High-frequency very long baseline interferometry studies of NRAO 530

Abstract

NRAO 530 is an optically violent variable source and has been studied with multi-epoch multi-frequency high-resolution VLBI observations. NRAO 530 was monitored with the VLBA at three frequencies (22, 43 and 86 GHz) on 10 consecutive days in 2007 May during observations of the Galactic Center (Sgr A*). Furthermore, analysis of archival data of NRAO 530 at 15 GHz over the last ten years allows us to study its detailed jet kinematics. We identified the compact component located at the southern-end of the jet as the VLBI core, consistent with previous studies. The 10-d monitoring data at the 3 high frequencies were shown to produce high quality and self-consistent measurements of the component positions, from which we detected for the first time a two-dimensional frequency-dependent position shift. In addition, the repeated measurements also permit us to investigate the interday flux density and structure variability of NRAO 530. We find that it is more variable for the inner jet components than those further out. We obtained apparent velocities for eight jet components with ${\beta }_{\mathrm{app}}rangingfrom2to26c.Accordingly,weestimatedphysicaljetparameterswiththeminimumLorentzfactorof14andDopplerfactorsintherangeof14--28(componentf).ThechangesinthemorphologyofNRAO530wererelatedtothemotionofseparatejetcomponentswiththemostpronouncedchangesoccurringintheregionsclosetothecore.ForNRAO530,weestimatedaP.A.swingof$3^{\circ}.4$ per year for the entire inner jet (components d and e). The non-ballistic motion and change of jet orientation makes this source another prominent example of a helical and possibly `swinging' jet.

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References in corpus (15)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Bright AGN Source List from the First Three Months of the Fermi Large Area Telescope All-Sky Survey
• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
• Opacity in compact extragalactic radio sources and its effect on astrophysical and astrometric studies
• 3D Relativistic Magnetohydrodynamic Simulations of Current-Driven Instability. I. Instability of a static column
• Superluminal non-ballistic jet swing in the quasar NRAO 150 revealed by mm-VLBI
• Aligning VLBI Images of Active Galactic Nuclei at Different Frequencies
• The role of Kelvin-Helmholtz instability in the internal structure of relativistic outflows. The case of the jet in 3C 273
• The kinematics in the pc-scale jets of AGN The case of S5 1803+784
• Multiwavelength VLBI observations of Sagittarius A*
• A kinematic study of the compact jet in quasar B3 1633+382
• Multi-Frequency VLBI Observations of NRAO 530
• Multi-epoch VLBA observations of 3C 66A
• Physical properties of blazar jets from VLBI observations
• Linear Polarization as a Probe of Gamma Ray Flaring Blazar Jets

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