Multi-band Variability of the TeV Blazar PG 1553+113 with XMM-Newton

Abstract

We present variability analyses of twenty pointed XMM-Newton observations of the high energy peaked TeV blazar PG 1553+113 taken during 2010 to 2018. We found intraday variability in the total X-ray energy range (0.3 -- 10 keV) in 16 out of 19 light curves or a duty cycle of ~84%. A discrete correlation function analysis of the intraday light curves in the soft and hard X-ray bands peaks on zero lag, showing that the emission in hard and soft bands are co-spatial and emitted from the same population of leptons. Red-noise dominates the power spectral density (PSD) of all the LCs although the PSDs have a range of spectral slopes from -2.36 to -0.14. On longer timescales, the optical and UV variability patterns look almost identical and well correlated, as are the soft and hard X-ray bands, but the optical/UV variations are not correlated to those in the X-ray band, indicating that the optical/UV and X-ray emissions are emitted by two different populations of leptons. We briefly discuss physical mechanisms which may be capable of explaining the observed flux and spectral variability of PG 1553+113 on these diverse timescales.

11 pages, 4 tables, 7 figures, The redshift of the blazar has been updated, leading to minor changes in certain quantities but no changes to conclusions. Complete Fig. 1-3 will be published as supplementary material and can be provided on request

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Cited by in corpus (11)

• Periodic Gamma-ray Modulation of the blazar PG 1553+113 Confirmed by Fermi-LAT and Multi-wavelength Observations
• Constraining the PG 1553+113 binary hypothesis: interpreting hints of a new, 22-year period
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• X-ray intraday variability of the TeV blazar Mrk 421 with {\it XMM-Newton}
• X-ray Intraday Variability and Power Spectral Density Profiles of the Blazar 3C 273 with XMM-Newton during 2000-2021
• The variability patterns of the TeV blazar PG 1553+113 from a decade of MAGIC and multi-band observations
• X-ray Studies of Blazar 1ES 1959+650 Using SWIFT & XMM-NEWTON Satellite
• Multi-band Optical Variability of the TeV Blazar PG 1553+113 in 2019
• X-ray Flux and Spectral Variability of the Blazar OJ 287 with Suzaku
• Improving blazar redshift constraints with the edge of the Ly$\alpha$ forest: 1ES 1553+113 and implications for observations of the WHIM
• Testing X-ray Periodicity and Long-Term Trend in PG 1553+113 via Targeted Swift-XRT Monitoring