Radio Observations of the Hubble Deep Field South - a New Class of Radio-Luminous Galaxies?

R. P. Norris; A. Hopkins; R. J. Sault; R. D. Ekers; J. Ekers; F. Badia; J. Higdon; M. H. Wieringa; B. J. Boyle; R. E. Williams

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Radio Observations of the Hubble Deep Field South - a New Class of Radio-Luminous Galaxies?

R. P. Norris·A. Hopkins·R. J. Sault·R. D. Ekers·J. Ekers·F. Badia·J. Higdon·M. H. Wieringa·B. J. Boyle·R. E. Williams

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Abstract

We present the first results from a series of radio observations of the Hubble Deep Field South and its flanking fields. Here we consider only those sources greater than 100 microJy at 20 cm, in an 8-arcmin square field that covers the WFPC field, the STIS and NICMOS field, and most of the HST flanking fields and complementary ground-based observations. We have detected 13 such radio sources, two of which are in the WFPC2 field itself. One of the sources in the WFPC field (source c) corresponds to a very faint galaxy, and several others outside the WFPC field can not be identified with sources in the other optical/IR wavebands. The radio and optical luminosities of these galaxies are inconsistent with either conventional starburst galaxies or with radio-loud galaxies. Instead, it appears that it belongs to a population of galaxies which are rare in the local Universe, possibly consisting of a radio-luminous active nucleus embedded in a very dusty starburst galaxy, and which are characterised by a very high radio/optical luminosity ratio.

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R. P. Norris, A. Hopkins, R. J. Sault, R. D. Ekers, J. Ekers, F. Badia, J. Higdon, M. H. Wieringa, B. J. Boyle, R. E. Williams. 1999-10-26. Radio Observations of the Hubble Deep Field South - a New Class of Radio-Luminous Galaxies?. https://arxiv.org/abs/astro-ph/9910437

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