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23 April 2024

» arxiv » astro-ph/9912520

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Search for Pulsed TeV Gamma-ray Emission from the Crab Pulsar
R.W. Lessard ; I.H. Bond ; S.M. Bradbury ; J.H. Buckley ; A.M. Burdett ; D.A. Carter-Lewis ; M. Catanese ; M.F. Cawley ; M. D’Vali ; D.J. Fegan ; J.P. Finley ; J.A. Gaidos ; G.H. Gillanders ; T. Hall ; A.M. Hillas ; F. Krennrich ; M.J. Lang ; C. Masterson ; P. Moriarty ; J. Quinn ; H.J. Rose ; F.W. Samuelson ; G.H. Sembroski ; R. Srinivasan ; V.V. Vassiliev ; T.C. Weekes ;
Date:	27 Dec 1999
Subject:	astro-ph
Abstract:	We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory’s 10 m gamma-ray telescope. The direction of the Crab pulsar was observed for a total of 73.4 hours between 1994 November and 1997 March. During this period the Whipple 10 m telescope was operated at its lowest energy threshold to date. Spectral analysis techniques were applied to search for the presence of a gamma-ray signal from the Crab pulsar over the energy band 250 GeV to 4 TeV. We do not see any evidence of the 33 ms pulsations present in other energy bands from the Crab pulsar. The 99.9% confidence level upper limit for pulsed emission above 250 GeV is derived to be 4.8x10^-12 cm^-2 s^-1 or <3% of the steady flux from the Crab Nebula. These results imply a sharp cut-off of the power-law spectrum seen by the EGRET instrument on the Compton Gamma-Ray Observatory. If the cut-off is exponential, it must begin at 60 GeV or lower to accommodate these upper limits.
Source:	arXiv, astro-ph/9912520
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