Abstract

PKS 2155−304 is one of the brightest BL Lac object in the sky and a very well studied target from radio to TeV bands. We present a study of low frequency radio monitoring on this source during one of its flaring episode in this poster. The high resolution low frequency radio data detected a kpc-scale diffuse jet feature around PKS 2155−304. Further, the analysis of monitoring data at various time scales of the flux evolution at different radio frequencies confirms the variability in this source and supports synchrotron emission mechanism. At lower frequencies enhanced emission from diffuse jet structures dominates the spectra, followed by power−law decay at higher frequencies. Clearly, these results give an interesting insight of the emission mechanisms in blazars. Finally we highlight the importance of contributions from LOFAR and SKA in studying such objects.