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Issue A&A
Volume 420, Number 2, June III 2004
Page(s) 491 - 499
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20035777



A&A 420, 491-499 (2004)
DOI: 10.1051/0004-6361:20035777

3C 129: The GMRT observations

Dharam Vir Lal and A. Pramesh Rao

National Centre for Radio Astrophysics, Pune University campus, Ganeshkhind, Pune 411 007, India
    e-mail: dharam@ncra.tifr.res.in; pramesh@ncra.tifr.res.in

(Received 1 December 2003 / Accepted 8 March 2004 )

Abstract
We present radio maps of the head-tail radio galaxy, 3C 129 at 240 and 610 MHz using the Giant Metrewave Radio Telescope. We have studied in detail the morphology of the source and the distribution of spectral index over the object. We find large-scale spectral steepening along the jet away from the core. Using synchrotron spectral ageing theory, we infer the age (time since particle acceleration) of electrons at various locations along the jet and ascribe an age of ~200 Myr to 3C 129. We find that the "Crosspiece" has a spectral index of ${\sim}$ -1, similar to the jet, which is not consistent with the suggestion by Lane et al. (2002) that it could be a radio relic. We have also studied 3C 129.1 and the other sources in the field.


Key words: galaxies: active -- galaxies: clusters: individual: 3C 129 -- radio continuum: galaxies

Offprint request: Dharam Vir Lal, dharam@ncra.tifr.res.in



© ESO 2004


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