Diversity of gamma-ray and Radio Variabilities of Bright Blazars and Implications for gamma-ray Emission Location
arXiv:2003.11175 · doi:10.1093/pasj/psaa029
Abstract
Violent multi-wavelength variabilities are observed in gamma-ray-selected blazars. We present an analysis of long-term light curves for eight bright blazars to explore the co-variation pattern in the gamma-ray and radio bands. We extract their gamma-ray light curves and spectra with data observed by the Fermi/LAT since 2008. We find diverse co-variation patterns between the gamma-ray and radio (at 43 GHz) fluxes in these sources. The gamma-ray and radio fluxes of 3C 454.3 and PKS 1633+382 are correlated without any time-lag, suggesting that they are from the same radiation region. Similar correlation is also observed in 3C 273 and PKS 1222+216, but the radio flux is lag behind the gamma-ray flux approximately ~160 days and ~290 days, respectively. This likely suggests that their gamma-ray emission regions are located at the upstream of their radio cores at 43 GHz. The gamma-ray and radio fluxes of the other four blazars are not correlated, implying that the gamma-ray and radio emission may be from different regions in their jets. The gamma-ray light curves of the eight blazars can be decomposed into some long timescale variability components and fast spike flares. We propose that they may be attributed to the central engine activity and the magnetic reconnection process or turbulence in the local emission region, respectively.
34 pages, 11 figures, 2 tables, accepted for publication in PASJ
References in corpus (22)
- The Internal-Collision-Induced Magnetic Reconnection and Turbulence (ICMART) Model of Gamma-Ray Bursts
- Fast TeV variability in blazars: jets in a jet
- Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
- MAGIC discovery of VHE Emission from the FSRQ PKS 1222+21
- A Comprehensive Analysis of the Swift/XRT Data: II. Diverse Physical Origins of the Shallow Decay Segment
- GeV breaks in blazars as a result of gamma-ray absorption within the broad-line region
- A method for the estimation of the significance of cross-correlations in unevenly sampled red-noise time series
- Radio/gamma-ray time delay in the parsec-scale cores of active galactic nuclei
- Constraining the Location of Gamma-Ray Flares in Luminous Blazars
- Radio observations of active galactic nuclei with mm-VLBI
- Constraints on minimum electron Lorentz factor and matter content of jets for a sample of bright Fermi blazars
- Intrinsic absorption in 3C 279 at GeV-TeV energies and consequences for estimates of the EBL
- Intrinsic Correlations for Flaring Blazars Detected by Fermi
- Jet outflow and gamma-ray emission correlations in S5 0716+714
- Connection between inner jet kinematics and broadband flux variability in the BL Lac object S5 0716+714
- Long term study of the light curve of PKS 1510-089 in GeV energies
- Universal Behavior of X-ray Flares from Black Hole Systems
- Brightest Fermi-LAT Flares of PKS 1222+216: Implications on Emission and Acceleration Processes
- Exploring the Variability of the Flat Spectrum Radio Source 1633+382. I. Phenomenology of the Light Curves
- Jet Kinematics of the Quasar 4C +21.35 from Observations with the KaVA Very Long Baseline Interferometry Array
- Constraints on the location of the gamma-ray emission region for the gamma-ray-loud radio source GB 1310+487
- Multiwavelength flaring activity of PKS1510-089
Cited by in corpus (4)
- An optical overview of blazars with LAMOST I: Hunting changing-look blazars and new redshift estimates
- Jet Properties of Compact Steep-Spectrum Sources and an Eddington-Ratio-Driven Unification Scheme of Jet Radiation in Active Galactic Nuclei
- Multiwavelength analysis and the difference in the behavior of the spectral features during the 2010 and 2014 flaring periods of the blazar 3C 454.3
- Fast Optical Variability of the TeV Blazar PKS 1725+123 Observed by SVOM-VT and Insights from Multi-wavelength Follow-up Observations