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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The first fermi multifrequency campaign on BL Lacertae: Characterizing the low-activity state of the eponymous blazar
Astrophysical Journal, Volume 730, No. 2, Article 101, Year 2011
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Description
We report on observations of BLLacertae during the first 18 months of Fermi LAT science operations and present results from a 48 day multifrequency coordinated campaign from 2008 August 19 to 2008 October 7. The radio to gamma-ray behavior of BLLac is unveiled during a low-activity state thanks to the coordinated observations of radio-band (Metsähovi and VLBA), near-IR/optical (Tuorla, Steward, OAGH, and MDM), and X-ray (RXTE and Swift) observatories. No variability was resolved in gamma rays during the campaign, and the brightness level was 15 times lower than the level of the 1997 EGRET outburst. Moderate and uncorrelated variability has been detected in UV and X-rays. The X-ray spectrum is found to be concave, indicating the transition region between the low- and high-energy components of the spectral energy distribution (SED). VLBA observation detected a synchrotron spectrum self-absorption turnover in the innermost part of the radio jet appearing to be elongated and inhomogeneous, and constrained the average magnetic field there to be less than 3 G. Over the following months, BLLac appeared variable in gamma rays, showing flares (in 2009 April and 2010 January). There is no evidence for the correlation of gamma rays with the optical flux monitored from the ground in 18 months. The SED may be described by a single-zone or a two-zone synchrotron self-Compton (SSC) model, but a hybrid SSC plus external radiation Compton model seems to be preferred based on the observed variability and the fact that it provides a fit closest to equipartition. © 2011. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Abdo, Aous A.
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Washington, D.c.
National Academy of Sciences
Ackermann, Markus
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Ajello, Marco
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Antolini, Elisa
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Baldini, Luca
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Ballet, Jean
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Barbiellini, Guido
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Università Degli Studi Di Trieste
Bastieri, D.
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Italy, Padua
Università Degli Studi Di Padova
Bechtol, Keith C.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Bellazzini, Ronaldo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Berenji, B.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Blandford, Rogerd D.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Bonamente, Emanuele
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Borgland, Anders W.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Bregeon, Johan
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Brigida, Monica
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Bruel, Philippe V.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Buehler, Rolf
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Buson, Sara
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Italy, Padua
Università Degli Studi Di Padova
Caliandro, Giuseppe Andrea
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Cameron, Robert A.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Cannon, Anna
United States, Greenbelt
Nasa Goddard Space Flight Center
Ireland, Dublin
University College Dublin
Caraveo, Patrizia A.
Italy, Milan
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Milan
Carrigan, Svenja
Italy, Padua
Università Degli Studi Di Padova
Casandjian, Jean Marc
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Cecchi, Claudia
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Charles, Eric
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Chekhtman, Alexandre
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Fairfax
George Mason University
Cheung, Chi C.Teddy
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Washington, D.c.
National Academy of Sciences
Chiang, James
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Ciprini, Stefano
Italy, Perugia
Università Degli Studi Di Perugia
Claus, Richard
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Cohen-Tanugi, Johann
France, Montpellier
Université de Montpellier
Conrad, Jan
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Oskar Klein Centre
Costamante, Luigi
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Cutini, S.
Italy, Rome
Agenzia Spaziale Italiana
Dermer, Charles Dennison
United States, Washington, D.c.
U.s. Naval Research Laboratory
de Palma, Francesco
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Donato, Davide
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
do Couto E Silva, Eduardo
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Drell, Persis S.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Dubois, Richard
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Favuzzi, Cecilia
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Fegan, Stephen J.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Finke, Justin D.
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Washington, D.c.
National Academy of Sciences
Focke, Warren B.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Fortin, Pascal
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Frailis, Marco
Italy, Udine
Università Degli Studi Di Udine
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Fukazawa, Yasushi
Japan, Higashihiroshima
Hiroshima University
Funk, Stefan
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Fusco, Piergiorgio G.
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Gargano, Fabio
Italy, Rome
Agenzia Spaziale Italiana
Gasparrini, Dario
United States, Greenbelt
Nasa Goddard Space Flight Center
Gehrels, Neil C.
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Germani, Stefano
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Giglietto, Nicola
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Giordano, Francesco
Italy, Bologna
Istituto Di Radioastronomia, Bologna
Giroletti, Marcello
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Glanzman, Thomas
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Godfrey, Gary L.
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Grenier, Isabelle A.
United States, Huntsville
The University of Alabama in Huntsville
Guiriec, Sylvain
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Hadasch, Daniela
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Hayashida, Masaaki
United States, Greenbelt
Nasa Goddard Space Flight Center
Hays, Elizabeth A.
United States, Columbus
The Ohio State University
Hughes, Richard E.
Japan, Higashihiroshima
Hiroshima University
Itoh, Ryosuke
Iceland, Reykjavik
Haskoli Islands
Jóhannesson, Gudlaugur
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Johnson, Anthony S.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Johnson, William Neil
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Kamae, Tsuneyoshi
Japan, Higashihiroshima
Hiroshima University
Katagiri, Hideaki
Japan, Tokyo
Waseda University
Kataoka, Jun
France, Toulouse
Université Toulouse Iii - Paul Sabatier
Kn̈odlseder, Jürgen
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Kuss, Michael W.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Lande, Joshua
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Oskar Klein Centre
Larsson, Stefan
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Latronico, Luca
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Llena-Garde, Maja
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Università Degli Studi Di Trieste
Longo, Francesco
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Loparco, Francesco
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Lott, Benoît
United States, Washington, D.c.
U.s. Naval Research Laboratory
Lovellette, Michael N.
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Lubrano, Pasquale
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Fairfax
George Mason University
Mazziotta, Mario Nicola
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
McEnery, Julie E.
France, Montpellier
Université de Montpellier
Méhault, Jérémie
France, Montpellier
Université de Montpellier
Michelson, Peter F.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Mizuno, Tsunefumi
Japan, Higashihiroshima
Hiroshima University
Monzani, Maria Elena
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Morselli, Aldo
Italy, Rome
Università Degli Studi Di Roma Tor Vergata
Moskalenko, Igor V.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Murgia, Simona
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Nakamori, Takeshi
Japan, Tokyo
Waseda University
Naumann-Godó, Melitta
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Nolan, Patrick L.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Nuss, Eric
France, Montpellier
Université de Montpellier
Ohsugi, Takashi
Japan, Higashihiroshima
Hiroshima University
Omodei, Nicola
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Orlando, E.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Ormes, Jonathan F.
United States, Denver
University of Denver
Paneque, David
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Parent, Damien
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Fairfax
George Mason University
Pelassa, Vèronique
France, Montpellier
Université de Montpellier
Pesce-Rollins, Melissa
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Piron, Frédéric
France, Montpellier
Université de Montpellier
Porter, Troy A.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Rainó, Silvia
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Rando, Riccardo
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Italy, Padua
Università Degli Studi Di Padova
Razzano, Massimiliano
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Reimer, Anita
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Austria, Innsbruck
Universität Innsbruck
Reimer, Olaf
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Austria, Innsbruck
Universität Innsbruck
Ritz, Steven
United States, Santa Cruz
University of California, Santa Cruz
Sadrozinski, Hartmut F.W.
United States, Santa Cruz
University of California, Santa Cruz
Sánchez, David A.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Schinzel, Frank K.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Sgro', Carmelo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Siskind, Eric J.
United States, Rocky Point
Nycb Realtime Computing Inc.
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
Spandre, G.
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Spinelli, Paolo
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Strickman, Mark S.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Suson, Daniel J.
United States, Westville
Purdue University Northwest
Takahashi, Hiromitsu
Japan, Higashihiroshima
Hiroshima University
Thayer, Jana B.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Thompson, David J.
United States, Greenbelt
Nasa Goddard Space Flight Center
Tibaldo, Luigi
United States, Washington, D.c.
U.s. Naval Research Laboratory
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Italy, Padua
Università Degli Studi Di Padova
Torres, Diego F.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Spain, Barcelona
Institució Catalana de Recerca I Estudis Avançats
Tosti, Gino
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Tramacere, Andrea
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Switzerland, Geneva
Université de Genève
Usher, Tracy L.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Vandenbroucke, Justin A.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Vilchez, Nicolas P.E.
France, Toulouse
Université Toulouse Iii - Paul Sabatier
Vitale, V.
Italy, Rome
Università Degli Studi Di Roma Tor Vergata
Waite, A. P.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Wood, Kent S.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Berdyugin, Andrei V.
Finland, Turku
Turun Yliopisto
Boettcher, M.
United States, Athens
Ohio University
De La Fuente, Eduardo
Mexico, Guadalajara
Universidad de Guadalajara
Diltz, Chris
United States, Athens
Ohio University
Hovatta, Talvikki
Finland, Espoo
Aalto University
Kadenius, Ville
Finland, Turku
Turun Yliopisto
Kovalev, Y. Y.
United States, Seattle
University of Washington
Russian Federation, Moscow
P.n. Lebedev Physical Institute of the Russian Academy of Sciences
L¨ahteenm¨aki, Anne A.
Finland, Espoo
Aalto University
Lindfors, Elina J.
Finland, Turku
Turun Yliopisto
Marscher, Alan P.
United States, Boston
Boston University
Nilsson, Kari
Finland, Turku
Turun Yliopisto
Reinthal, Riho
Finland, Turku
Turun Yliopisto
Roustazadeh, Parisa
United States, Athens
Ohio University
Savolainen, Tuomas K.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Sillanp̈äa, Aimo K.
Finland, Turku
Turun Yliopisto
Takalo, Leo O.
Finland, Turku
Turun Yliopisto
Tornikoski, Merja
Finland, Espoo
Aalto University
Statistics
Citations: 52
Authors: 153
Affiliations: 55
Identifiers
Doi:
10.1088/0004-637X/730/2/101
ISSN:
0004637X
Research Areas
Cancer