Radio observations of a few giant sources

Details Radio observations of a few giant sources Radio observations of a few giant sources

2004-08-28

arxiv.org/abs/astro-ph/0408534v1

Astronomy and Astrophysics

Astrophysics

11 pages, 2 figures (Figure 1 shows the images of 17 sources), 4 tables. accepted for publication in Monthly Notices

Scientific paper

10.1111/j.1365-2966.2004.08362.x

We present multifrequency observations with the Giant Metrewave Radio Telescope (GMRT) and the Very Large Array (VLA) of a sample of seventeen largely giant radio sources (GRSs). These observations have either helped clarify the radio structures or provided new information at a different frequency. The broad line radio galaxy, J0313+413, has an asymmetric, curved radio jet and a variable radio core, consistent with a moderate angle of inclination to the line of sight. We attempt to identify steep spectrum radio cores (SSCs), which may be a sign of recurrent activity, and find four candidates. If confirmed, this would indicate a trend for SSCs to occur preferentially in GRSs. From the structure and integrated spectra of the sources we suggest that the lobes of emission in J0139+399 and J0200+408 may be due to an earlier cycle of nuclear activity. We find that inverse-Compton losses with the cosmic microwave background radiation dominate over synchrotron radiative losses in the lobes of all the sources, consistent with earlier studies. We also show that prominence of the bridge emission decreases with increasing redshift, possibly due to inverse-Compton losses. This could affect the appearance and identification of GRSs at large redshifts.

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