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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



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ID: 542937.0, MPI für Physik / MPI für Physik
Observations of 54 Active Galactic Nuclei with the HEGRA System of Cherenkov Telescopes
Authors:The HEGRA Collaboration; Aharonian, F.; Akhperjanian, A.; Beilicke, M.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Astronomy &Amp; Astrophysics
Journal Abbrev.:Astron.Astrophys.
Issue / Number:421
Start Page:529
End Page:537
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic system of Cherenkov Telescopes between 1996 and 2002 in the TeV energy regime. The observations were motivated by the positive results obtained for Mkn 421 and Mkn 501. The distances of the selected objects vary over a large range of redshifts between z = 0.004 and z = 0.7. Among the observed AGN are the meanwhile established TeV-emitting BL Lac type objects H1426+428 and 1ES1959+650. Furthermore the BL Lac object 1ES2344+514 and the radio galaxy M87 show evidence for a signal on a 4 sigma level. The observation of 1ES2344+514 together with the Whipple results firmly establishes this AGN as a TeV source. Several objects (PKS2155-304, BL Lacertae, 3C066A) that have been claimed as TeV gamma-ray emitters by other groups are included in this data sample but could not be confirmed using data analysed here. The upper limits of several AGN included in this analysis are compared with predictions in the frame-work of SSC models.
Classification / Thesaurus:HEGRA
Comment of the Author/Creator:9 pages, 2 figures, 7 tables, submitted to A&A
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2004-24
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/astro-ph/0401301
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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