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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Multiwavelength observations of the blazar markarian 421 in 2002 December and 2003 January
Astrophysical Journal, Volume 641, No. 2 I, Year 2006
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Description
We report on a multiwavelength campaign on the TeV γ-ray blazar Mrk 421 performed during 2002 December and 2003 January. These target of opportunity observations were initiated by the detection of X-ray and TeV γ-ray flares with the All Sky Monitor (ASM) on board the RossiX-Ray Timing Explorer (RXTE) and the 10 m Whipple γ-ray telescope. The campaign included observational coverage in the radio (University of Michigan Radio Astronomy Observatory), optical (Boltwood, La Palma KVA 0.6 m; WIYN 0.9 m), X-ray (RXTE pointed telescopes), and TeV γ-ray (Whipple and HEGRA) bands. At TeV energies, the observations revealed several flares at intermediate flux levels, peaking between 1 and 1.5 times the flux from the Crab Nebula. While the time-averaged spectrum can be fitted with a single power law of photon index Γ = 2.8 from dNγ/dE ∝ E-Γ, we find some evidence for spectral variability. Confirming earlier results, the campaign reveals a rather loose correlation between the X-ray and TeV γ-ray fluxes. In one case, a very strong X-ray flare is not accompanied by a comparable TeV γ-ray flare. Although the source flux was variable in the optical and radio bands, the sparse sampling of the optical and radio light curves does not allow us to study the correlation properties in detail. We present a simple analysis of the data with a synchrotron self-Compton model, emphasizing that models with very high Doppler factors and low magnetic fields can describe the data. © 2006. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Rebillot, Paul F.
United States, St. Louis
Washington University in St. Louis
Badran, Hussein M.
Egypt, Tanta
Tanta University
Blaylock, Guy T.
United States, Amherst
University of Massachusetts Amherst
Bradbury, Stella M.
United Kingdom, Leeds
University of Leeds
Buckley, James H.
United States, St. Louis
Washington University in St. Louis
Carter-Lewis, D. A.
United States, Ames
Iowa State University
Çelik, Ö. Ö.
United States, Los Angeles
University of California, Los Angeles
Chow, Y. C.K.
United States, Los Angeles
University of California, Los Angeles
Cogan, Peter
Ireland, Galway
University of Galway
Cui, Wei
United States, West Lafayette
Purdue University
Daniel, Michael K.
Ireland, Galway
University of Galway
Duke, Charles B.
United States, Grinnell
Grinnell College
Falcone, Abraham D.
United States, West Lafayette
Purdue University
Fegan, Stephen J.
United States, Los Angeles
University of California, Los Angeles
Finley, John P.
United States, West Lafayette
Purdue University
Fortson, Lucy F.
United States, Chicago
The University of Chicago
United States, Chicago
Adler Planetarium
Gillanders, G. H.
Ireland, Galway
University of Galway
Grube, J.
United Kingdom, Leeds
University of Leeds
Gutierrez, K. J.
United States, St. Louis
Washington University in St. Louis
Gyuk, Geza
United States, Chicago
The University of Chicago
United States, Chicago
Adler Planetarium
Hanna, David S.
Canada, Montreal
Université Mcgill
Holder, Jamie A.
United Kingdom, Leeds
University of Leeds
Horan, Deirdre
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Hughes, S. B.
United States, St. Louis
Washington University in St. Louis
Kenny, G. E.
Ireland, Galway
University of Galway
Kertzman, M. P.
United States, Greencastle
Depauw University
Kieda, David B.
United States, Salt Lake City
The University of Utah
Kildea, John
Canada, Montreal
Université Mcgill
Kosack, Karl
United States, St. Louis
Washington University in St. Louis
Krawczynski, Henric S.
United States, St. Louis
Washington University in St. Louis
Krennrich, Frank
United States, Ames
Iowa State University
Lang, Mark J.
Ireland, Galway
University of Galway
Le Bohec, S.
United States, Salt Lake City
The University of Utah
Linton, E. T.
United States, Chicago
The Enrico Fermi Institute
Maier, Gernot
United Kingdom, Leeds
University of Leeds
Moriarty, P.
Ireland, Killybegs
Atlantic Technological University
Perkins, Jeremy S.
United States, St. Louis
Washington University in St. Louis
Pohl, Martin
United States, Ames
Iowa State University
Quinn, John
Ireland, Galway
University of Galway
Ragan, K. J.
Canada, Montreal
Université Mcgill
Reynolds, P. T.
Ireland, Bishopstown
Munster Technological University Mtu
Rose, H. J.
United Kingdom, Leeds
University of Leeds
Schroedter, Martin
United States, Ames
Iowa State University
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Sembroski, Glenn H.
United States, West Lafayette
Purdue University
Steele, G.
United States, Chicago
Adler Planetarium
Swordy, Simon P.
United States, Chicago
The Enrico Fermi Institute
Valcárcel, Luis
Canada, Montreal
Université Mcgill
Vassilev, V. V.
United States, Los Angeles
University of California, Los Angeles
Wakely, Scott P.
United States, Chicago
The Enrico Fermi Institute
Weekes, Trevor C.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Zweerink, Jeffrey A.
United States, Los Angeles
University of California, Los Angeles
Aller, M. F.
United States, Ann Arbor
University of Michigan, Ann Arbor
Aller, Hugh D.
United States, Ann Arbor
University of Michigan, Ann Arbor
Boltwood, P.
Canada
Boltwood Observatory
Jung-Richardt, Ira V.
United States, St. Louis
Washington University in St. Louis
Kranich, Daniel
United States, Davis
University of California, Davis
Nilsson, Kari
Finland, Kaarina
Tuorlan Observatorio
Pasanen, Mikko
Finland, Kaarina
Tuorlan Observatorio
Sadun, Alberto C.
United States, Denver
University of Colorado Denver
Sillanp̈äa, Aimo K.
Finland, Kaarina
Tuorlan Observatorio
Statistics
Citations: 60
Authors: 60
Affiliations: 23
Identifiers
Doi:
10.1086/500653
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Health System And Policy