EDP Sciences
Free access
Volume 394, Number 1, October IV 2002
Page(s) 59 - 69
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20021115

A&A 394, 59-69 (2002)
DOI: 10.1051/0004-6361:20021115

A sample of ultra steep spectrum sources selected from the Westerbork In the Southern Hemisphere (WISH) survey

C. De Breuck1, Y. Tang2, A. G. de Bruyn2, 3, H. Röttgering4 and W. van Breugel5

1  Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France
    e-mail: debreuck@iap.fr
2  ASTRON, Postbus 2, 7990 AA Dwingeloo, The Netherlands
    e-mail: tang,ger@nfra.nl
3  Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
4  Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
    e-mail: rottgeri@strw.leidenuniv.nl
5  IGPP/LLNL, L-413, 7000 East Ave, Livermore, CA 94550, USA
    e-mail: wil@igpp.ucllnl.org

(Received 25 June 2002 / Accepted 1 August 2002 )

The 352 MHz Westerbork In the Southern Hemisphere (WISH) survey is the southern extension of the WENSS, covering 1.60 sr between $-9\degr < \delta < -26\degr$ to a limiting flux density of ~18 mJy ( $5\sigma$). Due to the very low elevation of the observations, the survey has a much lower resolution in declination than in right ascension ( $54\arcsec \times 54\arcsec~{\rm cosec}\,\delta$). A correlation with the 1.4 GHz NVSS shows that the positional accuracy is less constrained in declination than in right ascension, but there is no significant systematic error. We present a source list containing 73570 sources. We correlate this WISH catalogue with the NVSS to construct a sample of faint Ultra Steep Spectrum (USS) sources, which is accessible for follow-up studies with large optical telescopes in the southern hemisphere. This sample is aimed at increasing the number of known high redshift radio galaxies to allow detailed follow-up studies of these massive galaxies and their environments in the early Universe.

Key words: surveys -- radio continuum: general -- radio continuum: galaxies -- galaxies: active

Offprint request: C. De Breuck, debreuck@iap.fr

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