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http://hdl.handle.net/20.500.12386/24750
Titolo: | Gamma-Ray and Optical Oscillations in PKS 0537-441 | Autori: | Sandrinelli, A. COVINO, Stefano Treves, A. |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 820 | Fascicolo: | 1 | Da pagina:: | 20 | 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. | URI: | http://hdl.handle.net/20.500.12386/24750 | URL: | https://iopscience.iop.org/article/10.3847/0004-637X/820/1/20 | ISSN: | 0004-637X | DOI: | 10.3847/0004-637X/820/1/20 | Bibcode ADS: | 2016ApJ...820...20S | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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