Long-term multiwavelength studies of high-redshift blazar 0836+710
Abstract
Aims: The observation of γ-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 γ-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 γ-ray flaring emission. In contrast, there is no clear correlation between radio and γ-ray activity, indicating radio emission regions that are unrelated to the parts of the jet that produce the γ rays. The γ-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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 2013
- DOI:
- 10.1051/0004-6361/201321721
- arXiv:
- arXiv:1307.0529
- Bibcode:
- 2013A&A...556A..71A
- Keywords:
-
- galaxies: active;
- gamma rays: galaxies;
- quasars: individual: 0836+710;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 11 pages, 10 figures, Accepted for publication in A&