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

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Abstract

The active galactic nucleus BL Lac was observed with the GT-48 atmospheric Cherenkov detector of the Crimean Astrophysical Observatory from July 23–September 1, 1998, in order to search for ultrahighenergy gamma-ray (>1 TeV) emission. The object was in the field of view of the detector for more than 24 hours. The source was detected with a high level of confidence (7.2 σ) with a flux equal to (2.1±0.4)×10−11 photons cm−2 s−1.

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Authors and Affiliations

  1. Crimean Astrophysical Observatory, p/o Nauchnyi, Crimea

    Yu. I. Neshpor, N. N. Chalenko, A. A. Stepanian, O. R. Kalekin, N. A. Jogolev, V. P. Fomin & V. G. Shitov

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  1. Yu. I. Neshpor
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  2. N. N. Chalenko
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  3. A. A. Stepanian
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  4. O. R. Kalekin
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  5. N. A. Jogolev
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  6. V. P. Fomin
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  7. V. G. Shitov
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__________

Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 78, No. 4, 2001, pp. 291–297.

Original Russian Text Copyright © 2001 by Neshpor, Chalenko, Stepanian, Kalekin, Jogolev, Fomin, Shitov.

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Neshpor, Y.I., Chalenko, N.N., Stepanian, A.A. et al. BL Lac: A new ultrahigh-energy gamma-ray source. Astron. Rep. 45, 249–254 (2001). https://doi.org/10.1134/1.1361316

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  • DOI: https://doi.org/10.1134/1.1361316

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