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19 April 2024 |
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The Energy Spectrum of the Blazar Markarian 421 Above 130 GeV | | J.E. Carson
; J. Kildea
; R. A. Ong
; J. Ball
; D. A. Bramel
; C. E. Covault
; D. Driscoll
; P. Fortin
; D. M. Gingrich
; D. S. Hanna
; T. Lindner
; C. Mueller
; A. Jarvis
; R. Mukherjee
; K. Ragan
; R. A. Scalzo
; D. A. Williams
; J. Zweerink
; | | Date: |
19 Dec 2006 | | Abstract: | Markarian 421 (Mrk 421) was the first blazar detected at gamma-ray energies above 300 GeV, and it remains one of only twelve TeV blazars detected to date. TeV gamma-ray measurements of its flaring activity and spectral variability have placed constraints on models of the high-energy emission from blazars. However, observations between 50 and 300 GeV are rare, and the high-energy peak of the spectral energy distribution (SED), predicted to be in this range, has never been directly detected. We present a detection of Mrk 421 above 100 GeV as made by the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) during a multiwavelength campaign in early 2004. STACEE is a ground-based atmospheric Cherenkov telescope using the wavefront sampling technique to detect gamma rays at lower energies than achieved by most imaging Cherenkov telescopes. We also outline a method for reconstructing gamma-ray energies using a solar heliostat telescope. This technique was applied to the 2004 data, and we present the differential energy spectrum of Mrk 421 above 130 GeV. Assuming a differential photon flux dN/dE proportional to E^-a, we measure a spectral index a = 2.1 +/- 0.2 (statistical) +0.2/-0.1 (systematic). Finally, we discuss the STACEE spectrum in the context of the multiwavelength results from the same epoch. | | Source: | arXiv, astro-ph/0612562 | | Services: | Forum | Review | PDF | Favorites | |
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