VLBI-Gaia offsets favor parsec-scale jet direction in Active Galactic Nuclei

Abstract

The data release 1 (DR1) of milliarcsecond-scale accurate optical positions of stars and galaxies was recently published by the space mission Gaia. We study the offsets of highly accurate absolute radio (very long baseline interferometry, VLBI) and optical positions of active galactic nuclei (AGN) to see whether or not a signature of wavelength-dependent parsec-scale structure can be seen. We analyzed VLBI and Gaia positions and determined the direction of jets in 2957 AGNs from their VLBI images. We find that there is a statistically significant excess of sources with VLBI-to-Gaia position offset in directions along and opposite to the jet. Offsets along the jet vary from zero to tens of mas. Offsets in the opposite direction do not exceed 3 mas. The presense of strong, extended parsec-scale optical jet structures in many AGNs is required to explain all observed VLBI-Gaia offsets along the jet direction. The offsets in the opposite direction shorter than 1 mas can be explained either by a non-point-like VLBI jet structure or a "core-shift" effect due to synchrotron opacity.

4 pages, 4 figures; accepted by A&A Letters; minor language corrections to the text are introduced

References in corpus (13)

• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
• The VLBA Imaging and Polarimetry Survey at 5 GHz
• Opacity in compact extragalactic radio sources and its effect on astrophysical and astrometric studies
• The Sixth VLBA Calibrator Survey: VCS6
• The Fifth VLBA Calibrator Survey: VCS5
• Gaia Data Release 1: The reference frame and the optical properties of ICRF sources
• Superluminal non-ballistic jet swing in the quasar NRAO 150 revealed by mm-VLBI
• New Associations of Gamma-Ray Sources from the Fermi Second Source Catalog
• Detecting the Elusive Blazar Counter-Jets
• Absolute kinematics of radio-source components in the complete S5 polar cap sample. IV. Proper motions of the radio cores over a decade and spectral properties
• VLBA Calibrator Survey 9 (VCS-9)

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