C.D.S. - SIMBAD4 rel 1.7 - 2020.07.06CEST22:05:52

2016A&A...588L...9B - Astronomy and Astrophysics, volume 588, L9-9 (2016/4-1)

First 3 mm-VLBI imaging of the two-sided jet in Cygnus A.


Abstract (from CDS):

Aims. We present for the first time Very Long Baseline Interferometry images of the radio galaxy Cygnus A at the frequency of 86GHz. Thanks to the high spatial resolution of only ∼200 Schwarzschild radii (RS), such observations provide an extremely detailed view of the nuclear regions in this archetypal object and allow us to derive important constraints for theoretical models describing the launching of relativistic jets.
Methods. A pixel-based analysis of the jet outflow, which still appears two-sided on the scales probed, was performed. By fitting Gaussian functions to the transverse intensity profiles, we could determine the jet width in the nuclear region.
Results. The base of the jets appears wide. The minimum measured transverse width of ~(227±98)RS is significantly larger than the radius of the innermost stable circular orbit, suggesting that the outer accretion disk is contributing to the jet launching. The existence of a faster and Doppler de-boosted inner section, powered either from the rotation of the inner regions of the accretion disk or by the spinning black hole, is suggested by the kinematic properties and by the observed limb brightening of the flow.

Abstract Copyright: © ESO, 2016

Journal keyword(s): instrumentation: high angular resolution - galaxies: active - galaxies: jets

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6208 3
2 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2112 2
3 QSO J2015+371 BLL 20 15 28.72976962 +37 10 59.5148505     21.82 21.4   ~ 243 2

    Equat.    Gal    SGal    Ecl

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