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.
| Original language | English (Ireland) |
|---|---|
| Number of pages | 4 |
| Journal | Astrophysical Journal |
| Volume | 560 |
| DOIs | |
| Publication status | Published - 1 Oct 2001 |
Authors (Note for portal: view the doc link for the full list of authors)
- Authors
- Krennrich, F,Badran, HM,Bond, IH,Bradbury, SM,Buckley, JH,Carter-Lewis, DA,Catanese, M,Cui, W,Dunlea, S,Das, D,Perez, ID,Fegan, DJ,Fegan, SJ,Finley, JP,Gaidos, JA,Gibbs, K,Gillanders, GH,Hall, TA,Hillas, AM,Holder, J,Horan, D,Jordan, M,Kertzman, M,Kieda, D,Kildea, J,Knapp, J,Kosack, K,Lang, MJ,LeBohec, S,McKernan, B,Moriarty, P,Muller, D,Ong, R,Pallassini, R,Petry, D,Quinn, J,Reay, NW,Reynolds, PT,Rose, HJ,Sembroski, GH,Sidwell, R,Stanton, N,Swordy, SP,Vassiliev, VV,Wakely, SP,Weekes, TC
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