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19 April 2024

» arxiv » astro-ph/9712325

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Discovery of >350 GeV Gamma Rays from the BL Lacertae Object 1ES 2344+514
M. Catanese ; C. W. Akerlof ; H. M. Badran ; S. D. Biller ; I. H. Bond ; P. J. Boyle ; S. M. Bradbury ; J. H. Buckley ; A. M. Burdett ; J. Bussons Gordo ; D. A. Carter-Lewis ; M. F. Cawley ; V. Connaughton ; D. J. Fegan ; J. P. Finley ; J. A. Gaidos ; T. Hall ; A. M. Hillas ; F. Krennrich ; R. C. Lamb ; R. W. Lessard ; C. Masterson ; J. E. McEnery ; G. Mohanty ; J. Quinn ; A. J. Rodgers ; H. J. Rose ; F. W. Samuelson ; M. S. Schubnell ; G. H. Sembroski ; R. Srinivasan ; T. C. Weekes ; C. W. Wilson ; J. Zweerink ;
Date:	24 Dec 1997
Subject:	astro-ph
Abstract:	We present the discovery of >350 GeV gamma-ray emission from the BL Lacertae object 1ES 2344+514 with the Whipple Observatory 10m gamma-ray telescope. This is the third BL Lac object detected at gamma-ray energies above 300 Gev, the other two being Markarian 421 (Mrk 421) and Mrk501. These three active galactic nuclei are all X-ray selected and have the lowest known redshifts of any BL Lac objects currently identified. The evidence for emission derives primarily from an apparent flare on December 20, 1995 when a 6 sigma excess was detected with a flux approximately 63% of the very high energy gamma-ray emission from the Crab Nebula, the standard candle for TeV gamma-ray sources. Excluding the flare, observations between October 1995 and January 1996 yield a 4 sigma detection corresponding to 11% of the VHE Crab Nebula flux. Observations spanning September 1996 to January 1997 failed to yield a significant detection of a steady flux or any flaring. For this period, the 99.9% confidence level upper limit is <8% of the Crab Nebula. The low baseline emission level and variations in nightly and yearly flux of 1ES 22344+514 are the same as the VHE emission characteristics of Mrk 421 and Mrk 501
Source:	arXiv, astro-ph/9712325
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