Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..125u&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 125-132.
Other
22
Active Galactic Nuclei, Continuous Radiation, Light Curve, Lyman Alpha Radiation, Quasars, Seyfert Galaxies, Ultraviolet Radiation, Emission Spectra, Iue, Line Spectra, Variability
Scientific paper
This article presents the light curve of the ultraviolet continuum flux and of the Ly-alpha emission line of 3C 273 between 1978 and 1992.5. It also presents evidence for a quantitative difference between nearby Seyfert 1 and the quasar 3C 273 regarding the response of the emission lines to UV continuum flux variations. In contrast to what is observed in nearby Seyfert galaxies, the Ly-alpha line in 3C 273 does not significantly respond to flux variations of the continuum by a factor two. The largest excursion of the Ly-alpha intensity is no more than 8 percent from the local mean, while the 1 sigma error on the Ly-alpha intensity is 5 percent. The near-constancy implies a different distribution (or different physical conditions) of the Ly-alpha emitting gas in 3C 273 on the one hand and in nearby Seyfert 1 galaxies on the other. It points to the near-absence in 3C 273 of Ly-alpha emitting gas located at less than c Delta t from the continuum source, Delta t being the characteristic time scale of the continuum variations. The properties of Ly-alpha in 3C 273 are compared to those in other intrinsically bright quasars.
Courvoisier Thierry J. -L.
Ulrich Marie-Helene
Wamsteker Willelm
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