# Observations of the Blazar 3C 66A with the MAGIC Telescopes in Stereoscopic Mode - Astrophysics > High Energy Astrophysical Phenomena

Observations of the Blazar 3C 66A with the MAGIC Telescopes in Stereoscopic Mode - Astrophysics > High Energy Astrophysical Phenomena - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We report new observations of the intermediate-frequency peaked BL Lacertaeobject 3C 66A with the MAGIC telescopes. The data sample we use were taken in2009 December and 2010 January, and comprises 2.3 hr of good quality data instereoscopic mode. In this period, we find a significant signal from thedirection of the blazar 3C 66A. The new MAGIC stereoscopic system is shown toplay an essential role for the separation between 3C 66A and the nearby radiogalaxy 3C 66B, which is at a distance of only $6^\prime$. The derived integralflux above $100\eh{GeV}$ is 8.3% of Crab Nebula flux and the energy spectrum isreproduced by a power law of photon index $3.64 \pm 0.39 { m stat} \pm0.25 { m sys}$. Within errors, this is compatible with the one derived byVERITAS in 2009. From the spectra corrected for absorption by the extragalacticbackground light, we only find small differences between the four models thatwe applied, and constrain the redshift of the blazar to $z < 0.68$.

Autor: The MAGIC Collaboration: J. Aleksić 1, L. A. Antonelli 2, P. Antoranz 3, M. Backes 4, J. A. Barrio 5, D. Bastieri 6, J. Becerra

Fuente: https://arxiv.org/