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Title:
STACEE Observations of Markarian 421 during an Extended Gamma-Ray Outburst
Authors:
Boone, L. M.; Hinton, J. A.; Bramel, D.; Chae, E.; Covault, C. E.; Fortin, P.; Gingrich, D. M.; Hanna, D. S.; Mukherjee, R.; Mueller, C.; Ong, R. A.; Ragan, K.; Scalzo, R. A.; Schuette, D. R.; Théoret, C. G.; Williams, D. A.
Affiliation:
AA(Santa Cruz Institute for Particle Physics, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064.), AB(Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637.; Present address: Max-Planck-Institut für Kernphysik, Postfach 10 39 80, D-69029 Heidelberg, Germany.), AC(Departments of Physics and Astronomy, Columbia University and Barnard College, New York, NY 10027.), AD(Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637.), AE(Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106.), AF(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AG(Centre for Subatomic Research, University of Alberta, Edmonton, AB T6G 2N5, Canada.; Tri-Universities Meson Facility, Vancouver, BC V6T 2A3, Canada.), AH(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AI(Departments of Physics and Astronomy, Columbia University and Barnard College, New York, NY 10027.), AJ(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AK(Department of Physics and Astronomy, University of California at Los Angeles, Box 951547, Knudsen Hall, Los Angeles, CA 90095-1547.), AL(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AM(Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637.), AN(Department of Physics and Astronomy, University of California at Los Angeles, Box 951547, Knudsen Hall, Los Angeles, CA 90095-1547.; Present address: Department of Physics, Cornell University, Ithaca, NY 14853.), AO(Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.; Present address: Laboratoire de Physique Corpusculaire et Cosmologie, Collège de France, F-75231 Paris, Cedex 5, France.), AP(Santa Cruz Institute for Particle Physics, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064.)
Publication:
The Astrophysical Journal, Volume 579, Issue 1, pp. L5-L8. (ApJ Homepage)
Publication Date:
11/2002
Origin:
UCP
ApJ Keywords:
Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421, Galaxies: Active, Gamma Rays: Observations
Abstract Copyright:
(c) 2002: The American Astronomical Society
DOI:
10.1086/344815
Bibliographic Code:
2002ApJ...579L...5B

Abstract

The active galaxy Markarian 421 underwent a substantial outburst in early 2001. Between January and May of that year, the STACEE detector was used to observe the source in γ-rays between the energies of 50 and 500 GeV. These observations represent the lowest energy γ-ray detection of this outburst by a ground-based experiment. Here we present results from these observations, which indicate an average integral γ-ray flux of (8.0+/-0.7+/-1.5)×10-10 cm-2 s-1 above 140 GeV. We also present a light curve for Markarian 421 as observed by STACEE from March to May and compare our temporal, as well as spectral, measurements with those of other experiments.
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