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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Radio to gamma-ray variability study of blazar S5 0716+714
Astronomy and Astrophysics, Volume 552, Article A11, Year 2013
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Description
We present the results of a series of radio, optical, X-ray, and γ-ray observations of the BL Lac object S50716+714 carried out between April 2007 and January 2011. The multifrequency observations were obtained using several ground- and space-based facilities. The intense optical monitoring of the source reveals faster repetitive variations superimposed on a long-term variability trend on a time scale of ∼350 days. Episodes of fast variability recur on time scales of ∼60?70 days. The intense and simultaneous activity at optical and γ-ray frequencies favors the synchrotron self-Compton mechanism for the production of the high-energy emission. Two major low-peaking radio flares were observed during this high optical/γ-ray activity period. The radio flares are characterized by a rising and a decaying stage and agrees with the formation of a shock and its evolution. We found that the evolution of the radio flares requires a geometrical variation in addition to intrinsic variations of the source. Different estimates yield robust and self-consistent lower limits of λ ≥ 20 and equipartition magnetic field Beq ≥ 0.36 G. Causality arguments constrain the size of emission region θ ≤ 0.004 mas. We found a significant correlation between flux variations at radio frequencies with those at optical and γ-rays. The optical/GeV flux variations lead the radio variability by ∼65 days. The longer time delays between low-peaking radio outbursts and optical flares imply that optical flares are the precursors of radio ones. An orphan X-ray flare challenges the simple, one-zone emission models, rendering them too simple. Here we also describe the spectral energy distribution modeling of the source from simultaneous data taken through different activity periods. © 2013 ESO.
Authors & Co-Authors
Rani, Bindu
Germany, Bonn
Max Planck Institute for Radio Astronomy
Krichbaum, Thomas P.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Fuhrmann, Lars
Germany, Bonn
Max Planck Institute for Radio Astronomy
Boettcher, M.
United States, Athens
Ohio University
South Africa, Potchefstroom
North-west University
Lott, Benoît
France, Bordeaux
Université de Bordeaux
Aller, Hugh D.
United States, Ann Arbor
University of Michigan, Ann Arbor
Aller, M. F.
United States, Ann Arbor
University of Michigan, Ann Arbor
Angelakis, Emmanouil
Germany, Bonn
Max Planck Institute for Radio Astronomy
Bach, Uwe
Germany, Bonn
Max Planck Institute for Radio Astronomy
Bastieri, D.
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Italy, Padua
Università Degli Studi Di Padova
Falcone, Abraham D.
United States, University Park
Pennsylvania State University
Fukazawa, Yasushi
Japan, Higashihiroshima
Hiroshima University
Gabányi, Krisztiná Éva
Hungary, Budapest
Budapest Főváros Kormányhivatala, Földmérési, Távérzékelési és Földhivatali Főosztály Bfkh Ftff
Hungary, Budapest
Magyar Tudomanyos Akademia
Gupta, Alok Chandra
India, Nainital
Aryabhatta Research Institute of Observational Sciences
Gurwell, Mark A.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Itoh, Ryosuke
Japan, Higashihiroshima
Hiroshima University
Kawabata, Koji S.
Japan, Higashihiroshima
Hiroshima University
Krips, Melanie
France, Saint Martin D'heres
Iram Institut de Radioastronomie Millimétrique
L¨ahteenm¨aki, Anne A.
Finland, Espoo
Aalto University
Liu, Xiang
China, Urumqi
Xinjiang Astronomical Observatory
Marchili, Nicola
Germany, Bonn
Max Planck Institute for Radio Astronomy
Italy, Padua
Università Degli Studi Di Padova
Max-Moerbeck, Walter
United States, Pasadena
California Institute of Technology
Nestoras, Ioannis
Germany, Bonn
Max Planck Institute for Radio Astronomy
Nieppola, Elina
Finland, Espoo
Aalto University
Quintana-Lacaci, Guillermo
Spain, Granada
Instituto de Radioastronomia Milimetrica
Spain, Torrejon de Ardoz
Centro de Astrobiología Csic-inta
Readhead, Anthony C.S.
United States, Pasadena
California Institute of Technology
Richards, Joseph L.
United States, West Lafayette
Purdue University
Sasada, Mahito
Japan, Higashihiroshima
Hiroshima University
Japan, Kyoto
Kyoto University
Sievers, Albrecht W.
Spain, Granada
Instituto de Radioastronomia Milimetrica
Sokolovsky, Kirill V.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Russian Federation, Moscow
P.n. Lebedev Physical Institute of the Russian Academy of Sciences
Stroh, Michael Cullen
United States, University Park
Pennsylvania State University
Tammi, Joni
Finland, Espoo
Aalto University
Tornikoski, Merja
Finland, Espoo
Aalto University
Uemura, Makoto
Japan, Higashihiroshima
Hiroshima University
Ungerechts, Hans
Spain, Granada
Instituto de Radioastronomia Milimetrica
Urano, Takeshi
Japan, Higashihiroshima
Hiroshima University
Zensus, Anton J.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Statistics
Citations: 89
Authors: 37
Affiliations: 22
Identifiers
Doi:
10.1051/0004-6361/201321058
ISSN:
00046361
e-ISSN:
14320746
Research Areas
Environmental