Low frequency results for the radio galaxies and the role of GMRT
  We have studied several radio galaxies at low radio frequencies using GMRT.
Our prime motivation to detect faint radio emission at very low frequencies due
to low energy electrons.
  Our results provide evidence that there exists two classes of sources on
morphological grounds. The first class is explained by the simple picture of
spectral electron ageing but in the second class the low-frequency synchrotron
emission fades (nearly) as rapidly as high-frequency synchrotron emission. In
addition, in several sources, the spectra of low-surface-brightness features
are flatter than the spectra of high-surface-brightness features, which
suggests that either the simple picture of spectral electron ageing needs
revision or we need to re-examine the formation mechanism of such sources.
  The images and statistics, and the relevance of these results along with the
role of GMRT in exploring several unknowns are presented.
