BL Lac: A new ultrahigh-energy gamma-ray source

Authors
Neshpor, YI Chalenko, NN Stepanian, AA Kalekin, OR Jogolev, NA Fomin, VP Shitov, VG
Citation
Yi. Neshpor et al., BL Lac: A new ultrahigh-energy gamma-ray source, ASTRON REP, 45(4), 2001, pp. 249-254
Citations number
24
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY REPORTS
ISSN journal
10637729 → ACNP
Volume
45
Issue
4
Year of publication
2001
Pages
249 - 254
Database
ISI
SICI code
1063-7729(200104)45:4<249:BLANUG>2.0.ZU;2-A
Abstract
The active galactic nucleus BL Lac was observed with the GT-48 atmospheric Cherenkov detector of the Crimean Astrophysical Observatory from July 23-Se ptember 1, 1998, in order to search for ultrahigh-energy gamma-ray (>1 TeV) emission. The object was in the field of view of the detector for more tha n 24 hours. The source was detected with a high level of confidence (7.2 si gma), with a flux equal to (2.1 +/- 0.4) X 10(-11) photons cm(-2) s(-1). (C ) 2001 MAIK "Nauka/Interperiodica".