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Gamma-Ray and Optical Oscillations in PKS 0537-441

Journal
Date Issued
2016
Author(s)
Sandrinelli, A.
•
•
Treves, A.
DOI
Abstract
We have considered the Fermi γ-ray light curve of the blazar PKS 0537-441 during a high state extending from 2008 August 10 to 2011 August 27. The periodogram exhibits a peak at T ∼ 280 days, with a significance of ∼99.7%. A peak of similar relevance at \frac{1}{2}T is found in the optical light curves. Considering the entire duration of the Fermi light curve 2008-2015, no significant peak is revealed, while the optical one remains meaningful. Comparing with recent observations of PKS 2155-304 and PG 1553+113 it seems that month-year oscillations can characterize some blazars. Month-scale oscillations can also show up only during phases of enhanced or bursting emission, such as in the case of PKS 0537-441.
Volume
820
Issue
1
Start page
20
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2016ApJ...820...20S
Rights
open.access
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