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Astronomy and Astrophysics 459 (2006) 453-464
Mrk 421, Mrk 501, and 1ES 1426+428 at 100 GeV with the CELESTE Cherenkov Telescope
D.A. Smith1, E. Brion1, R. Britto2, P. Bruel3, J. Bussons Gordo2, D. Dumora1, E. Durand1, P. Eschstruth4, P. Espigat5, J. Holder4, A. Jacholkowska2, J. Lavalle2, R. Le Gallou1, B. Lott1, H. Manseri3, F. Münz5, E. Nuss2, F. Piron2, R.C. Rannot1, 2, T. Reposeur1, T. Sako3
CELESTE Collaboration(s)

We have measured the gamma-ray fluxes of the blazars Mrk 421 and Mrk 501 in the energy range between 50 and 350 GeV (1.2 to 8.3 x 10^25 Hz). The detector, called CELESTE, used first 40, then 53 heliostats of the former solar facility "Themis" in the French Pyrenees to collect Cherenkov light generated in atmospheric particle cascades. The signal from Mrk 421 is often strong. We compare its flux with previously published multi-wavelength studies and infer that we are straddling the high energy peak of the spectral energy distribution. The signal from Mrk 501 in 2000 was weak (3.4 sigma). We obtain an upper limit on the flux from 1ES 1426+428 of less than half that of the Crab flux near 100 GeV. The data analysis and understanding of systematic biases have improved compared to previous work, increasing the detector's sensitivity.
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
3 :  LLR - Laboratoire Leprince-Ringuet
4 :  LAL - Laboratoire de l'Accélérateur Linéaire
5 :  APC - UMR 7164 - AstroParticule et Cosmologie
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
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