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    Quasi-periodic behaviour in the optical and γ-ray light curves of blazars 3C 66A and B2 1633+38

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    Author
    Otero-Santos, J
    Acosta-Pulido, J A
    Becerra González, J
    Raiteri, C M
    Larionov, V M
    Peñil, P
    Smith, P S
    Ballester Niebla, C
    Borman, G A
    Carnerero, M I
    Castro Segura, N
    Grishina, T S
    Kopatskaya, E N
    Larionova, E G
    Morozova, D A
    Nikiforova, A A
    Savchenko, S S
    Troitskaya, Yu V
    Troitsky, I S
    Vasilyev, A A
    Villata, M
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2020-01-16
    Keywords
    galaxies: active
    BL Lacertae objects: general
    BL Lacertae objects: individual (3C 66A, B2 1633+38)
    galaxies: nuclei
    
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    Publisher
    OXFORD UNIV PRESS
    Citation
    J Otero-Santos, J A Acosta-Pulido, J Becerra González, C M Raiteri, V M Larionov, P Peñil, P S Smith, C Ballester Niebla, G A Borman, M I Carnerero, N Castro Segura, T S Grishina, E N Kopatskaya, E G Larionova, D A Morozova, A A Nikiforova, S S Savchenko, Yu V Troitskaya, I S Troitsky, A A Vasilyev, M Villata, Quasi-periodic behaviour in the optical and γ-ray light curves of blazars 3C 66A and B2 1633+38, Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 4, March 2020, Pages 5524–5539, https://doi.org/10.1093/mnras/staa134
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    Copyright © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We report on quasi-periodic variability found in two blazars included in the Steward Observatory Blazar Monitoring data sample: the RI_ Lac object 3C 66A and the Flat Spectrum Radio Quasar 132 1633+38. We collect optical photometric mid polarimetric data in V and R bands of these sources from different observatories: St, Petersburg University, Crimean Astrophysical Observatory, WEBT GASP, Catalina Real-Time Transient Survey, Steward Observatory, STELLA Robotic Observatory, and Katzman Automatic Imaging Telescope. In addition, an analysis of the y-ray light curves from Fermi LAI' is included, Three methods are used to search for any periodic behaviour in the data: the Z-trans form Discrete Correlation Function, the Lomb Scargle periodogram and the Weighted Wavelet Z-transform. We find pieces of evidence of possible quasi-periodic variability in the optical photometric data of both sources with periods of 3 yr for 3C 66A and 1.9 yr for B2 1633+38, with significances between 3o- and 50-. Only B2 1633+38 shows evidence of this behaviour in the optical polarized data set at a confidence level of 20-,10-. This is the first reported evidence of quasi periodic behaviour in the optical light curve of B2 1633+38. Also, a hint of quasi-periodic behaviour is found in the y-ray light curve of B2 1633+38 with a confidence level >20-, while no periodicity is observed for 3C 66A in this energy range. We propose different jet emission models that could explain the quasi-periodic variability and the differences found between these two sources.
    ISSN
    0035-8711
    DOI
    10.1093/mnras/staa134
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/staa134
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