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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A SEARCH for SPECTRAL HYSTERESIS and ENERGY-DEPENDENT TIME LAGS from X-RAY and TeV GAMMA-RAY OBSERVATIONS of Mrk 421
Astrophysical Journal, Volume 834, No. 1, Article 2, Year 2017
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Description
Blazars are variable emitters across all wavelengths over a wide range of timescales, from months down to minutes. It is therefore essential to observe blazars simultaneously at different wavelengths, especially in the X-ray and gamma-ray bands, where the broadband spectral energy distributions usually peak. In this work, we report on three "target-of-opportunity" observations of Mrk 421, one of the brightest TeV blazars, triggered by a strong flaring event at TeV energies in 2014. These observations feature long, continuous, and simultaneous exposures with XMM-Newton (covering the X-ray and optical/ultraviolet bands) and VERITAS (covering the TeV gamma-ray band), along with contemporaneous observations from other gamma-ray facilities (MAGIC and Fermi-Large Area Telescope) and a number of radio and optical facilities. Although neither rapid flares nor significant X-ray/TeV correlation are detected, these observations reveal subtle changes in the X-ray spectrum of the source over the course of a few days. We search the simultaneous X-ray and TeV data for spectral hysteresis patterns and time delays, which could provide insight into the emission mechanisms and the source properties (e.g., the radius of the emitting region, the strength of the magnetic field, and related timescales). The observed broadband spectra are consistent with a one-zone synchrotron self-Compton model. We find that the power spectral density distribution at 4 ×10-4 Hz from the X-ray data can be described by a power-law model with an index value between 1.2 and 1.8, and do not find evidence for a steepening of the power spectral index (often associated with a characteristic length scale) compared to the previously reported values at lower frequencies. © 2016. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Archambault, Simon
Canada, Montreal
Université Mcgill
Archer, Avery
United States, St. Louis
Washington University in St. Louis
Benbow, Wystan R.
United States, Amado
Fred Lawrence Whipple Observatory
Bird, Ralph
United States, Los Angeles
University of California, Los Angeles
Buchovecky, M.
United States, Los Angeles
University of California, Los Angeles
Buckley, James H.
United States, St. Louis
Washington University in St. Louis
Bugaev, Viatcheslav V.
United States, St. Louis
Washington University in St. Louis
Cardenzana, Joshua V.
United States, Ames
Iowa State University
Cerruti, Matteo
United States, Amado
Fred Lawrence Whipple Observatory
Chen, Xuhui
Germany, Potsdam
Universität Potsdam
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Ciupik, Larry
United States, Chicago
Adler Planetarium
Connolly, M. P.
Ireland, Galway
University of Galway
Cui, Wei
United States, West Lafayette
Purdue University
China, Beijing
National Astronomical Observatories Chinese Academy of Sciences
Eisch, J. D.
United States, Ames
Iowa State University
Falcone, Abraham D.
United States, University Park
Pennsylvania State University
Feng, Qi
Canada, Montreal
Université Mcgill
Finley, John P.
United States, West Lafayette
Purdue University
Fleischhack, Henrike
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Flinders, Andy
United States, Salt Lake City
The University of Utah
Fortson, Lucy F.
United States, Minneapolis
University of Minnesota Twin Cities
Furniss, Amy K.
United States, Hayward
California State University, East Bay
Griffin, Sean C.
Canada, Montreal
Université Mcgill
Hanna, David S.
Canada, Montreal
Université Mcgill
Hervet, Olivier
United States, Santa Cruz
University of California, Santa Cruz
Holder, Jamie A.
United States, Newark
University of Delaware
Humensky, T. B.
United States, New York
Columbia University
Kaaret, Phillip E.
United States, Iowa City
University of Iowa
Kar, Payel
United States, Salt Lake City
The University of Utah
Kertzman, M. P.
United States, Greencastle
Depauw University
Kieda, David B.
United States, Salt Lake City
The University of Utah
Krause, Maria
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Kumar, Sajan
United States, Newark
University of Delaware
Lang, Mark J.
Ireland, Galway
University of Galway
Maier, Gernot
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
McArthur, Scot P.
United States, West Lafayette
Purdue University
McCann, Andrew J.
Canada, Montreal
Université Mcgill
Meagher, Kevin J.
United States, Atlanta
Georgia Institute of Technology
Moriarty, P.
Ireland, Galway
University of Galway
Mukherjee, Reshmi
United States, New York
Columbia University
Nieto, Daniel
United States, New York
Columbia University
Otte, Adam Nepomuk
United States, Atlanta
Georgia Institute of Technology
Park, Nahee
United States, Chicago
The University of Chicago
Pelassa, Vèronique
United States, Amado
Fred Lawrence Whipple Observatory
Pohl, Martin
Germany, Potsdam
Universität Potsdam
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Popkow, Alexis
United States, Los Angeles
University of California, Los Angeles
Pueschel, Elisa
Ireland, Dublin
University College Dublin
Ragan, K. J.
Canada, Montreal
Université Mcgill
Reynolds, P. T.
Ireland, Bishopstown
Munster Technological University Mtu
Richards, Gregory T.
United States, Atlanta
Georgia Institute of Technology
Roache, Emmet T.
United States, Amado
Fred Lawrence Whipple Observatory
Sadeh, Iftach H.
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Santander, Marcos
United States, New York
Columbia University
Sembroski, Glenn H.
United States, West Lafayette
Purdue University
Shahinyan, Karlen
United States, Minneapolis
University of Minnesota Twin Cities
Staszak, David
United States, Chicago
The University of Chicago
Telezhinsky, Igor O.
Germany, Potsdam
Universität Potsdam
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Tucci, J. V.
United States, West Lafayette
Purdue University
Tyler, Jonathan B.
Canada, Montreal
Université Mcgill
Wakely, Scott P.
United States, Chicago
The University of Chicago
Weinstein, Amanda
United States, Ames
Iowa State University
Wilhelm, Andrew S.
Germany, Potsdam
Universität Potsdam
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Williams, David A.
United States, Santa Cruz
University of California, Santa Cruz
Ahnen, Max L.
Switzerland, Zurich
Eth Zürich
Ansoldi, Stefano
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Japan, Kyoto
Kyoto University
Antonelli, Lucio Angelo
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Antoranz, Pedro
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Arcaro, Cornelia H.E.
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Babić, Ana
Croatia, Zagreb
University of Zagreb
Banerjee, Biswajit
India, Kolkata
Saha Institute of Nuclear Physics
Bangale, Priyadarshini
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Barrio, Juan Abel
Spain, Madrid
Universidad Complutense de Madrid
Becerra González, Josefa
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Bednarek, Włodzimierz
Poland, Lodz
University of Lodz
Bernardini, Elisa
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Germany, Berlin
Humboldt-universität zu Berlin
Berti, Alessio
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Università Degli Studi Di Trieste
Biasuzzi, Barbara
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Biland, Adrian
Switzerland, Zurich
Eth Zürich
Blanch, Oscar
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Bonnefoy, Simon
Spain, Madrid
Universidad Complutense de Madrid
Bonnoli, Giacomo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Borracci, F.
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Bretz, Thomas
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Switzerland, Lausanne
École Polytechnique Fédérale de Lausanne
Carosi, Roberto
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Carosi, Alessandro
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Colin, Pierre
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Colombo, E.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Contreras, José Luis
Spain, Madrid
Universidad Complutense de Madrid
Cortina, J.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Covino, Stefano
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Cumani, P.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
da Vela, Paolo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Dazzi, Francesco
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
De Angelis, Alessandro D.
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
De Lotto, Barbara
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
De Oña Wilhelmi, Emma
Spain, Barcelona
Csic - Instituto de Ciencias Del Espacio Ice
Di Pierro, F.
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Doert, Marlene
Germany, Dortmund
Technische Universität Dortmund
Domínguez, A. D.
Spain, Madrid
Universidad Complutense de Madrid
Prester, Dijana Dominis
Croatia, Zagreb
University of Zagreb
Dorner, Daniela
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Doro, Michele
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Einecke, Sabrina
Germany, Dortmund
Technische Universität Dortmund
Glawion, Dorit Eisenacher
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Elsässer, Dominik
Germany, Dortmund
Technische Universität Dortmund
Engelkemeier, M.
Germany, Dortmund
Technische Universität Dortmund
Fallah Ramazani, Vandad
Finland, Turku
Turun Yliopisto
Fernandez-Barral, Alba
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Fidalgo, David Carreto
Spain, Madrid
Universidad Complutense de Madrid
Fonseca, M. V.
Spain, Madrid
Universidad Complutense de Madrid
Font, Ll L.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Fruck, Christian
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Galindo, Daniel
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Garczarczyk, Markus
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Gaug, Markus
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Giammaria, P.
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Godinović, Nikola
Croatia, Zagreb
University of Zagreb
Góra, Dariusz
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Guberman, D.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Hadasch, Daniela
Japan, Tokushima
Tokushima University
Hahn, A.
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Hassan, Tarek
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Hayashida, Masaaki
Japan, Tokushima
Tokushima University
Herrera, Juan Carlos Helo
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Hose, Juergen
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Hrupec, Dario
Croatia, Zagreb
University of Zagreb
Hughes, Gareth A.
Switzerland, Zurich
Eth Zürich
Konno, Yusuke
Japan, Tokushima
Tokushima University
Kubo, Hidetoshi
Japan, Tokushima
Tokushima University
Kushida, Junko
Japan, Tokushima
Tokushima University
Lelas, Damir
Croatia, Zagreb
University of Zagreb
Lindfors, Elina J.
Finland, Turku
Turun Yliopisto
Lombardi, Saverio
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Longo, Francesco
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Università Degli Studi Di Trieste
López-Moya, Marcos
Spain, Madrid
Universidad Complutense de Madrid
López-Coto, Rubén
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Majumdar, Pratik
India, Kolkata
Saha Institute of Nuclear Physics
Makariev, M. V.
Bulgaria, Sofia
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Maneva, Galina M.
Bulgaria, Sofia
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Manganaro, Marina
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Mannheim, Karl
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Maraschi, Laura
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Marcote, Benito
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Mariotti, M.
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Martínez, Manel
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Mazin, Daniel
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Japan, Kyoto
Japanese Magic Consortium
Menzel, Uta
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Mirzoyan, Razmik G.
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Moralejo, Abelardo
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Moretti, Elena
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Neustroev, Vitaly V.
Finland, Turku
Turun Yliopisto
Maciołek-Niedźwiecki, Andrzej
Poland, Lodz
University of Lodz
Nievas-Rosillo, M.
Spain, Madrid
Universidad Complutense de Madrid
Nilsson, Kari
Finland, Turku
Turun Yliopisto
Nishijima, Kyoshi
Japan, Tokushima
Tokushima University
Noda, Koji
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Nogués, Leyre
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Noethe, Maximilian
Germany, Dortmund
Technische Universität Dortmund
Paiano, Simona
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Palacio, Joaquim
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Palatiello, Michele
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Paneque, David
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Paoletti, Riccardo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Paredes, Josep Maria
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Pedaletti, Giovanna
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Persic, Massimo
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Osservatorio Astronomico Di Trieste
Poutanen, Juri
Finland, Turku
Turun Yliopisto
Prada Moroni, Pier Giorgio
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Prandini, Elisa
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Puljak, Ivica
Croatia, Zagreb
University of Zagreb
Rhode, Wolfgang
Germany, Dortmund
Technische Universität Dortmund
Ribó, Marc
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Rico, Javier R.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Schweizer, Thomas
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Shore, Steven N.
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Sitarek, Julian
Poland, Lodz
University of Lodz
Sobczyńska, Dorota
Poland, Lodz
University of Lodz
Stamerra, Antonio
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Takalo, Leo O.
Finland, Turku
Turun Yliopisto
Tavecchio, Fabrizio
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Terzić, Tomislav
Croatia, Zagreb
University of Zagreb
Teshima, Masahiro
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Torres, Diego F.
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Treves, Aldo
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Vazquez Acosta, Monica
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Vovk, Ievgen
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Ward, John Ennis
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Zanin, Roberta
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Hovatta, Talvikki
Finland, Espoo
Aalto University
de la Calle Pérez, I.
France, Paris
European Space Agency - Esa
Smith, Paul S.
United States, Tucson
The University of Arizona
Baloković, Mislav
United States, Pasadena
California Institute of Technology
Statistics
Citations: 25
Authors: 191
Affiliations: 59
Identifiers
Doi:
10.3847/1538-4357/834/1/2
ISSN:
0004637X
Research Areas
Environmental