| Autor: |
Andreeva, N. A., Zyskin, Yu. L., Kalekin, O. R., Neshpor, Yu. I., Stepanyan, A. A., Fomin, V. P., Chalenko, N. N., Shitov, V. G. |
| Předmět: |
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| Zdroj: |
Astronomy Letters; Apr2000, Vol. 26 Issue 4, p199, 5p |
| Abstrakt: |
We present two-year-long observations of the flux of very-high-energy (∼10[sup 12] 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 >10[sup 12] eV, as inferred from the 1997 and 1998 data, is (5.0 ± 0.6) × 10[sup -11] and (3.7 ± 0.6) ™ 10[sup -11] cm[sup -2] s[sup -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 ™ 10[sup 43] erg s[sup -1] sr[sup -1]. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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