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Long-term multiwavelength studies of high-redshift blazar 0836+710

A. AkyüzNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAD. J. ThompsonNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAD. DonatoCRESST, Department of Astronomy, University of Maryland, College Park, MD 20742, USAJ. S. PerkinsCRESST, CSST, University of Maryland, Baltimore County, Baltimore, MD 21250, USAL. FuhrmannMax-Planck-Institut fr Radioastronomie, Auf dem Hgel 69, 53121 Bonn, GermanyE. AngelakisMax-Planck-Institut fr Radioastronomie, Auf dem Hgel 69, 53121 Bonn, GermanyJ. A. ZensusMax-Planck-Institut fr Radioastronomie, Auf dem Hgel 69, 53121 Bonn, GermanyS. LarssonThe Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, 106 91 Stockholm, SwedenK. V. SokolovskyAstro Space Center of Lebedev Physical Institute, Profsoyuznaya Str. 84/32, 117997 Moscow, RussiaO. M. KurtanidzeLandessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, 69117 Heidelberg, Germany

2013en

ABI

Annotatsiya

Aims. The observation of -ray flares from blazar 0836+710 in 2011, following a period of quiescence, offered an opportunity to study correlated activity at different wavelengths for a high-redshift (z = 2.218) active galactic nucleus. Methods. Optical and radio monitoring, plus Fermi-LAT -ray monitoring provided 2008-2012 coverage, while Swift offered auxiliary optical, ultraviolet, and X-ray information. Other contemporaneous observations were used to construct a broad-band spectral energy distribution. Results. There is evidence of correlation but not a measurable lag between the optical and -ray flaring emission. In contrast, there is no clear correlation between radio and -ray activity, indicating radio emission regions that are unrelated to the parts of the jet that produce the rays. The -ray energy spectrum is unusual in showing a change of shape from a power law to a curved spectrum when going from the quiescent state to the active state.

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DOI: 10.1051/0004-6361/201321721

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