Publication

Cutoff in the t[clc]e[/clc]v energy spectrum of markarian 421 during strong flares in 2001

Krennrich, F.
; 
Badran, H. M.
; 
Bond, I. H.
; 
Bradbury, S. M.
; 
Buckley, J. H.
; 
Carter-Lewis, D. A.
; 
Catanese, M.
; 
Cui, W.
; 
Dunlea, S.
; 
Das, D.
... show 10 more
Identifiers
http://hdl.handle.net/10379/9412
https://doi.org/10.13025/24131
Repository DOI
10.1086/324221
Publication Date
2001-10-10
Keywords
bl lacertae objects : individual (markarian 421), gamma rays : observations, active galaxy markarian-421, cherenkov telescope system, gamma-rays, mkn-501, acceleration, objects, photons, blazar, hegra, jet
Type
Article
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Citation
Krennrich, F. Badran, H. M.; Bond, I. H.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Catanese, M.; Cui, W.; Dunlea, S.; Das, D.; de la Calle Perez, I.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Gaidos, J. A.; Gibbs, K.; Gillanders, G. H.; Hall, T. A.; Hillas, A. M.; Holder, J.; Horan, D.; Jordan, M.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Lang, M. J.; LeBohec, S.; McKernan, B.; Moriarty, P.; Müller, D.; Ong, R.; Pallassini, R.; Petry, D.; Quinn, J.; Reay, N. W.; Reynolds, P. T.; Rose, H. J.; Sembroski, G. H.; Sidwell, R.; Stanton, N.; Swordy, S. P.; Vassiliev, V. V.; Wakely, S. P.; Weekes, T. C. (2001). Cutoff in the t[clc]e[/clc]v energy spectrum of markarian 421 during strong flares in 2001. The Astrophysical Journal 560 (1), L45-L48
Abstract
Exceptionally strong and long- lasting flaring activity of the blazar Mrk 421 occurred between 2001 January and March. Based on the excellent signal- to- noise ratio of the data, we derive the energy spectrum between 260 GeV and 17 TeV with unprecedented statistical precision. The spectrum is not well described by a simple power law even with a curvature term. Instead, the data can be described by a power law with exponential cutoff: dN/dE proportional to E(-2.14 +/-0.03 stat)e(-E/E0) m(-2) s(-1) TeV-1 with E0=4.3 +/-0.3(stat) TeV. Mrk 421 is the second gamma -ray blazar that unambiguously exhibits an absorption- like feature in its spectral energy distribution at 3-6 TeV.
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Publisher
IOP Publishing
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Rights
Attribution-NonCommercial-NoDerivs 3.0 Ireland
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Externally hosted open access publications with University of Galway authors (1)