Query : 2010A&A...521A...2D

2010A&A...521A...2D - Astronomy and Astrophysics, volume 521, A2-2 (2010/10-1)

The dynamical ages of two low-luminosity young radio sources.


Abstract (from CDS):

Young radio-loud active galactic nuclei form an important tool for investigating the evolution of extragalactic radio sources. To study the early phases of expanding radio sources, we are using the CORALZ sample, which contains 25 compact (θ<2'') radio sources associated with nearby galaxies. In this paper we aim to determine the lobe-to-lobe expansion speeds for two sources in the sample. Comparing the dynamical ages of these relatively low-luminosity objects with ages of powerful sources found in the literature, will serve to test radio source evolution models. We present our third epoch of VLBI observations, using the EVN+VLBA array at 5.0GHz, at four and eight years after our previous measurements. We report the detection of a lobe-to-lobe expansion speed of 0.095±0.020h–1c for CORALZ J083139+460800, and a 1-σ upper limit to the expansion speed of CORALZ J131739+411545 of 0.074h–1c. The detected expansion speed of CORALZ J083139+460800 corresponds to a dynamical age of 245±55 years. The detected expansion speed and upper limit are lower than any presented in the literature for powerful young AGN. This confirms that the expansion speeds of young radio sources are correlated with their radio luminosities.

Abstract Copyright:

Journal keyword(s): galaxies: active - radio continuum: galaxies

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 LEDA 2275964 Sy2 08 31 39.8039 +46 08 00.775   18.94 18.07 13.6   ~ 32 0
2 ICRF J092703.0+390220 Sy1 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 984 1
3 ICRF J131739.1+411545 Bla 13 17 39.1954 +41 15 45.621           ~ 43 0
4 4C 57.28 QSO 16 57 20.70895950 +57 05 53.5036669   18.59 18.28 17.4   ~ 72 1

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