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arXiv: 1010.0550
handle: 2445/122812 , 20.500.14352/43901 , 10261/45377 , 11368/2632296 , 11365/38995 , 11577/2490861 , 11390/884427 , 11568/189017
arXiv: 1010.0550
handle: 2445/122812 , 20.500.14352/43901 , 10261/45377 , 11368/2632296 , 11365/38995 , 11577/2490861 , 11390/884427 , 11568/189017
We report new observations of the intermediate-frequency peaked BL Lacertae object 3C 66A with the MAGIC telescopes. The data sample we use were taken in 2009 December and 2010 January, and comprises 2.3 hr of good quality data in stereoscopic mode. In this period, we find a significant signal from the direction of the blazar 3C 66A. The new MAGIC stereoscopic system is shown to play an essential role for the separation between 3C 66A and the nearby radio galaxy 3C 66B, which is at a distance of only $6^\prime$. The derived integral flux above $100\eh{GeV}$ is 8.3% of Crab Nebula flux and the energy spectrum is reproduced by a power law of photon index $3.64 \pm 0.39_{\rm stat} \pm 0.25_{\rm sys}$. Within errors, this is compatible with the one derived by VERITAS in 2009. From the spectra corrected for absorption by the extragalactic background light, we only find small differences between the four models that we applied, and constrain the redshift of the blazar to $z < 0.68$.
Accepted for publication in ApJ
galaxies [Gamma rays], CHERENKOV TELESCOPE, LAC Objects, Electrónica (Física), 2202.03 Electricidad, BL Lacertae objects: individual (3C 66A), Raigs gamma, Spectra., High Energy Astrophysical Phenomena (astro-ph.HE), TEV BLAZARS, Physics, Gamma-Ray Emission, Cherenkov Telescope, Galaxies: active, Gamma rays: galaxies, BL Lacertae objects, BL LACERTAE OBJECTS, BL LACERTAE OBJECTS; EXTRAGALACTIC BACKGROUND LIGHT; HIGH-ENERGY EMISSION; GAMMA-RAY EMISSION; CHERENKOV TELESCOPE; PROTON BLAZAR; LAC OBJECTS; TEV BLAZARS; X-RAY; SPECTRA, Electrónica, Física nuclear, Electricidad, BL Lacertae objects: individual: 3C 66A, Astrophysics - High Energy Astrophysical Phenomena, TEV Blazars, individual (3C 66A) [BL Lacertae objects], active [Galaxies], 539.1, BL Lacertae objects: individual (3C 66A) — galaxies: active — gamma rays: galaxies, galaxies: active, FOS: Physical sciences, Extragalactic Background Light, High-Energy Emission, 537, Proton Blazar, gamma rays: galaxies, PROTON BLAZAR, SPECTRA, Gamma rays, Astronomy and Astrophysics, 2207 Física Atómica y Nuclear, EXTRAGALACTIC BACKGROUND LIGHT, LAC OBJECTS, Galàxies actives, X-RAY, X-Ray, Active galaxies, HIGH-ENERGY EMISSION, BL Lacertae objects: individual: 3C 66A; galaxies: active; gamma rays: galaxies, GAMMA-RAY EMISSION
galaxies [Gamma rays], CHERENKOV TELESCOPE, LAC Objects, Electrónica (Física), 2202.03 Electricidad, BL Lacertae objects: individual (3C 66A), Raigs gamma, Spectra., High Energy Astrophysical Phenomena (astro-ph.HE), TEV BLAZARS, Physics, Gamma-Ray Emission, Cherenkov Telescope, Galaxies: active, Gamma rays: galaxies, BL Lacertae objects, BL LACERTAE OBJECTS, BL LACERTAE OBJECTS; EXTRAGALACTIC BACKGROUND LIGHT; HIGH-ENERGY EMISSION; GAMMA-RAY EMISSION; CHERENKOV TELESCOPE; PROTON BLAZAR; LAC OBJECTS; TEV BLAZARS; X-RAY; SPECTRA, Electrónica, Física nuclear, Electricidad, BL Lacertae objects: individual: 3C 66A, Astrophysics - High Energy Astrophysical Phenomena, TEV Blazars, individual (3C 66A) [BL Lacertae objects], active [Galaxies], 539.1, BL Lacertae objects: individual (3C 66A) — galaxies: active — gamma rays: galaxies, galaxies: active, FOS: Physical sciences, Extragalactic Background Light, High-Energy Emission, 537, Proton Blazar, gamma rays: galaxies, PROTON BLAZAR, SPECTRA, Gamma rays, Astronomy and Astrophysics, 2207 Física Atómica y Nuclear, EXTRAGALACTIC BACKGROUND LIGHT, LAC OBJECTS, Galàxies actives, X-RAY, X-Ray, Active galaxies, HIGH-ENERGY EMISSION, BL Lacertae objects: individual: 3C 66A; galaxies: active; gamma rays: galaxies, GAMMA-RAY EMISSION
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