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Author Rani, B. ♦ Gupta, A. C. ♦ Joshi, U. C. ♦ Ganesh, S. ♦ Wiita, P. J.
Source Aryabhatta Research Institute of Observational Sciences (ARIES)
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Galaxies- active ♦ BL Lacertae objects-general ♦ Galaxies-photometry.
Abstract We have carried out optical (R band) intraday variability (IDV) monitoring of a sample of10 bright low energy peaked blazars (LBLs). 40 photometric observations, of an averageof ∼4 h each, were made between 2008 September and 2009 June using two telescopesin India. Measurements with good signal-to-noise ratios were typically obtained within 1–3min, allowing the detection of weak, fast variations using N-star differential photometry.We employed both structure function and discrete correlation function analysis methods toestimate any dominant time-scales of variability and found that in most of the cases any suchtime-scales were longer than the duration of the observation. The calculated duty cycle ofIDV in LBLs during our observing run is ∼52 per cent, which is low compared to manyearlier studies; however, the relatively short periods for which each source was observed canprobably explain this difference. We briefly discuss possible emission mechanisms for theobserved variability.
Part of series mn413-2157
Educational Use Research
Education Level UG and PG
Learning Resource Type Article