EDP Sciences
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Volume 417, Number 1, April I 2004
Page(s) 51 - 60
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20034458

A&A 417, 51-60 (2004)
DOI: 10.1051/0004-6361:20034458

The VIRMOS deep imaging survey

III. ESO/WFI deep U-band imaging of the 0226-04 deep field
M. Radovich1, M. Arnaboldi1, 2, V. Ripepi1, M. Massarotti1, H. J. McCracken3, 4, Y. Mellier5, 6, E. Bertin5, 6, G. Zamorani4, 7, C. Adami8, S. Bardelli4, O. Le Fèvre8, S. Foucaud8, B. Garilli9, R. Scaramella10, G. Vettolani4, A. Zanichelli7 and E. Zucca4

1  INAF, Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy
2  INAF, Osservatorio Astronomico di Pino Torinese, via Osservatorio 20, 10025 Torino, Italy
3  Università degli Studi di Bologna, Dipartimento di Astronomia, via Ranzani 1, 40127 Bologna, Italy
4  INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
5  Institut d'Astrophysique de Paris, 98bis Bd. Arago, 75014 Paris, France
6  Observatoire de Paris, LERMA, 61 avenue de l'Observatoire, 75014 Paris, France
7  Istituto di Radioastronomia del CNR, via Gobetti 101, 40129 Bologna, Italy
8  Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, 13376 Marseille Cedex 12, France
9  Istituto di Astrofisica Spaziale e Fisica Cosmica del CNR, via Bassini 15, 20133 Milano, Italy
10  INAF, Osservatorio Astronomico di Roma, via Osservatorio 2, 00040 Monteporzio Catone (Roma), Italy

(Received 6 October 2003 / Accepted 5 December 2003)

In this paper we describe the U-band imaging of the F02 deep field, one of the fields in the VIRMOS Deep Imaging Survey. The observations were done at the ESO/MPG 2.2 m telescope at La Silla (Chile) using the 8k $\times$ 8k Wide-Field Imager (WFI). The field is centered at $\alpha$(J2000 )=02 $^{\rm h}$26 $^{\rm m}$00 $^{\rm s}$ and $\delta$(J2000 $)=-04^{\circ}$30´00´´, the total covered area is 0.9  $\deg^2$ and the limiting magnitude (50% completeness) is $U_{\rm AB} \sim 25.4$ mag. Reduction steps, including astrometry, photometry and catalogue extraction, are first discussed. The achieved astrometric accuracy (rms) is ~ $0.2\arcsec$ with reference to the I-band catalog and ~ $0.07\arcsec$ internally (estimated from overlapping sources in different exposures). The photometric accuracy including uncertainties from photometric calibration, is < 0.1 mag. Various tests are then performed as a quality assessment of the data. They include: (i) the color distribution of stars and galaxies in the field, done together with the BVRI data available from the VIMOS survey; (ii) the comparison with previous published results of U-band magnitude-number counts of galaxies.

Key words: catalogs -- surveys -- galaxies: general

Offprint request: M. Radovich, radovich@na.astro.it

© ESO 2004