Multiwavelength behaviour of the blazar OJ 248 from radio to γ -rays

M. I. Carnerero, C. M. Raiteri, M. Villata, J. A. Acosta-Pulido, F. D'Ammando, P. S. Smith, V. M. Larionov, I. Agudo, M. J. Arévalo, A. A. Arkharov, U. Bach, R. Bachev, E. Benítez, D. A. Blinov, V. Bozhilov, C. S. Buemi, A. Bueno Bueno, D. Carosati, C. Casadio, W. P. ChenG. Damljanovic, A. Di Paola, N. V. Efimova, Sh A. Ehgamberdiev, M. Giroletti, J. L. Gómez, P. A. González-Morales, A. B. Grinon-Marin, T. S. Grishina, M. A. Gurwell, D. Hiriart, H. Y. Hsiao, S. Ibryamov, S. G. Jorstad, M. Joshi, E. N. Kopatskaya, O. M. Kurtanidze, S. O. Kurtanidze, A. Lähteenmäki, E. G. Larionova, L. V. Larionova, C. Lázaro, P. Leto, C. S. Lin, H. C. Lin, A. I. Manilla-Robles, A. P. Marscher, I. M. McHardy, Y. Metodieva, D. O. Mirzaqulov, A. A. Mokrushina, S. N. Molina, D. A. Morozova, M. G. Nikolashvili, M. Orienti, E. Ovcharov, N. Panwar, A. Pastor Yabar, I. Puerto Giménez, V. Ramakrishnan, G. M. Richter, M. Rossini, L. A. Sigua, A. Strigachev, B. Taylor, M. Tornikoski, C. Trigilio, Yu V. Troitskaya, I. S. Troitsky, G. Umana, A. Valcheva, S. Velasco, O. Vince, A. E. Wehrle, H. Wiesemeyer

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26 Scopus citations

Abstract

We present an analysis of the multiwavelength behaviour of the blazar OJ 248 at z = 0.939 in the period 2006-2013. We use low-energy data (optical, near-infrared, and radio) obtained by 21 observatories participating in the Gamma-Ray Large Area Space Telescope (GLAST)-AGILE Support Program of the Whole Earth Blazar Telescope, as well as data from the Swift (optical-UV and X-rays) and Fermi (γ -rays) satellites, to study flux and spectral variability and correlations among emissions in different bands. We take into account the effect of absorption by the Damped Lyman α intervening system at z = 0.525. Two major outbursts were observed in 2006-2007 and in 2012-2013 at optical and near-IR wavelengths, while in the high-frequency radio light curves prominent radio outbursts are visible peaking at the end of 2010 and beginning of 2013, revealing a complex radio-optical correlation. Crosscorrelation analysis suggests a delay of the optical variations after the γ -ray ones of about a month, which is a peculiar behaviour in blazars. We also analyse optical polarimetric and spectroscopic data. The average polarization percentage P is less than 3 per cent, but it reaches~19 per cent during the early stage of the 2012-2013 outburst.Avague correlation of P with brightness is observed. There is no preferred electric vector polarization angle and during the outburst the linear polarization vector shows wide rotations in both directions, suggesting a complex behaviour/structure of the jet and possible turbulence. The analysis of 140 optical spectra acquired at the Steward Observatory reveals a strong Mg II broad emission line with an essentially stable flux of 6.2 × 10-15 erg cm-2 s-1 and a full width at half-maximum of 2053 km s-1.

Original languageEnglish (US)
Pages (from-to)2677-2691
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume450
Issue number3
DOIs
StatePublished - Jul 1 2015
Externally publishedYes

Keywords

  • Galaxies: active
  • Galaxies: jets
  • Quasars: general
  • Quasars: individual: OJ 248

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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