Quasi-periodicities at Year-like Timescales in Blazars

Journal
Date Issued
2016
Author(s)
Sandrinelli, A.
•
•
Dotti, M.
•
Treves, A.
DOI
Abstract
We searched for quasi-periodicities on year-like timescales in the light curves of six blazars in the optical—near-infrared bands and we made a comparison with the high energy emission. We obtained optical/NIR light curves from Rapid Eye Mounting photometry plus archival Small & Moderate Aperture Research Telescope System data and we accessed the Fermi light curves for the γ-ray data. The periodograms often show strong peaks in the optical and γ-ray bands, which in some cases may be inter-related. The significance of the revealed peaks is then discussed, taking into account that the noise is frequency dependent. Quasi-periodicities on a year-like timescale appear to occur often in blazars. No straightforward model describing these possible periodicities is yet available, but some plausible interpretations for the physical mechanisms causing periodic variabilities of these sources are examined.
Volume
151
Issue
3
Start page
54
Uri
Url
Issn Identifier
0004-6256
Ads BibCode
2016AJ....151...54S
Rights
open.access
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