Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-11
Mon.Not.Roy.Astron.Soc. 347 (2004) L79
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, 1 table, accepted for publication in MNRAS Letters
Scientific paper
10.1111/j.1365-2966.2004.07504.x
We present low-frequency, GMRT (Giant Metrewave Radio Telescope) observations at 333 and 617 MHz of the most-distant giant quasar, J1432+158, which is at a redshift of 1.005. The radio source has a total angular extent of 168 arcsec, corresponding to a projected linear size of 1.35 Mpc. This makes it presently the largest single object observed beyond a redshift of one. The objectives of the GMRT observations were to investigate the possibility of detecting a bridge of emission at low frequencies, which may be suppressed due to inverse-Compton losses against the cosmic microwave background radiation. We detect a jet-like structure connecting the core to the western hotspot, while the eastern hotspot is found to be largely tail-less with no significant bridge emission. The estimated life-time for the radiating electrons in the tail of the western lobe appears smaller than the travel time of the radiating particles from the hotspot, suggesting either in-situ acceleration or dissipation of energy by the jet at this location. The pressure of the intergalactic medium at $z\sim1$ estimated from the minimum energy density calculations appears to be marginally lower than the value extrapolated from nearby giant radio galaxies.
Konar Chiranjib
Saikia D. J.
Singal Ashok K.
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