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Quasi-Periodicities at Year Time Scales in Blazars

Published online by Cambridge University Press:  23 June 2017

Stefano Covino Open the ORCID record for Stefano Covino [Opens in a new window] ,
Angela Sandrinelli  and
Aldo Treves
Stefano Covino
Affiliation:
INAF/Brera Astronomical Observatory, via Bianchi 46, 23897, Merate (LC), Italy
Angela Sandrinelli
Affiliation:
INAF/Brera Astronomical Observatory, via Bianchi 46, 23897, Merate (LC), Italy Università degli Studi dell’Insubria, Via Valleggio 11, 22100 Como, Italy
Aldo Treves
Affiliation:
Università degli Studi dell’Insubria, Via Valleggio 11, 22100 Como, Italy
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Abstract

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We examine the 2008-2016 gamma-ray and optical light curves of a number of bright Fermi blazars. In a fraction of them, the periodograms show possible evidence of quasi-periodicities related in the two bands. This coincidence strengthens their physical meaning. Comparing with results from the periodicity search of quasars, the presence of quasi-periodicities in blazars suggests that the basic condition for its observability is related to the relativistic jet in the observer direction, but the overall picture remains uncertain.

Keywords

BL Lacertae objects: generalmethods: statistical

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