Thursday, July 4, 2013

1307.0529 (A. Akyuz et al.)

Long-Term Multiwavelength Studies of High-Redshift Blazar 0836+710    [PDF]

A. Akyuz, D. J. Thompson, D. Donato, J. S. Perkins, L. Fuhrmann, E. Angelakis, J. A. Zensus, S. Larsson, K. Sokolovsky, O. Kurtanidze
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 gamma-ray flaring emission. On the contrary, 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.
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