  Analysis of Giant Metrewave Radio Telescope low frequency data for an
X-shaped source, 3C 223.1 has revealed an unusual result. The radio
morphologies of it at 240 and 610 MHz show well defined X-shape with a pair of
active jets along the north-south axis and a pair of wings along the east-west
axis, that pass symmetrically through the undetected radio core. The wings (or
low surface brightness jets) have flatter spectral indices with respect to the
high surface brightness jets, which confirms the earlier marginal result
obtained at high frequency by Dennett-Thorpe et al. (2002). Although unusual,
it is a valuable result which puts stringent constraints on the formation
models and nature of these sources. This result clearly shows the value of
mapping the sample of X-shaped sources at low frequencies.

Astrophysics