2007/09/27 by C. Konar, M. Jamrozy, D. J. Saikia +1 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Cosmic Phenomena #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2007.12519.x
14 pages, 5 figures, 6 tables, one appendix; accepted for publication in MNRAS
arxiv created 2007/09/27 · openalex publication_date 2007/12/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present low-frequency observations with the Giant Metrewave Radio Telescope of a sample of giant radio sources, and high-frequency observations of three of these sources with the Very Large Array. From multifrequency observations of the lobes, we estimate the magnetic field strengths using three different approaches, and show that these differ at most by a factor of ∼3. For these large radio sources, the inverse-Compton losses usually dominate over synchrotron losses when estimates of the classical minimum energy magnetic field are used, consistent with earlier studies. However, this is often not true if the magnetic fields are close to the values estimated using the formalism of Beck & Krause. We also examine the spectral indices of the cores and any evidence of recurrent activity in these sources. We probe the environment using the symmetry parameters of these sources and suggest that their environments are often asymmetric on scales of ∼1 Mpc, consistent with earlier studies.