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18 April 2024

» arxiv » astro-ph/0107113

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Cutoff in the TeV Energy Spectrum of Markarian 421 During Strong Flares in 2001
F. Krennrich ; H.M. Badran ; I.H. Bond ; S.M. Bradbury ; J.H. Buckley ; D.A. Carter-Lewis ; M. Catanese ; W. Cui ; S. Dunlea ; D. Das ; I. de la Calle Perez ; D.J. Fegan ; S.J. Fegan ; J.P. Finley ; J.A. Gaidos ; K. Gibbs ; G.H. Gillanders ; T.A. Hall ; A.M. Hillas ; J. Holder ; D. Horan ; M. Jordan ; M. Kertzman ; D. Kieda ; J. Kildea ; J. Knapp ; K. Kosack ; M.J. Lang ; S. LeBohec ; B. McKernan ; P. Moriarty ; D. Müller ; R. Ong ; R. Pallassini ; D. Petry ; J. Quinn ; N.W. Reay ; P.T. Reynolds ; H.J. Rose ; G.H. Sembroski ; R. Sidwell ; N. Stanton ; S.P. Swordy ; V.V. Vassiliev ; S.P. Wakely ; T.C. Weekes ;
Date:	6 Jul 2001
Journal:	Astrophys.J. 560 (2001) L45-L48
Subject:	astro-ph
Abstract:	Exceptionally strong and long lasting flaring activity of the blazar Markarian 421 (Mrk 421) occurred between January and March 2001. Based on the excellent signal-to-noise ratio of the data we derive the energy spectrum between 260 GeV - 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: $ m {{dN}over{dE}} propto m E^{-2.14 pm 0.03_{stat}} imes e^{-E/E_{0}} m^{-2} s^{-1} TeV^{-1}$ with $ m E_{0} = 4.3 pm 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 suggesting that this may be a universal phenomenon, possibly due to the extragalactic infra-red background radiation.
Source:	arXiv, astro-ph/0107113
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