Cutoff in the T[CLC]e[/CLC]V Energy Spectrum of Markarian 421 during Strong Flares in 2001
| Autor: | H. J. Rose, M. Catanese, M. J. Lang, J. A. Gaidos, I. H. Bond, G. H. Sembroski, J. P. Finley, I. de la Calle Perez, R. A. Ong, John Kildea, T. C. Weekes, B. McKernan, S. LeBohec, S. Dunlea, M. Kertzman, R. Pallassini, A. M. Hillas, R. Sidwell, M. Jordan, Frank Krennrich, J. Knapp, Wei Cui, S. P. Swordy, Dietrich Müller, K. Kosack, N. W. Reay, S. M. Bradbury, Jamie Holder, P. Moriarty, D. A. Carter-Lewis, N. Stanton, H. M. Badran, P. T. Reynolds, Tony Hall, J. H. Buckley, S. P. Wakely, David Kieda, John L. Quinn, K. G. Gibbs, D. J. Fegan, D. Das, Vladimir Vassiliev, D. Horan, S. J. Fegan, D. Petry, G. H. Gillanders |
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| Rok vydání: | 2001 |
| Předmět: |
Long lasting
mkn-501 Astrophysics::High Energy Astrophysical Phenomena hegra Astrophysics Power law objects blazar jet Energy spectrum Statistical precision photons Cutoff gamma rays : observations Blazar Background radiation Physics active galaxy markarian-421 Astronomy and Astrophysics gamma-rays acceleration Space and Planetary Science Spectral energy distribution High Energy Physics::Experiment bl lacertae objects : individual (markarian 421) cherenkov telescope system |
| Zdroj: | The Astrophysical Journal. 560:L45-L48 |
| ISSN: | 0004-637X |
| DOI: | 10.1086/324221 |
| Popis: | 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: $\rm {{dN}\over{dE}} \propto \rm E^{-2.14 \pm 0.03_{stat}} \times e^{-E/E_{0}} m^{-2} s^{-1} TeV^{-1}$ with $\rm E_{0} = 4.3 \pm 0.3_{stat} TeV$. 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. |
| Databáze: | OpenAIRE |
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