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PG 1553+113: five years of observations with MAGIC
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arxiv 1101.2764 v4 pith:XEH5PTIC submitted 2011-01-14 astro-ph.CO astro-ph.HE
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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 $\pm$ 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/LAT 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 very high energies with archival data available for other wavelengths. The mean spectral energy distribution can be modeled with a one-zone Synchrotron Self Compton (SSC) model, which gives the main physical parameters governing the VHE emission in the blazar jet.
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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 58 citations worldwide. Full citation record
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Tracking down the broadband polarimetric properties of PG 1553+113
astro-ph.HE 2026-05 unverdicted novelty 4.0 of 10
New IXPE X-ray polarimetry and optical monitoring of PG 1553+113 reveal variable polarization and a large EVPA swing, supporting jet models with related but non-co-spatial X-ray and optical emission regions.
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Variability Study of Extreme Blazars with VERITAS
astro-ph.HE 2019-08 conditional novelty 4.0 of 10
For three extreme blazars, VERITAS finds band-to-band correlations partly consistent with one-zone emission, while the TeV opacity analysis cannot rule out secondary gamma-ray production.
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