Pelló, R. and Schaerer, D. and Richard, J. and Le Borgne, J.-F. and Kneib, J. -P. (2005) Very High-Redshift Lensed Galaxies. In: Impact of Gravitational Lensing on Cosmology. IAU Symposia (225). International Astronomical Union , Cambridge, pp. 373-386. ISBN 978-0-521-85196-1 http://resolver.caltech.edu/CaltechAUTHORS:20110921-122932593
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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~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 ~5−10 more efficient than blank fields in the z~7−11 domain, within the FOV of a few arcminutes around the cluster core, for the typical depth required for this survey project.
|Item Type:||Book Section|
|Additional Information:||© 2004 International Astronomical Union. Published online: 15 June 2005. We are grateful to A. Ferrara, M. Lemoine-Busserolle, D. Valls-Gabaud, G. Mathez, T. Contini and F. Courbin for comments and discussions. Based on observations collected at the European Southern Observatory, Chile (70.A-0355, DDT 271.A-5013, 71.A-0397, 73.A-0471), the NASA/ESA Hubble Space Telescope operated by the Association of Universities for Research in Astronomy, Inc., and the Canada-France-Hawaii Telescope operated by the National Research Council of Canada, the French CNRS and the University of Hawaii. Part of this work was supported by the CNRS and the Swiss National Foundation.|
|Official Citation:||R. Pelló, D. Schaerer, J. Richard, J.- F. Le Borgne and J.- P. Kneib (2004). Very High-Redshift Lensed Galaxies. Proceedings of the International Astronomical Union, 2004, pp 373-386 doi:10.1017/S1743921305002188|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||21 Sep 2011 22:29|
|Last Modified:||21 Sep 2011 22:29|
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