The nature of the intra-night optical variability in blazars

Abstract

In this paper we present results of a short-term optical monitoring of 13 blazars. The objects were monitored mostly in the R-band for a total of ~ 160 hours between 2006 and 2011. We study the nature of the short-term variations and show that most of them could be described as slow, smooth, and (almost) linear changes of up to ~ 0.1 mag/hour, but many objects show no short-term variations at all. In fact, we found only ~ 2 per cent chance to observe variability of more than 0.1 mag/hour for the sample we observed. Hints for quasi-periodic oscillations at very low amplitude levels are also found for some objects. We briefly discuss some of the possible mechanisms to generate the intra-night variability and the quasi-periodic oscillations.

10 pages, 13 figures, 1 table, Accepted for Publication in MNRAS

References in corpus (11)

• Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies
• Multi-colour optical monitoring of eight red blazars
• Periodic Oscillations in the Intra-day Optical Light Curves of the Blazar S5 0716+714
• Optical Intra-day Variability in Blazars
• The Outburst of the Blazar AO 0235+164 in 2006 December: Shock-in-Jet Interpretation
• The WEBT Campaign on the Blazar 3C279 in 2006
• Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006--2007 outburst
• The high activity of 3C 454.3 in autumn 2007. Monitoring by the WEBT during the AGILE detection
• Extremely violent optical microvariability in blazars: fact or fiction?
• The Multiple Timescales of Optical Variability of the Blazar 3C 279 During the 2001-2002 Outburst
• Photometric monitoring of the blazar 3C 345 for the period 1996 - 2006

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