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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 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.

Authors:
 [1]
  1. Inst. for High Energy Physics (IFAE), Bellaterra (Spain); et al.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
MAGIC Collaboration
OSTI Identifier:
1356754
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 748; Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

J., Aleksić. PG 1553+113: Five Years Of Observations With Magic. United States: N. p., 2012. Web. doi:10.1088/0004-637X/748/1/46.
J., Aleksić. PG 1553+113: Five Years Of Observations With Magic. United States. doi:10.1088/0004-637X/748/1/46.
J., Aleksić. Mon . "PG 1553+113: Five Years Of Observations With Magic". United States. doi:10.1088/0004-637X/748/1/46. https://www.osti.gov/servlets/purl/1356754.
@article{osti_1356754,
title = {PG 1553+113: Five Years Of Observations With Magic},
author = {J., Aleksić},
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 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.},
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}
}

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Cited by: 28 works
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    Works referencing / citing this record:

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