학술논문
Multi-frequency monitoring of gamma-ray loud blazars: I. Light curves and spectral energy distributions
Document Type
Working Paper
Author
Bach, U.; Raiteri, C. M.; Villata, M.; Fuhrmann, L.; Buemi, C. S.; Larionov, V. M.; Leto, P.; Arkharov, A. A.; Coloma, J. M.; Di Paola, A.; Dolci, M.; Efimova, N.; Forne, E.; Ibrahimov, M. A.; Hagen-Thorn, V.; Konstantinova, T.; Kopatskaya, E.; Lanteri, L.; Kurtanidze, O. M.; Maccaferri, G.; Nikolashvili, M. G.; Orlati, A.; Ros, J. A.; Tosti, G.; Trigilio, C.; Umana, G.
Source
Subject
Language
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.
Comment: 16 pages, 3 large figures, accepted for publication in A&A
Comment: 16 pages, 3 large figures, accepted for publication in A&A