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Title: PG 1553+113: FIVE YEARS OF OBSERVATIONS WITH MAGIC

Journal Article · · Astrophysical Journal
;  [1]; ; ;  [2]; ;  [3];  [4];  [5];  [6]; ;  [7];  [8];  [9];  [10]; ; ;  [11]; ;
  1. IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra (Spain)
  2. Groupo de Fisica Atlas Energias, Universidad Complutense, E-28040 Madrid (Spain)
  3. INAF National Institute for Astrophysics, I-00136 Rome (Italy)
  4. Dipartimento di Fisica, Universita di Siena and INFN Pisa, I-53100 Siena (Italy)
  5. Fakultat fuer Physik, Technische Universitaet Dortmund, D-44221 Dortmund (Germany)
  6. Dipartimento di Fisica, Universita di Padova and INFN, I-35131 Padova (Italy)
  7. Inst. de Astrofisica de Canarias, E-38200 La Laguna, Tenerife (Spain)
  8. Department of Astrophysics, University of Lodz, PL-90236 Lodz (Poland)
  9. Tuorla Observatory, University of Turku, FI-21500 Piikkioe (Finland)
  10. Deutsches Elektronen-Synchrotron (DESY), D-15738 Zeuthen (Germany)
  11. ETH Zurich, CH-8093, Wolfgang-Pauli-Str. 15, CH-8093 Zuerich-Hoenggberg (Switzerland)
+ Show Author Affiliations

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 {Gamma} = 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.

OSTI ID:
22016159
Journal Information:
Astrophysical Journal, Vol. 748, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
Country of Publication:
United States
Language:
English

Cited By (21)

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Long-term optical monitoring of TeV emitting blazars: I. Data analysis⋆ journal December 2018
FIRST-EPOCH VLBA IMAGING OF 20 NEW TeV BLAZARS journal November 2014
THE EXTRAGALACTIC BACKGROUND LIGHT, THE HUBBLE CONSTANT, AND ANOMALIES: CONCLUSIONS FROM 20 YEARS OF TeV GAMMA-RAY OBSERVATIONS journal October 2015
Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events? journal July 2014
Discovery of very high energy γ-ray emission from the blazar 1ES 0033+595 by the MAGIC telescopes journal November 2014
Photohadronic origin of $\boldsymbol {\gamma }$-ray BL Lac emission: implications for IceCube neutrinos journal March 2015
Probing the very high energy γ-ray spectral curvature in the blazar PG 1553+113 with the MAGIC telescopes journal May 2015
MAGIC detection of short-term variability of the high-peaked BL Lac object 1ES 0806+524 journal May 2015
Relativistic Magnetic Reconnection in Electron–Positron–Proton Plasmas: Implications for Jets of Active Galactic Nuclei journal July 2019
MAGIC detection of short-term variability of the high-peaked BL Lac object 1ES 0806+524 text January 2015
Gamma-ray blazar spectra with H.E.S.S. II mono analysis: the case of PKS 2155-304 and PG 1553+113 text January 2016
Gamma-ray blazar spectra with H.E.S.S. II mono analysis: The case of PKS 2155−304 and PG 1553+113 journal April 2017
Probing the very high energy $\gamma$-ray spectral curvature in the blazar PG 1553+113 with the MAGIC telescopes text January 2015
Discovery of very high energy γ-ray emission from the blazar 1ES 0033+595 by the MAGIC telescopes text January 2015
Probing the very high energy γ-ray spectral curvature in the blazar PG 1553+113 with the MAGIC telescopes text January 2015
Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events? text January 2014
Spectroscopy of BL Lac objects of extraordinary luminosity text January 2014
The extragalactic background light, the Hubble constant, and anomalies: conclusions from 20 years of TeV gamma-ray observations text January 2015
MAGIC detection of short-term variability of the high-peaked BL Lac object 1ES 0806+524 text January 2015
Relativistic Magnetic Reconnection in Electron-Positron-Proton Plasmas: Implications for Jets of Active Galactic Nuclei text January 2019

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Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BL LACERTAE OBJECTS
CRAB NEBULA
ENERGY SPECTRA
GALAXIES
GAMMA RADIATION
PHOTON EMISSION
PHOTONS
PROBABILITY
TELESCOPES