Abstract
We present two-year-long observations of the flux of very-high-energy (∼1012 eV) gamma rays from the active galactic nucleus Mk 501 performed with a Cherenkov detector at the Crimean Astrophysical Observatory. A gamma-ray flux from the object was shown to exist at confidence levels of 11 and 7 standard deviations for 1997 and 1998, respectively. The flux varied over a wide range. The mean flux at energies >1012 eV, as inferred from the 1997 and 1998 data, is (5.0±0.6)×10−11 and (3.7±0.6)×10−11 cm−2 s−1, respectively. The errors are the sum of statistical observational and modeling errors. The mean power released in the form of gamma rays is ∼2×1043 erg s−1 sr−1.
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References
D. J. Thompson, D. L. Bertsch, B. L. Dingus, et al., Astrophys. J., Suppl. Ser. 101, 259 (1995).
J. Quinn, C. W. Akerlof, S. Biller, et al., Astrophys. J. Lett. 456, L83 (1996).
F. Krennrich, J. Boyle, J. H. Buckley, et al., The Kruger National Park Workshop on TeV Gamma Ray Astrophysics, Ed. by O. C. de Jager (Potchefstroom Univ., Potchefstroom, 1997), p. 38.
F. Aharonian, A. G. Akhperjanian, J. A. Barrio, et al., Astron. Astrophys. 327, L5 (1997).
A. Djannati-Atai, The Kruger National Park Workshop on TeV Gamma Ray Astrophysics, Ed. by O. C. de Jager (Potchefstroom Univ., Potchefstroom, 1997), p. 21.
N. Hayashida, H. Hirasawa, F. Ishikawa, et al., Astrophys. J. Lett. 504, L71 (1998).
O. R. Kalekin, N. N. Chalenko, Yu. L. Zyskin, et al., Izv. Ross. Akad. Nauk, Ser. Fiz. 63, 606 (1999).
B. M. Vladimirskii, Yu. L. Zyskin, A. P. Kornienko, et al., Izv. Krym. Astrofiz. Obs. 91, 74 (1995).
O. R. Kalekin, Yu. I. Neshpor, A. A. Stepanian, et al., Pis'ma Astron. Zh. 21, 184 (1995).
M. F. Cawley, J. Clear, D. J. Fegan, M. J. Lang, et al., Exp. Astron. 1, 173 (1990).
O. R. Kalekin, Izv. Krym. Astrofiz. Obs. 95, 167 (1999).
C. W. Akerlof, M. F. Cawley, M. Chantell, et al., Astrophys. J. Lett. 377, L97 (1991).
Yu. I. Neshpor, A. P. Kornienko, A. A. Stepanian, and Yu. L. Zyskin, Exp. Astron. 5, 405 (1994).
V. P. Fomin, S. Fennell, R. C. Lamb, et al., Astroparticle Phys. 2, 151 (1994).
M. Catanese, S. M. Bradbury, A. C. Breslin, et al., Astrophys. J. Lett. 487, L143 (1997).
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Translated from Pis 'ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 26, No. 4, 2000, pp. 243–248.
Original Russian Text Copyright © 2000 by Andreeva, Zyskin, Kalekin, Neshpor, Stepanyan, Fomin, Chalenko, Shitov.
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Andreeva, N.A., Zyskin, Y.L., Kalekin, O.R. et al. Observations of the gamma-ray flux from the galaxy Mk 501. Astron. Lett. 26, 199–203 (2000). https://doi.org/10.1134/1.20382
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DOI: https://doi.org/10.1134/1.20382