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News from z ~ 6 − 10 galaxy candidates found behind gravitational lensing clusters

Published online by Cambridge University Press:  01 August 2006

D. Schaerer ,
A. Hempel ,
R. Pello ,
E. Egami ,
J. Richard ,
J.-P. Kneib  and
M. Wise
D. Schaerer
Affiliation:
Geneva Observatory, 51 Ch. des Maillettes, CH–1290 Sauverny, Switzerland email:daniel.schaerer@obs.unige.ch Observatoire Midi-Pyréneés, 14 Avenue E. Belin, F-31400 Toulouse, France
A. Hempel
Affiliation:
Geneva Observatory, 51 Ch. des Maillettes, CH–1290 Sauverny, Switzerland email:daniel.schaerer@obs.unige.ch
R. Pello
Affiliation:
Observatoire Midi-Pyréneés, 14 Avenue E. Belin, F-31400 Toulouse, France
E. Egami
Affiliation:
Steward Observatory, University Arizona, AZ 85721, USA
J. Richard
Affiliation:
Caltech Astronomy, MC105-24, Pasadena, CA 91125, USA
J.-P. Kneib
Affiliation:
OAMP, UMR 6110 Traverse du Siphon, 13012 Marseille, France
M. Wise
Affiliation:
Astronomical Institute Anton Pannekoek, NL-1098 SJ Amsterdam, The Netherlands,
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Abstract

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Following up on the detailed results from our searches for z~ 6–10 galaxies using gravitional lensing clusters descrived in Richard et al. (2006), we have obtained new observations, which are presented here. For a general overview of the project see Schaerer et al. (2006). First, deep HST/ACS observations in the z-band confirm 17 out of 18 high redshift candidates as optical drop-out objects; the remaining object appears faint and star-like. Second, Spitzer/IRAC images at 3.6, 4.5, 5.8 and 8.0 μm have been obtained. 11 out of 18 candidates are in “free”, uncominated regions. These 11 high-z candidates are undetected, with upper limits which are compatible with their SED if these objects are blue star-forming galaxies at high redshift (see Fig. 1). In conclusion, our new observations corroborate so far the high-z nature of the majority of the candidates.

Keywords

galaxies:high-redshiftinfrared: galaxiesearly universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 425
Copyright
Copyright © International Astronomical Union 2007

References

Richard, J. 2006, A&A, 456, 861Google Scholar
Schaerer, D. 2006, The Messenger, 125, 20 [astro-ph/0610138]Google Scholar