High-z radio starbursts host obscured X-ray AGN

Details High-z radio starbursts host obscured X-ray AGN High-z radio starbursts host obscured X-ray AGN

2006-12-04

arxiv.org/abs/astro-ph/0612078v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, To appear in the proceedings of 'At the Edge of the Universe' (9-13 October 2006, Sintra, Portugal)

Scientific paper

10.1017/S1743921306010490

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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