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Detection of Very-High Energy Gamma-Rays from the BL Lac Object PG 1553+113 with the MAGIC Telescope

2007-11-10
Robert Wagner (1), Daniela Dorner (2), Masaaki Hayashida (1), Thomas Hengstebeck (3), Daniel Kranich (4), Daniel Mazin (1), Diego Tescaro (5), for the MAGIC Collaboration, Nina Nowak (6) ((1) MPI für Physik, München, Germany, (2) Universität Würzburg, Germany, (3) Humboldt-Universität zu Berlin, Germany, (4) ETH Zurich, Switzerland, (5) IFAE, Barcelona, Spain, (6) MPI für extraterrestrische Physik, Garching, Germany)

Abstract

The MAGIC telescope has observed very-high energy gamma-ray emission from the BL Lac object PG 1553+113 in 2005 and 2006 at an overall significance is 8.8 sigma. The light curve shows no significant flux variations on a daily timescale. The flux level during 2005 was, however, significantly higher as compared to 2006. The differential energy spectrum between approx. 90 GeV and 500 GeV is well described by a power law with a spectral index of -4.2+-0.3. The photon energy spectrum and spectral modeling allow to pose upper limits of z=0.74 and z=0.56, respectively, on the yet undetermined redshift of PG 1553+113. Recent VLT observations of this blazar show featureless spectra in the near-IR, thus no direct redshift could be determined from these measurements.

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URL

https://arxiv.org/abs/0711.1586

PDF

https://arxiv.org/pdf/0711.1586


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