Query : 1998A&A...337...69O

1998A&A...337...69O - Astronomy and Astrophysics, volume 337, 69-79 (1998/9-1)

First detection of hotspot advance in a Compact Symmetric Object. Evidence for a class of very young extragalactic radio sources.


Abstract (from CDS):

We present the results of multi-epoch global VLBI observations of the Compact Symmetric Object (CSO), 0710+439 at 5GHz. Analysis of data spread over 13 years shows strong evidence for an increase in the separation of the outer components at a rate of 0.251±0.029h–1c. Dividing the overall size of 86.8h–1pc by this separation rate implies an estimated kinematic age of only 1100±100yrs. After taking into account possible temporal variations in hotspot advance speeds due to cloud collisions or hydrodynamic instabilities we argue that the upper limit to the age of 0710+439 is most likely within a factor of 2 of this estimate and certainly within a factor of 10 (i.e. <11000yrs). This result therefore strongly supports the idea that Compact Symmetric Objects are very young radio-loud sources. Furthermore the large radiative efficiency we calculate for 0710+439 is consistent with strong negative luminosity evolution as CSOs grow in size and with them evolving into classical double sources.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: compact - galaxies: evolution - galaxies: individual: 0710+439

Nomenclature: Table 1, Fig.1: [OC98] 0710+439 AN (Nos A1-A3, B1-B4, C1-C2).

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 - 2022
1 QSO B0710+439 QSO 07 13 38.16412910 +43 49 17.2071530   20.7       ~ 237 0
2 ICRF J202206.6+613658 Sy2 20 22 06.6835988160 +61 36 58.816893852     19.5 17.58   ~ 310 1
3 ICRF J235509.4+495008 BLL 23 55 09.4576071696 +49 50 08.348530416   21.101   18.400   ~ 257 1

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