Multifrequency observations of the optically active radio-quiet quasar GQ Comae. I - Ultraviolet continuum and line variability

Details Multifrequency observations of the optically active radio-quiet quasar GQ Comae. I - Ultraviolet continuum and line variability Multifrequency observations of the optically active radio-quiet quasar GQ Comae. I - Ultraviolet continuum and line variability

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...72..777s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 72, April 1990, p. 777-796.

Astronomy and Astrophysics

Astrophysics

4

Active Galactic Nuclei, Quasars, Ultraviolet Spectra, Astronomical Spectroscopy, Iue, Lyman Alpha Radiation, Spectral Line Width

Scientific paper

This paper summarizes the data and preliminary results of a three-year project to monitor the continuum variability of GQ Com in the satellite ultraviolet and the associated variability of the Ly-alpha and C IV lines. GQ Com exhibited a twofold increase in flux during a 100-day time span, followed by a decline taking over three times longer. The broad wings of C IV responded quickly to the continuum increase, although the coarseness of the time resolution allows only an upper limit of 50 days to be placed on any time delay between the continuum and the line wings. The response of the wings of Ly-alpha is not as well defined. In contrast, the cores of both lines lagged the continuum by at least 50-100 days. During the course of the observations, the Ly-alpha line profile underwent considerable changes in shape. The profile changes were also seen in C IV on one occasion. These changes occurred while the continuum was in a low state. The data indicate considerble structure may be present in the broad-line region.

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