Bibcode
Berger, Karsten
Referencia bibliográfica
Proceedings of the 32nd International Cosmic Ray Conference (ICRC2011), held 11-18 August, 2011 in Beijing, China. Vol. 8 OG2.3-2.4: Cosmic Ray Origin and Galactic Phenomena, p.153
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2011
Número de citas
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Número de citas referidas
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Descripción
We present the results of a long M87 monitoring campaign in very high
energy $gamma$-rays with the MAGIC-I Cherenkov telescope. A total of
150 hours of data was gathered between 2005 and 2007. No flaring
activity was found during that time. Nevertheless, we have found an
apparently steady and weak signal at the level of $7sigma$. We present
the spectrum between 100 GeV and 2 TeV, which is consistent with a
simple power law with a spectral index $-2.21pm0.21$ and a flux
normalization (at 300 GeV) of $5.4pm1.1 imes 10^{-8}
frac{1}{mathrm{TeV s m}^{2}}$. It complements well with the previously
published Fermi spectrum, covering an energy range of four orders of
magnitude without apparent change in the spectral index.