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Luminosity Evolution of Double Radio Sources

Published online by Cambridge University Press:  05 March 2013

Joel C. Carvalho  and
Christopher P. O'Dea
Joel C. Carvalho
Affiliation:
Departamento de Fisica, UFRN, C.P. 1661, CEP 59072-970, Natal, RN, Brazil. [email protected]
Christopher P. O'Dea
Affiliation:
Departamento de Fisica, UFRN, C.P. 1661, CEP 59072-970, Natal, RN, Brazil. [email protected]
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Abstract

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We have recently developed a detailed analytical model for powerful radio sources based on the results of a series of 2-D numerical hydrodynamical simulations. Here we make use of the model results to investigate the radio source luminosity evolution. Changes in the radio spectrum due to radiation losses were calculated in two different scenarios for energy gains/losses: Kardashev–h;Pacholczyk (KP) and ‘continuous injection’ (CI). The magnetic field was calculated in two limiting cases: (1) assuming equipartition of energy between relativistic particles and fields and (2) magnetic flux conservation inside the cocoon. The effect of the surrounding medium was taken into account by considering three different ambient density profiles. The evolutionary tracks were plotted in a power–diameter (P-D) diagram and compared with the predictions of self-similar models. In general, the evolutionary tracks cannot be represented by a simple power law and have a complex form that is most probably the result of the nonself-similar evolution of the source.

Keywords

galaxies: activegalaxies: jetsradio continuum: galaxies
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 98 - 101
Copyright
Copyright © Astronomical Society of Australia 2003

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