The low-frequency radio emission in blazar PKS2155–304

M. Pandey-Pommier1*, S. Sirothia2, P. Chadwick3, J. M. Martin4, P. Colom4, F. Combes5, W. vanDriel4, J. Richard1, B. Guiderdoni1 and P.-J. Crespeaus1
1Université de Lyon, Lyon, F−69003; Observatoire de Lyon, 9 avenue Charles André, Saint−Genis Laval,France
2National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Ganeshkhind, Pune 411007, India
3Department of Physics, Durham University, South Road, Durham DH1 3LE, UK 4GEPI-l’Observatoire de Paris, France
5LERMA, Observatoire de Paris, 61 avenue de l’Observatoire, 75014 Paris, France

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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.

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Keywords : Radio continuum:galaxies−galaxies:radio galaxies−jets:variability