Details

Autor(en) / Beteiligte

• Villata, M.
• Raiteri, C. M.
• Larionov, V. M.
• Kurtanidze, O. M.
• Nilsson, K.
• Aller, M. F.
• Tornikoski, M.
• Volvach, A.
• Aller, H. D.
• Arkharov, A. A.
• Bach, U.
• Beltrame, P.
• Bhatta, G.
• Buemi, C. S.
• Böttcher, M.
• Calcidese, P.
• Carosati, D.
• Castro-Tirado, A. J.
• Da Rio, D.
• Di Paola, A.
• Dolci, M.
• Forné, E.
• Frasca, A.
• Hagen-Thorn, V. A.
• Heidt, J.
• Hiriart, D.
• Jelínek, M.
• Kimeridze, G. N.
• Konstantinova, T. S.
• Kopatskaya, E. N.
• Lanteri, L.
• Leto, P.
• Ligustri, R.
• Lindfors, E.
• Lähteenmäki, A.
• Marilli, E.
• Nieppola, E.
• Nikolashvili, M. G.
• Pasanen, M.
• Ragozzine, B.
• Ros, J. A.
• Sigua, L. A.
• Smart, R. L.
• Sorcia, M.
• Takalo, L. O.
• Tavani, M.
• Trigilio, C.
• Turchetti, R.
• Uckert, K.
• Umana, G.
• Vercellone, S.
• Webb, J. R.

Titel

Multifrequency monitoring of the blazar 0716+714 during the GASP-WEBT-AGILE campaign of 2007

Ist Teil von

• Astronomy and astrophysics (Berlin), 2008-04, Vol.481 (2), p.L79-L82

Ort / Verlag

EDP Sciences

Erscheinungsjahr

2008

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Aims. Since the CGRO operation in 1991–2000, one of the primary unresolved questions about the blazar γ-ray emission has been its possible correlation with the low-energy (in particular optical) emission. To help answer this problem, the Whole Earth Blazar Telescope (WEBT) consortium has organized the GLAST-AGILE Support Program (GASP) to provide the optical-to-radio monitoring data to be compared with the γ-ray detections by the AGILE and GLAST satellites. This new WEBT project started in early September 2007, just before a strong γ-ray detection of 0716+714 by AGILE. Methods. We present the GASP-WEBT optical and radio light curves of this blazar obtained in July–November 2007, about various AGILE pointings at the source. We construct NIR-to-UV spectral energy distributions (SEDs), by assembling GASP-WEBT data together with UV data from the Swift ToO observations of late October. Results. We observe a contemporaneous optical-radio outburst, which is a rare and interesting phenomenon in blazars. The shape of the SEDs during the outburst appears peculiarly wavy because of an optical excess and a UV drop-and-rise. The optical light curve is well sampled during the AGILE pointings, showing prominent and sharp flares. A future cross-correlation analysis of the optical and AGILE data will shed light on the expected relationship between these flares and the γ-ray events.