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The VIMOS VLT deep survey The K -band follow-up in the 0226-04 field

S. Temporin, A. Iovino, M. Bolzonella, H. J. McCracken, M. Scodeggio, B. Garilli, D. Bottini, V. Le Brun, O. Le Fèvre, D. Maccagni, J.-P. Picat, R. Scaramella, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, A. Cappi, S. Charlot, P. Ciliegi, T. Contini, O. Cucciati, S. Foucaud, P. Franzetti, I. Gavignaud, L. Guzzo, O. Ilbert, B. Marano, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, S. Paltani, R. Pellò, A. Pollo, L. Pozzetti, M. Radovich, D. Vergani, G. Zamorani, E. Zucca, M. Bondi, A. Bongiorno, J. Brinchmann, S. de la Torre, F. Lamareille, Y. Mellier, C. J. Walcher

Aims. We present a new Ks-band survey that represents a significant extension to the previous wide-field Ks-band imaging survey within the 0226-04 field of the VIMOS-VLT deep survey (VVDS). The new data add ∼458 arcmin2 to the previous imaging program, thus allowing us to cover a total contiguous area of ∼600 arcmin2 within this field.
Methods. Sources were identified both directly on the final K-band mosaic image and on the corresponding, deep χ2 −g'r'i' image from the CFHT Legacy Survey in order to reduce contamination, while ensuring compilation of a truly K-selected catalogue down to the completeness limit of the Ks-band. The newly determined Ks-band magnitudes are used in combination with the ancillary multiwavelength data for determining accurate photometric redshifts.
Results. The final catalogue totals ∼52 000 sources, out of which ∼4400 have a spectroscopic redshift from the VVDS first epoch survey. The catalogue is 90% complete down to KVega = 20.5 mag. We present Ks-band galaxy counts and angular correlation function measurements down to this magnitude limit. Our results are in good agreement with previously published work. We show that using K magnitudes to determine photometric redshifts significantly lowers the incidence of catastrophic errors. The data presented in this paper are publicly available through the CENCOS database.

Astronomy & Astrophysics
Volume 482, Page 81
2008 April

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia