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Title: Further evidence for intra-night optical variability of radio-quiet quasars
Authors: Goyal, Arti
Sagar, R
Anupama, G. C
Sahu, D. K
Keywords: Galaxies: Active;Galaxies: Nuclei;Galaxies: Jets;Quasars: General;Bl Lacertae Objects: General
Issue Date: Jun-2007
Publisher: Astronomical Society of India
Citation: Bulletin of the Astronomical Society of India, Vol. 35, No. 2, pp. 141 - 154
Abstract: Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily since only a handful of INOV events with good statistical significance, albeit small amplitude, have been reported so far. This has motivated us to continue intra-night optical monitoring of bona-fide radio-quiet quasars (RQQs). Here we present the results for a sample of 11 RQQs monitored by us on 19 nights. On 5 of these nights a given RQQ was monitored simultaneously from two well separated observatories. In all, two clear cases and two probable cases of INOV events were detected. From these data, we estimate an INOV duty cycle of sim8% for RQQs which would increase to 19% if the `probable variable' cases are also included. Such comparatively small INOV duty cycles for RQQs, together with the small INOV amplitudes (sim1%), are in accord with the previously deduced characteristics of this phenomenon.
ISSN: 0304-9523
???metadata.dc.rights???: © Astronomical Society of India
Appears in Collections:Publications based on data from IAO, Hanle
BASI Publications
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