학술논문
Upper limits on low redshift AGN.
Document Type
Article
Author
Source
Subject
*REDSHIFT
*ACTIVE galactic nuclei
*BL Lacertae objects
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*
Language
ISSN
0094-243X
Abstract
The HEGRA IACT stereoscopic system, with an energy threshold of about 0.5 TeV, was used to search for γ-ray emission of several low redshift AGN (z<0.2), mostly BL Lacs. Here we present the results of observations that were made since June 1997 at zenith angles up to 40°. No evidence for TeV emission is detected and the corresponding upper limits in Crab units are given. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]