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Spectral Indices and Particle Ageing Studies on the Giant Radio Galaxy NGC6251

Published online by Cambridge University Press:  25 May 2016

K.-H. Mack ,
U. Klein ,
L. Saripalli ,
A. G. Willis  and
C. P. O'DEA
K.-H. Mack
Affiliation:
1 Radioastronomisches Institut der Universität Bonn - Auf dem Hügel 71, 53121 Bonn, Germany
U. Klein
Affiliation:
1 Radioastronomisches Institut der Universität Bonn - Auf dem Hügel 71, 53121 Bonn, Germany
L. Saripalli
Affiliation:
1 Radioastronomisches Institut der Universität Bonn - Auf dem Hügel 71, 53121 Bonn, Germany
A. G. Willis
Affiliation:
3 Dominion Radio Astrophysical Observatory - P.O. Box 248, Penticton, BC, Canada V2A 6K3
C. P. O'DEA
Affiliation:
4 Space Telescope Science Institute - 3700 San Martin Drive, Baltimore, MD 21218, USA

Extract

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In the framework of our high-frequency survey of giant radio galaxies with the Effelsberg 100-m telescope (Klein et al., 1994; Saripalli et al., 1995) we have obtained radio continuum maps of NGC6251, a source of 1.5 Mpc size (H0 = 75km s –1Mpc –1). Together with low-frequency WSRT observations (Willis & O'Dea, 1990), these measurements form a unique data base which for the first time allows thorough studies of the spectral index over a large frequency range. Theoretical models of particle ageing have been fitted to the spectrum to determine particle ages and other relevant physical parameters. Because of the immense size of NGC6251 these numbers provide information about the physics of the surrounding intergalactic medium.

Type
Radio Sources and their Environment
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 317 - 318
Copyright
Copyright © Kluwer 1996 

References

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