Abstract
AbstractWe report the detection of H i absorption towards the inner double of the double-double radio galaxy (DDRG) J1247+6723 with the Giant Metrewave Radio Telescope (GMRT). The inner double is a gigahertz peaked spectrum (GPS) source with a linear size of 14 pc while the overall size defined by the outer double is 1195 kpc, making it a giant radio source. The absorption profile is well resolved and consists of a number of components on either side of the optical systemic velocity. The neutral hydrogen column density is estimated to be N(H i) = 6.73 × 1020 (Ts/100)(1.0/fc) cm−2, where Ts and fc are the spin temperature and partial coverage of the background source, respectively. We explore any correlation between the occurrence of H i absorption and rejuvenation of radio activity and suggest that there could be a strong relationship between them.
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