Other
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..963g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 4, p. 963-969.
Other
33
Active Galaxies, Optical Properties, Quasars, Stellar Luminosity, Astronomical Photometry, Variability
Scientific paper
We report results from a new program, using the 2.34-m Vainu Bappu Telescope, to search for intra-night optical variability in five QSOs which are radio-quiet but optically bright and luminous. Our limited data show mild indications of microvariability for some of the sources, but in no case has the reality of the fluctuations been clearly established. Additional observations of these and other QSOs could provide a powerful means of discriminating between various theoretical mechanisms proposed for the origin of optical microvariability in active galactic nuclei. Clear detections of microvariability in radio-quiet QSOs would favor models in which flares on accretion discs are responsible for the microvariability, while a demonstration that such fluctuations are extremely rare would support models based on shocks propagating down the relativistic jets which are only associated with radio-loud active galactic nuclei.
Gopal-Krishna
Sagar Ram
Wiita Paul J.
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