EDP Sciences
Free access
Volume 366, Number 2, February I 2001
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20000537

A&A 366, L5-L8 (2001)
DOI: 10.1051/0004-6361:20000537

AGN and starbursts at high redshift: High resolution EVN radio observations of the Hubble Deep Field

M. A. Garrett1, T. W. B. Muxlow2, S. T. Garrington2, W. Alef3, A. Alberdi4, H. J. van Langevelde1, T. Venturi5, A. G. Polatidis6, K. I. Kellermann7, W. A. Baan8, A. Kus9, P. N. Wilkinson10 and A. M. S. Richards2

1  Joint Institute for VLBI in Europe (JIVE), Postbus 2, 7990 AA, Dwingeloo, The Netherlands
2  MERLIN/VLBI National Facility, Jodrell Bank Observatory, Lower Withington, Macclesfield, Cheshire SK11 9DL, UK
3  Max-Planck-Institut für Radioastronomie Auf dem Hügel 69, 53121 Bonn, Germany
4  Instituto de Astrofísica de Andalucia, CSIC, Apdo. 3004, 18080 Granada, Spain
5  Instituto di Radioastronomia, CNR, Via P. Gobetti, 101, 40129 Bologna, Italy
6  Onsala Space Observatory, 43992 Onsala, Sweden
7  National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA
8  Netherlands Foundation for Research in Astronomy (ASTRON), Postbus 2, 7990 AA Dwingeloo, The Netherlands
9  Torun Centre for Astronomy, Nicolas Copernicus University ul. Gagarina 11, 87-100 Torun, Poland
10  The University of Manchester, Jodrell Bank Observatory, Lower Withington, Macclesfield, Cheshire SK11 9DL, UK

(Received 10 November 2000 / Accepted 14 December 2000 )

We present deep, wide-field European VLBI Network (EVN) 1.6 GHz observations of the Hubble Deep Field (HDF) region with a resolution of 0.025 arcseconds. Above the 210 $\mu$Jy/beam ($5\sigma$) detection level, the EVN clearly detects two 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=1.013, 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, VLA J123646+621404, is detected at the $4\sigma$ level. The VLBI detections of all three sources suggest that most of the radio emission of these particular sources (including the dusty starburst) is generated by an embedded AGN.

Key words: galaxies: active -- galaxies: radio continuum -- galaxies: starburst

Offprint request: M. A. Garrett, garrett@jive.nl

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© ESO 2001