Journal
ASTROPHYSICAL JOURNAL
Volume 595, Issue 2, Pages 803-811Publisher
IOP PUBLISHING LTD
DOI: 10.1086/377498
Keywords
gamma rays : observations; instrumentation : detectors; ISM : individual (Crab Nebula); stars : neutron; supernova remnants
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The recent advances in TeV gamma-ray astronomy are largely the result of the ability to differentiate between extensive air showers generated by gamma rays and hadronic cosmic rays. Air Cerenkov telescopes have developed and perfected the imaging '' technique over the past several decades. However, until now no background rejection method has been successfully used in an air shower array to detect a source of TeV gamma rays. We report on a method to differentiate hadronic air showers from electromagnetic air showers in the Milagro gamma-ray observatory, based on the ability to detect the energetic particles in an extensive air shower. The technique is used to detect TeV emission from the Crab Nebula. The flux from the Crab Nebula is estimated to be 2.68 (+/-0.42(stat) +/- 1.4(sys)) x 10(-7) (E/1 TeV)(-2.59) m(-2) s(-1) TeV-1, where the spectral index is assumed to be as given by the HEGRA collaboration.
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