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The VLT observations of the HDF-S NICMOS field: photometric catalog and high redshift galaxy candidates | | A. Fontana
; S. D’Odorico
; R. Fosbury
; E. Giallongo
; R. Hook
; F. Poli
; A. Renzini
; P. Rosati
; R. Viezzer
; | | Date: |
26 Dec 1998 | | Subject: | astro-ph | | Affiliation: | Osservatorio Astronomico di Roma ESO ST-ECF | | Abstract: | We present the deep UBVRI observations of the HDF-S NICMOS field obtained as part of the Science Verification of the VLT Unit 1 telescope. The images have been used to construct object catalogs and to obtain photometric redshifts. The effective field of view is $simeq 70 imes70$ arcsec$^2$, and the formal $5sigma$ limiting magnitudes (in a 2 FWHM aperture) are 26.3, 27.8, 27.5, 26.9, 25.2 in the $U$, $B$, $V$, $R$ and $I$ bands, respectively. Thanks to the sub-arcsecond image quality, relatively long exposure time, and large collecting area of the VLT, this is the deepest set of multicolor images ever obtained from a ground-based telescope. Galaxy counts have been derived independently in each band, and show no significant departures from previous data from wider areas. A multicolor photometric catalog of all the galaxies selected in the $R$ band has also been obtained and used to derive photometric redshifts for all galaxies with $R leq 26.5 $, using also the J,H and K magnitudes from the NICMOS deep observations. A significant fraction (simeq 28%)of the galaxies is placed at $zgeq 2$. Among them, six robust candidates are found at $z geq 2.5$ . | | Source: | arXiv, astro-ph/9901359 | | Services: | Forum | Review | PDF | Favorites | |
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