C 120, PKS 0736 + 017 and 3C 273, two or more spectra were made at time intervals of 1-1.5 yr. There is evidence for a mild variability of the broad H-beta line in all three objects; this is most marked in the case of 3C 120. Light travel time arguments then infer the dimensions of the BLR to be of the order of a light year or less, assuming the BLR clouds to be spherically distributed.

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