We present new radio observations at frequencies ranging from 240 to 4860 MHz of the well-known , double-double radio galaxy ( DDRG ) , J1453+3308 , using both the Giant Metrewave Radio Telescope ( GMRT ) and the Very Large Array ( VLA ) .
These observations enable us to determine the spectra of the inner and outer lobes over a large frequency range and demonstrate that while the spectrum of the outer lobes exhibits significant curvature , that of the inner lobes appears practically straight .
The break frequency , and hence the inferred synchrotron age of the outer structure , determined from 16 - arcsec strips transverse to the source axis , increases with distance from the heads of the lobes .
The maximum spectral ages for the northern and southern lobes are \sim 47 and 58 Myr respectively .
Because of the difference in the lengths of the lobes these ages imply a mean separation velocity of the heads of the lobes from the emitting plasma of 0.036c for both the northern and southern lobes .
The synchrotron age of the inner double is about 2 Myr which implies an advance velocity of \sim 0.1c , but these values have large uncertainties because the spectrum is practically straight .