Intranight optical variability in optically selected QSOs

Gopal-Krishna, ; Ram Sagar, ; Wiita, Paul J. (1995) Intranight optical variability in optically selected QSOs Monthly Notices of the Royal Astronomical Society, 274 (3). pp. 701-710. ISSN 0035-8711

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We report results from a continuing programme to search for intranight optical variability in one radio-moderate and six radio-quiet (but all optically bright and luminous) quasi-stellar objects, using the 2.34-m Vainu Bappu Telescope. Our data clearly show microvariability for the radio-moderate QSO, 0838+359, and provide strong indications of microvariability for two of the radio-quiet QSOs, 0946+301 and 1049-006, and possibly also for a third, 1206+459. Additional observations of these and other QSOs could provide a powerful means of discriminating among various theoretical mechanisms proposed for the energy source and, in particular, the origin of optical microvariability in active galactic nuclei. These apparent detections of microvariability in radio-quiet QSOs seem to favour models where flares on accretion discs are responsible for the microvariability.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Accretion; Accretion Discs; Galaxies: Active; Galaxies: Photometry; Quasars: General
ID Code:65716
Deposited On:17 Oct 2011 10:36
Last Modified:11 Jul 2012 09:51

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