Radio-optical flux behavior and spectral energy distribution of the intermediate blazar GC 0109+224

Details Radio-optical flux behavior and spectral energy distribution of the intermediate blazar GC 0109+224 Radio-optical flux behavior and spectral energy distribution of the intermediate blazar GC 0109+224

2004-01-14

arxiv.org/abs/astro-ph/0401271v2

Mon.Not.Roy.Astron.Soc. 348 (2004) 1379

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures, 2 tables. Typeset with a LaTex2e-AMSLaTex code prepared by the author (using mn2e class, and natbib, hyper

Scientific paper

10.1111/j.1365-2966.2004.07467.x

About twenty years of radio observations in five bands (from 4.8 to 37 GHz) of the BL Lac object GC 0109+224 (S2 0109+22, RGB J0112+227), are presented and analysed together with the optical data. Over the past ten years this blazar has exhibited enhanced activity. There is only weak correlation between radio and optical flares delays, usually protracted on longer timescales in the radio with respect to the optical. In some cases no radio flare counterpart was observed for the optical outbursts. The radio variability, characterised by peaks superposition, shows hints of some characteristic timescales (around the 3-4 years), and a fluctuation mode between the flickering and the shot noise. The reconstructed spectral energy distribution, poorly monitored at high energies, is preliminarily parameterised with a synchrotron-self Compton description. The smooth synchrotron continuum, peaked in the near-IR-optical bands, strengthens the hypothesis that this source could be an intermediate blazar. Moreover the intense flux in millimetre bands, and the optical and X-ray brightness, might suggest a possible detectable gamma-ray emission.

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