Long Wavelength Spectral Studies Of Giant Radio Galaxies.

Details Long Wavelength Spectral Studies Of Giant Radio Galaxies. Long Wavelength Spectral Studies Of Giant Radio Galaxies.

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..10o&link_type=abstract

Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #10

Astronomy and Astrophysics

Astrophysics

Scientific paper

Giant radio sources (GRS) are objects with a projected linear size larger than 1 Mpc (H[0] = 50 km s^-1 Mpc^-1, q[0] = 0.5). In agreement with the spectral ageing results reached by Schoenmakers et al. (2000) and Lara et al. (2001) it must be possible to interpret those objects as old sources which have evolved in a low-density ambient medium. It is important to extend spectral ageing studies of these sources at long wavelength; radiative losses are negligible in the low-energy part of the spectrum allowing us to reproduce the zero-age electron spectrum injected and then to improve the estimate of the synchrotron age of the source. Moreover brightness variations are indicative of adiabatic losses and/or large-scale magnetic field gradients. Given their large angular extension (> 10') and steep synchrotron spectra, giant radio galaxies are among the best targets for low-frequency observations. Only in the last few years, the great improvement made in the development of new technologies for low-frequency observations allows to detect the low-brightness structures in the lobes of the GRS. We present new Very Large Array images at 74 and 327 MHz of two giant radio sources 3C35 and 3C223. The radio spectrum of these sources will be investigated between four frequencies 74, 327, 608 and 1400 MHz. Results will be analyzed, discussed and compared with the current models.

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