Abstract Details
| Name: Prathamesh Tamhane Affiliation: National Center for Radio Astrophysics, Pune. Conference ID: ASI2015_687 Title : Extended diffuse X-ray emission associated with lobes of a high redshift giant radio galaxy Authors and Co-Authors : Yogesh Wadadekar, NCRA-TIFR, Pune, India. Veeresh Singh, University of KwaZulu-Natal, South Africa. Ishwara Chandra, NCRA-TIFR, Pune, India. Aritra Basu, Max-Planck-Institut für Radioastronomie, Germany. Alexandre Beelen, Institut d'Astrophysique Spatiale, France. Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : We investigate the nature of extended, diffuse, X-ray emission associated with the lobes of a giant radio galaxy at redshift z=1.325, in the XMMLSS field using XMM-Newton observations. X-ray emission is nearly co-spatial with the radio lobes and 0.5 - 10 keV spectrum can be best fitted with a power law of index ~ 1.6, consistent with its plausible origin as Inverse Compton scattering of the Cosmic Microwave Background (ICCMB) photons. We estimate the magnetic field in radio lobes using both X-ray and radio observations. We find that the magnetic field estimates assuming ICCMB and equipartition argument are 12.5 $\micro$G and 8.2 $\micro$G, respectively, consistent with each other within the uncertainties. Our estimate of total energy in relativistic particles within the lobes ($6.7 \times 10^{59}$ erg.) implies a significant impact of lobes into the surrounding medium. Notably, radio and X-ray emission from the central AGN remains undetected in present observations inferring AGN to be either in an intrinsically weak phase or heavily absorbed with flat/inverted radio spectrum. Our study of this source will be presented in the context of evolution of radio galaxies. |