%0 Journal Article
%T AGN and starbursts at high redshift: High resolution EVN radio observations of the Hubble Deep Field
%A M. A. Garrett
%A T. W. B. Muxlow
%A S. T. Garrington
%J Physics
%D 2001
%I arXiv
%R 10.1051/0004-6361:20000537
%X VLBI now has the capability of imaging relatively large fields-of-view (~ 5 arcmin sq) with sub-mJy detection limits. In principle such observations can distinguish between starburst and AGN activity in cosmologically distant sources. We present the first deep, wide-field European VLBI Network (EVN) 1.6 GHz observations of faint radio sources in the Hubble Deep Field (HDF) region. The EVN clearly (> 5sigma) detects 2 radio sources in a field that encompasses the HDF and part of the Hubble Flanking Fields (HFF). The sources detected are: VLA J123644+621133 (a z=1.01, low-luminosity FR-I radio source located within the HDF itself) and VLA J123642+621331 (a dust enshrouded, optically faint, z=4.424 starburst system). A third radio source, J123646+621404, is detected at the 4sigma level. The observations presented here, suggest that the radio emission in the dusty starburst, VLA J123642+621331, arises mainly from AGN activity, suggesting that in this system, both AGN and starburst activity co-exist. The prospects for future VLBI deep fields are briefly discussed.
%U http://arxiv.org/abs/astro-ph/0102037v1