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:
-
- 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:
- Accepted Manuscript
- Journal Name:
- The 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. https://doi.org/10.1088/0004-637X/748/1/46
J., Aleksić. Mon .
"PG 1553+113: Five Years Of Observations With Magic". United States. https://doi.org/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 = {The Astrophysical Journal},
number = 1,
volume = 748,
place = {United States},
year = {Mon Mar 05 00:00:00 EST 2012},
month = {Mon Mar 05 00:00:00 EST 2012}
}
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