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

Abstract

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.

Authors:
;  [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)
Publication Date:
OSTI Identifier:
22016159
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 748; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BL LACERTAE OBJECTS; CRAB NEBULA; ENERGY SPECTRA; GALAXIES; GAMMA RADIATION; PHOTON EMISSION; PHOTONS; PROBABILITY; TELESCOPES

Citation Formats

Aleksic, J, Blanch, O, Alvarez, E A, Asensio, M, Barrio, J A, Antonelli, L A, Bonnoli, G, Antoranz, P, Backes, M, Bastieri, D, Gonzalez, J Becerra, Berger, K, Bednarek, W, Berdyugin, A, Bernardini, E, Biland, A, Boller, A, Braun, I, Bock, R K, Tridon, D. Borla, E-mail: fabrizio.tavecchio@brera.inaf.it, E-mail: elisa.prandini@pd.infn.it, and others, and. PG 1553+113: FIVE YEARS OF OBSERVATIONS WITH MAGIC. United States: N. p., 2012. Web. doi:10.1088/0004-637X/748/1/46.
Aleksic, J, Blanch, O, Alvarez, E A, Asensio, M, Barrio, J A, Antonelli, L A, Bonnoli, G, Antoranz, P, Backes, M, Bastieri, D, Gonzalez, J Becerra, Berger, K, Bednarek, W, Berdyugin, A, Bernardini, E, Biland, A, Boller, A, Braun, I, Bock, R K, Tridon, D. Borla, E-mail: fabrizio.tavecchio@brera.inaf.it, E-mail: elisa.prandini@pd.infn.it, & others, and. PG 1553+113: FIVE YEARS OF OBSERVATIONS WITH MAGIC. United States. doi:10.1088/0004-637X/748/1/46.
Aleksic, J, Blanch, O, Alvarez, E A, Asensio, M, Barrio, J A, Antonelli, L A, Bonnoli, G, Antoranz, P, Backes, M, Bastieri, D, Gonzalez, J Becerra, Berger, K, Bednarek, W, Berdyugin, A, Bernardini, E, Biland, A, Boller, A, Braun, I, Bock, R K, Tridon, D. Borla, E-mail: fabrizio.tavecchio@brera.inaf.it, E-mail: elisa.prandini@pd.infn.it, and others, and. Tue . "PG 1553+113: FIVE YEARS OF OBSERVATIONS WITH MAGIC". United States. doi:10.1088/0004-637X/748/1/46.
@article{osti_22016159,
title = {PG 1553+113: FIVE YEARS OF OBSERVATIONS WITH MAGIC},
author = {Aleksic, J and Blanch, O and Alvarez, E A and Asensio, M and Barrio, J A and Antonelli, L A and Bonnoli, G and Antoranz, P and Backes, M and Bastieri, D and Gonzalez, J Becerra and Berger, K and Bednarek, W and Berdyugin, A and Bernardini, E and Biland, A and Boller, A and Braun, I and Bock, R K and Tridon, D. Borla, E-mail: fabrizio.tavecchio@brera.inaf.it, E-mail: elisa.prandini@pd.infn.it and others, and},
abstractNote = {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.},
doi = {10.1088/0004-637X/748/1/46},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 748,
place = {United States},
year = {2012},
month = {3}
}

Works referencing / citing this record:

Spectroscopy of BL Lacertae objects of extraordinary luminosity
journal, October 2014


Long-term optical monitoring of TeV emitting blazars: I. Data analysis⋆
journal, December 2018


Discovery of very high energy γ-ray emission from the blazar 1ES 0033+595 by the MAGIC telescopes
journal, November 2014

  • Aleksić, J.; Ansoldi, S.; Antonelli, L. A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 446, Issue 1
  • DOI: 10.1093/mnras/stu2024

Probing the very high energy γ-ray spectral curvature in the blazar PG 1553+113 with the MAGIC telescopes
journal, May 2015

  • Aleksić, J.; Ansoldi, S.; Antonelli, L. A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 450, Issue 4
  • DOI: 10.1093/mnras/stv811

Spectroscopy of BL Lacertae objects of extraordinary luminosity
journal, October 2014


Long-term optical monitoring of TeV emitting blazars: I. Data analysis⋆
journal, December 2018


Discovery of very high energy γ-ray emission from the blazar 1ES 0033+595 by the MAGIC telescopes
journal, November 2014

  • Aleksić, J.; Ansoldi, S.; Antonelli, L. A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 446, Issue 1
  • DOI: 10.1093/mnras/stu2024

Probing the very high energy γ-ray spectral curvature in the blazar PG 1553+113 with the MAGIC telescopes
journal, May 2015

  • Aleksić, J.; Ansoldi, S.; Antonelli, L. A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 450, Issue 4
  • DOI: 10.1093/mnras/stv811