Intra-day variability observations of S5 0716+714 over 4.5 years at 4.8 GHz

Abstract

We aim to search for evidence of annual modulation in the time scales of the BL Lac object S5 0716+714. The intra-day variability (IDV) observations were carried out monthly from 2005 to 2009, with the Urumqi 25m radio telescope at 4.8 GHz. The source has shown prominent IDV as well as long-term flux variations. The IDV time scale does show evidence in favor of an annual modulation, suggesting that the IDV of 0716+714 is dominated by interstellar scintillation. The source underwent a strong outburst phase between mid-2008 and mid-2009; a second intense flare was observed in late 2009, but no correlation between the total flux density and the IDV time scale is found, implying that the flaring state of the source does not have serious implications for the general characteristics of its intra-day variability. However, we find that the inner-jet position angle is changing throughout the years, which could result in an annual modulation noise in the anisotropic ISS model fit. There is also an indication that the lowest IDV amplitudes (rms flux density) correspond to the slowest time scales of IDV, which would be consistent with an ISS origin of the IDV of 0716+714.

arXiv comment6 pages, 7 figures, accepted for publication in A&A; corrected typos in Table 2

References in corpus (25)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
• Gamma-ray Light Curves and Variability of Bright Fermi-Detected Blazars
• Optical and radio behaviour of the BL Lacertae object 0716+714
• The discovery of a microarcsecond quasar: J1819+3845
• Detection of the host galaxy of S5 0716+714
• PKS 0405--385: the smallest radio quasar?
• Rapid Variability and Annual Cycles in the Characteristic Time-scale of the Scintillating Source PKS 1257-326
• The Micro-Arcsecond Scintillation-Induced Variability (MASIV) Survey II: The First Four Epochs
• Annual modulation in the scattering of J1819+3845: peculiar plasma velocity and anisotropy
• A Sino-German lambda6 cm polarization survey of the Galactic plane I. Survey strategy and results for the first survey region
• Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71, III. Rapid and correlated flux density variability from radio to sub-mm bands
• Annual modulation in IDV of quasar 0917+624 due to Interstellar Scintillation
• Radio variability properties for radio sources
• Rapid interstellar scintillation of PKS B1257-326: two-station pattern time delays and constraints on scattering and microarcsecond source structure
• Kinematic Study of the Blazar S5 0716+714
• The Origin of Radio Scintillation In the Local Interstellar Medium
• The IDV source J1128+5925, a new candidate for annual modulation?
• Emergence and disappearance of micro-arcsecond structure in the scintillating quasar J1819+3845
• Non-radial motion in the TeV blazar S5 0716+714 The pc-scale kinematics of a BL Lac Object
• A seasonal cycle and an abrupt change in the variability characteristics of the intraday variable source S4 0954+65
• Detection of Six Rapidly Scintillating AGNs and the Diminished Variability of J1819+3845
• Annual Cycles in the Interstellar Scintillation Timescales of PKS B1519-273 and PKS B1622-253
• Very Long Baseline Array observations of the Intraday Variable source J1128+592
• Radio observations of the first three-month Fermi-AGN at 4.8 GHz

Cited by in corpus (18)

• Radio to gamma-ray variability study of blazar S5 0716+714
• Multiwavelength Intraday Variability of the BL Lac S5 0716+714
• Multi-wavelength characterization of the blazar S5~0716+714 during an unprecedented outburst phase
• Multi-wavelength Intra-day Variability and Quasi-periodic Oscillation in Blazars
• Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron. III. Blazar S5 0716+71 at microarcsecond resolution
• Simultaneous optical monitoring of BL Lacertae object S5 0716+714 with high temporal resolution
• East Asian VLBI Network Observations of Active Galactic Nuclei Jets: Imaging with KaVA+Tianma+Nanshan
• Radio and optical intra-day variability observations of five blazars
• Two-year monitoring of intra-day variability of quasar 1156+295 at 4.8 GHz
• Interferometric Monitoring of Gamma-ray Bright AGNs: S5 0716+714
• The presence of interstellar scintillation in the 15 GHz interday variability of 1158 OVRO-monitored blazars
• Spica and the annual cycle of PKS B1322-110 scintillations
• Intra-day variability observations and the VLBI structure analysis of quasar S4 0917+624
• Rapid variability of BL Lac 0925+504: interstellar scintillation induced?
• The jet of S5 0716+71 at $\mu$as scales with RadioAstron
• Interstellar Scintillation of an Extreme Scintillator: PKS B1144-379
• Intra-Day Variability Observations of Two Dozens of Blazars at 4.8 GHz
• 4.8 GHz Intra-Day Variability of FSRQ 0507+179