The VIRMOS deep imaging survey

Free access article

Issue		A&A 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

III. ESO/WFI deep U-band imaging of the 0226-04 deep field

M. Radovich¹, M. Arnaboldi^{1, 2}, V. Ripepi¹, M. Massarotti¹, H. J. McCracken^{3, 4}, Y. Mellier^{5, 6}, E. Bertin^{5, 6}, G. Zamorani^{4, 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)

Abstract
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

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