PG 1553+113: Five Years Of Observations With Magic

J., Aleksić

doi:10.1088/0004-637X/748/1/46

Title: PG 1553+113: Five Years Of Observations With Magic

Journal Article · Mon Mar 05 00:00:00 EST 2012 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/748/1/46· OSTI ID:1356754

J., Aleksić ^[1]

Inst. for High Energy Physics (IFAE), Bellaterra (Spain); et al.

We present the results of five years (2005-2009) of MAGIC observations of the BL Lac object PG 1553+113 at very high energies (VHEs; E > 100 GeV). Power-law fits of the individual years are compatible with a steady mean photon index Γ = 4.27 ± 0.14. In the last three years of data, the flux level above 150 GeV shows a clear variability (probability of constant flux < 0.001%). The flux variations are modest, lying in the range from 4% to 11% of the Crab Nebula flux. Simultaneous optical data also show only modest variability that seems to be correlated with VHE gamma-ray variability. We also performed a temporal analysis of (all available) simultaneous Fermi/Large Area Telescope data of PG 1553+113 above 1 GeV, which reveals hints of variability in the 2008-2009 sample. Finally, we present a combination of the mean spectrum measured at VHEs with archival data available for other wavelengths. The mean spectral energy distribution can be modeled with a one-zone synchrotron self-Compton model, which gives the main physical parameters governing the VHE emission in the blazar jet.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: MAGIC Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356754

Journal Information:: The Astrophysical Journal, Vol. 748, Issue 1; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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