A new look at old friends. I. Imaging classical radio galaxies with
  uGMRT and MeerKAT
  We have undertaken a systematic study of FRI and FRII radio galaxies with the
upgraded Giant Metrewave Radio Telescope (uGMRT) and MeerKAT. The main goal is
to explore whether the unprecedented few $\mu$Jy sensitivity reached in the
range 550-1712 MHz at the resolution of $\sim4^{\prime\prime}-7^{\prime\prime}$
reveals new features in the radio emission which might need us to revise our
current classification scheme for classical radio galaxies. In this paper we
present the results for the first set of four radio galaxies, i.e. 4C 12.02, 4C
12.03, CGCG 044-046 and CGCG 021-063. The sources have been selected from the
4C sample with well-defined criteria, and have been imaged with the uGMRT in
the range 550-850 MHz (band 4) and with the MeerKAT in the range 856-1712 MHz
(L-band). Full resolution images are presented for all sources in the sample,
together with MeerKAT in-band spectral images. Additionally, the uGMRT-MeerKAT
spectral image and MeerKAT L-band polarisation structure are provided for CGCG
044-046. Our images contain a wealth of morphological details, such as
filamentary structure in the emission from the lobes, radio emission beyond the
hot-spots in three sources, and misalignments. We briefly discuss the overall
properties of CGCG 044-046 in the light of the local environment as well, and
show possible restarted activity in 4C 12.03 which needs to be confirmed. We
conclude that at least for the sources presented here, the classical FRI/FRII
morphological classification still holds with the current improved imaging
capabilities, but the richness in details also suggests caution in the
systematic morphological classification carried out with automatic procedures
in surveys with poorer sensitivity and angular resolution.
