2017A&A...598L...1K


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.06CEST07:36:03

2017A&A...598L...1K - Astronomy and Astrophysics, volume 598, L1-1 (2017/2-1)

VLBI-Gaia offsets favor parsec-scale jet direction in active galactic nuclei.

KOVALEV Y.Y., PETROV L. and PLAVIN A.V.

Abstract (from CDS):

Context. The data release 1 (DR1) of milliarcsecond-scale accurate optical positions of stars and galaxies was recently published by the space mission Gaia.
Aims. 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.
Methods. We analyzed VLBI and Gaia positions and determined the direction of jets in 2957 AGNs from their VLBI images.
Results. 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 0 to tens of mas. Offsets in the opposite direction do not exceed 3mas.
Conclusions. 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 1mas can be explained either by a non-point-like VLBI jet structure or a "core-shift" effect due to synchrotron opacity.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: active - galaxies: jets - radio continuum: galaxies - astrometry - reference systems

Status at CDS:  

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0003+380 QSO 00 05 57.17539168 +38 20 15.1489409   19.4 18.10 17.16   ~ 109 1
2 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1835 2
3 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5305 1
4 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6182 3
5 8C 1803+784 BLL 18 00 45.6831135718 +78 28 04.017792333   16.4 16.4 15.46   ~ 657 1

    Equat.    Gal    SGal    Ecl

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2020.06.06-07:36:03

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