Multi-frequency monitoring of γ-ray loud blazars I. Light curves and spectral energy distributions

Journal
Date Issued
2007
Author(s)
Bach, U.
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Fuhrmann, L.
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Larionov, V.M.
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Arkharov, G.A.A.
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Coloma, J.M.
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Efimova, N.
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Forné, E.
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Ibrahimov, M.A.
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Hagen-Thorn, V.
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Konstantinova, T.
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Kopatskaya, E.
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Kurtanidze, O.M.
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Nikolashvili, M.G.
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Ros, J.A.
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Tosti, G.
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DOI
Abstract
Context: Being dominated by non-thermal emission from aligned relativistic jets, blazars allow us to elucidate the physics of extragalactic jets, and, ltimately, how the energy is extracted from the central black hole in radio-loud active galactic nuclei. Aims: Crucial information is provided by broad-band spectral energy distributions (SEDs), their trends with luminosity and correlated multi-frequency variability. With this study we plan to obtain a database of contemporaneous radio-to-optical spectra of a sample of blazars, which are and will be observed by current and future high-energy satellites. Methods: Since December 2004 we are performing a monthly multi-frequency radio monitoring of a sample of 35 blazars at the antennas in Medicina and Noto. Contemporaneous near-IR and optical observations for all our observing epochs are organised. Results: Until June 2006 about 4000 radio measurements and 5500 near-IR and optical measurements were obtained. Most of the sources show significant variability in all observing bands. Here we present the multi-frequency data acquired during the first eighteen months of the project, and construct the SEDs for the best-sampled sources.
Volume
464
Issue
1
Start page
175
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2007A&A...464..175B
Rights
open.access
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