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Very High-Redshift Lensed Galaxies

Published online by Cambridge University Press:  15 June 2005

R. Pelló
Affiliation:
Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées, UMR5572, 14 Av. Edouard Belin, F-31400 Toulouse, France, email: [email protected], [email protected], [email protected]
D. Schaerer
Affiliation:
Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées, UMR5572, 14 Av. Edouard Belin, F-31400 Toulouse, France, email: [email protected], [email protected], [email protected] Observatoire de Genève, 51, Ch. des Maillettes, CH-1290 Sauverny, Switzerland, email: [email protected]
J. Richard
Affiliation:
Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées, UMR5572, 14 Av. Edouard Belin, F-31400 Toulouse, France, email: [email protected], [email protected], [email protected]
J.- F. Le Borgne
Affiliation:
Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées, UMR5572, 14 Av. Edouard Belin, F-31400 Toulouse, France, email: [email protected], [email protected], [email protected]
J.- P. Kneib
Affiliation:
Caltech Astronomy, MC105-24, Pasadena, CA 91125, USA, email: [email protected] Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, B.P.8, 13376 Marseille Cedex 12, France
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Abstract

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We review in this paper the main results recently obtained on the identification and study of very high-z galaxies using lensing clusters as natural gravitational telescopes. We present in detail our pilot survey with ISAAC/VLT, aimed at the detection of z$>7$ sources. Evolutionary synthesis models for extremely metal-poor and PopIII starbursts have been used to derive the observational properties expected for these high-$z$ galaxies, such as expected magnitudes and colors, line fluxes for the main emission lines, etc. These models have allowed to define fairly robust selection criteria to find z$\sim 7-10$ galaxies based on broad-band near-IR photometry in combination with the traditional Lyman drop-out technique. The first results issued from our photometric and spectroscopic survey are discussed, in particular the preliminary confirmation rate, and the global properties of our high-z candidates, including the latest results on the possible z=10.0 candidate A1835-1916. The search efficiency should be significantly improved by the future near-IR multi-object ground-based and space facilities. However, strong lensing clusters remain a factor of $\sim$ 5-10 more efficient than blank fields in the z $\sim$ 7-11 domain, within the FOV of a few arcminutes around the cluster core, for the typical depth required for this survey project.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Copyright
© 2004 International Astronomical Union