3C 129: The GMRT observations

Abstract

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 ∼−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.

Giant Metrewave Radio Telescope Observations of Head–Tail Radio Galaxies

“…(vi) The equipartition magnetic field and also the pressure in the farther end of the tail is lower by ∼4 as compared to the region close to the core, which is similar to the result for 3C 129 (Lal & Rao 2004).…”

“…Similar complexities are also seen in IC 310, NGC 7385, NGC 1265 and GB6 B0335+0955. Such spectral index jumps were noted earlier by Wilson & Vallee (1977) as well, and this suggests reacceleration of electron population (Jaffe & Perola 1973;Lal & Rao 2004) in these regions due to shocks or turbulence in the cluster environment. It is interesting to note the presence of IC 708, another massive head−tail radio galaxy close to this region showing a jump in spectral index.…”

THESPITZERVIEW OF FR I RADIO GALAXIES: ON THE ORIGIN OF THE NUCLEAR MID-INFRARED CONTINUUM

“…For the variable 5 GHz core flux, we here give the average of all measurements available from NED. Giovannini et al 1988;(13) Giovannini et al 2005; (14) Hardcastle et al 1996;(15) Hines et al 1989;(16) Jones et al 1986; (17) Kollatschny et al 2006;(18) Laing & Bridle 1987;(19) Laing et al 2008;(20) Lawrence et al 1996; (21) Leahy & Perley 1991;(22) Leahy et al 1997;(23) Miley & Osterbrock 1979;(24) Morganti et al 1993;(25) Morganti et al 1999;(26) Taylor et al 2006;(27) O'Dea & Owen 1986;(28) Owen et al 1996;(29) Pedlar et al 1990;(30) Perley et al 1984;(31) Simpson et al 1996;(32) Strom et al 1978;(33) Tadhunter et al 1993;(34) Tadhunter et al 2005;(35) Taylor et al 1990;(36) Taylor et al 2001;(37) Vallee 1982;(38) van Breugel & Jägers 1982;(39) Walker et al 1987;(40) Wills et al 2004;(41) see http://www.jb.man.ac.uk/atlas/; (42) Kellermann et al (1969), on Baars et al (1977) scale using Laing & Peacock (1980); (43) taken from http://3crr.extragalactic.info/; (44) estimated using GMRT measurements (Lal & Rao 2004); (45) Kuehr et al 1981;(46) estimated using the 160 MHz flux (Kuehr et al 1981) and α = −0.8; (47) estimated from low-frequency measurements in NED; (48) …”

Clusters of Galaxies and the Cosmic Web with Square Kilometre Array

“…Recently, a radio study was conducted, using GMRT for a sample of head-tail radio sources, concentrating on 3C129, NGC 1265 and IC 310 (Lal, 2009;Lal & Rao, 2004). New X-ray observations were proposed Figure 6: Low frequency, full synthesis GMRT image of head-tail sources in Perseus cluster at 240 MHz.…”