High-z radio starbursts host obscured X-ray AGN
A. M. S. Richards, R. J. Beswick, S. T. Garrington, T. W. B. Muxlow, H. Thrall, M. A. Garrett, M. Kettenis, H. J. van Langevelde, E. Gonzalez-Solarez, N. A. Walton, M. G. Allen
Abstract
We use Virtual Observatory methods to investigate the association between radio and X-ray emission at high redshifts. Fifty-five of the 92 HDF(N) sources resolved by combining MERLIN+VLA data were detected by Chandra, of which 18 are hard enough and bright enough to be obscured AGN. The high-z population of microJy radio sources is dominated by starbursts an order of magnitude more active and more extended than any found at z<1 and at least a quarter of these simultaneously host highly X-ray-luminous obscured AGN.
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