Ultraviolet emission-line variability in 3C273

Details Ultraviolet emission-line variability in 3C273 Ultraviolet emission-line variability in 3C273

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..133o&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 1, 1991, p. 133-137. Research supported by Rut

Astronomy and Astrophysics

Astronomy

10

Emission Spectra, Line Spectra, Lyman Alpha Radiation, Quasars, Ultraviolet Spectra, Active Galaxies, Continuous Spectra, Cross Correlation, Iue, Time Series Analysis

Scientific paper

Evidence is presented for correlated variability between the ultraviolet continuum and the Ly-alpha emission line in the luminous quasar 3C273. Using IUE data covering a period of about 1000 d, Ly-alpha varied by 15 percent, while the continuum varied by a factor of 2. A time series analysis gives a lag for Ly-alpha relative to the UV continuum of 74 + or - 33 d. The broad flat-topped shape of the cross-correlation function, and the small amplitude of the Ly-alpha variability, indicate that the derived lag is a measure of the inner radius of a geometrically thick broad-line region.

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