Naslov
Discovery of Very High Energy Gamma-Ray Emission from NGC1275 by MAGIC

Autori
Aleksić, Jelena ; ... ; Dominis Prester, Dijana ; ... ; Ferenc, Daniel ; ... ; Godinović, Nikola ; ... ; Hrupec, Dario ; ... ; Puljak, Ivica ; ... ; Surić, Tihomir ; ... ; Terzić, Tomislav

Izvornik
The Astronomer's Telegram, #2916

Vrsta, podvrsta
Ostale vrste radova, ostalo

Godina
2010

Ključne riječi
Gamma Ray ; >GeV ; TeV ; VHE ; AGN ; Blazars ; Cosmic Rays

Sažetak
The MAGIC Collaboration reports the detection of Very High Energy (VHE) gamma-ray emission from a position consistent with NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The MAGIC observations were carried out in stereoscopic mode starting from August 2010, accumulating 14 h of good quality data. Preliminary analysis using the standard analysis chain with a energy threshold of 100 GeV, shows an excess of 280 gamma-rays, corresponding to a statistical significance of 5.2 standard deviations. The observed flux is estimated to be ~3% of the Crab nebula flux above 100 GeV, and it decreases rapidly with energy. No signal is detected above 400 GeV. The MAGIC VHE detection happened during a period of increased high gamma-ray activity of NGC 1275, as reported in July 2010 by the Fermi/LAT collaboration, ATel#2737, and continuing until October, according to an analysis of public Fermi/LAT data. MAGIC will continue observations of NGC1275. Observations at other wavelengths are encouraged.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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