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http://hdl.handle.net/20.500.12386/26884
Title: | Gamma-ray and optical oscillations of 0716+714, MRK 421, and BL Lacertae | Authors: | Sandrinelli, A. COVINO, Stefano Treves, A. Lindfors, E. RAITERI, Claudia Maria Nilsson, K. Takalo, L. O. Reinthal, R. Berdyugin, A. Fallah Ramazani, V. Kadenius, V. Tuominen, T. Kehusmaa, P. Bachev, R. Strigachev, A. |
Issue Date: | 2017 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 600 | First Page: | A132 | Abstract: | We examine the 2008-2016 γ-ray and optical light curves of three bright BL Lac objects, 0716+714, MRK 421, BL Lac, which exhibit large structured variability. We searched for periodicities by using a fully Bayesian approach. For two out of three sources investigated, no significant periodic variability was found. In the case of BL Lac, we detected a periodicity of 680 days. Although the signal related to this is modest, the coincidence of the periods in both gamma and optical bands is indicative of a physical relevance. Taking into consideration previous literature results, possibly related γ-ray and optical periodicities of about one year time scale are proposed in four bright γ-ray blazars out of the ten examined in detail. Compared with results from periodicity search of optical archives of quasars, the presence of quasi-periodicities in blazars may be more frequent by a large factor. This suggests the intriguing possibility that the basic conditions for their observability are related to the relativistic jet in the observer direction, but the overall picture remains uncertain. | URI: | http://hdl.handle.net/20.500.12386/26884 | URL: | https://www.aanda.org/articles/aa/abs/2017/04/aa30288-16/aa30288-16.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201630288 | Bibcode ADS: | 2017A&A...600A.132S | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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