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Title:
Discovery of bright z ~ 7 galaxies in the UltraVISTA survey
Authors:
Bowler, Rebecca A. A.; Dunlop, James S.; McLure, Ross J.
Affiliation:
AA(SUPA, Institute for Astronomy, University of Edinburgh, Edinburgh, EH9 3HJ ), AB(SUPA, Institute for Astronomy, University of Edinburgh, Edinburgh, EH9 3HJ ), AC(SUPA, Institute for Astronomy, University of Edinburgh, Edinburgh, EH9 3HJ )
Publication:
The Intriguing Life of Massive Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 295, pp. 22-22
Publication Date:
07/2013
Origin:
CUP
Keywords:
galaxies: evolution, galaxies: formation, galaxies: high-redshift,
Abstract Copyright:
(c) 2013: Copyright © International Astronomical Union 2013
DOI:
10.1017/S1743921313004183
Bibliographic Code:
2013IAUS..295...22B

Abstract

We have exploited the new, deep, near-infrared Y,J,H,Ks UltraVISTA imaging of the COSMOS field, in tandem with deep optical and mid-infrared imaging, to conduct a new search for luminous galaxies at redshifts z ~= 7. We have utilised this unique multi-wavelength dataset to select galaxy candidates at redshifts z > 6.5 by searching first for Y+J-detected objects which are undetected in the CFHT and HST optical data. This sample was then refined using a photometric redshift fitting code, enabling the rejection of lower-redshift galaxy contaminants and cool galactic M, L, T dwarf stars. The final result of this process is a small sample of (at most) ten credible galaxy candidates at z > 6.5 (from over 200,000 galaxies detected in the year-one UltraVISTA data). The new z ~= 7 galaxies reported here are the first credible z ~= 7 Lyman-break galaxies discovered in the COSMOS field and, as the most UV-luminous discovered to date at these redshifts, are prime targets for deep follow-up spectroscopy. We explore their physical properties, and briefly consider the implications of their inferred number density for the form of the galaxy luminosity function at z ~= 7.

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