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Long-term multiwavelength studies of high-redshift blazar 0836+710
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2013 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 556Article in journal (Refereed) Published
Abstract [en]

Aims. The observation of gamma-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 gamma-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 gamma-ray activity, indicating radio emission regions that are unrelated to the parts of the jet that produce the gamma rays. The gamma-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.

Place, publisher, year, edition, pages
2013. Vol. 556
Keyword [en]
galaxies: active, gamma rays: galaxies, quasars: individual: 0836+710
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-94585ISI: 000323893500071OAI: diva2:654807


Available from: 2013-10-08 Created: 2013-10-07 Last updated: 2013-10-08Bibliographically approved

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Larsson, Stefan
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Department of AstronomyDepartment of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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