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COMBO-17+4: An Optical-NIR Survey for Galaxies out to z=2

Published online by Cambridge University Press:  01 August 2006

M-H. Nicol ,
K. Meisenheimer ,
C. Tapken  and
C. Wolf
M-H. Nicol
Affiliation:
Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany email:[email protected]
K. Meisenheimer
Affiliation:
Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany email:[email protected]
C. Tapken
Affiliation:
Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany email:[email protected]
C. Wolf
Affiliation:
Departement of Physics, Denys Wilkinson Bldg., University of Oxford, Keble Road, Oxford, OX1 3RH, UK
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Abstract

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Classifying Object by Medium-Band Observations in 17 filters (COMBO-17) has already produced a very accurate picture of galaxy evolution since z~1 based on 25000 galaxies in 17 medium optical bands. We now extend the range of reliable multi-color redshifts with COMBO-17+4, a deep optical-NIR survey which will combine the existing optical data set of COMBO-17 with near infrared observation in three medium bands: Y(λ/Δλ = 1040/80nm), J1(1190/130nm) and J2(1320/130nm) and one broad band H(1650/300nm). The NIR bands extend the photometric redshift range to z~2.1. COMBO 17+4 will provide the first large sample of galaxies (>5000) at 1<z<2 with a redshifts accuracy of Δz<0.03(1+z). Three fields are observed: Abell 901, Abell 226 and the COMBO 11h-field, for a total coverage of 0.77□2 of the sky. Each COMBO 17+4 field measures 31 × 30 sqarcmin. The NIR bands are observed with the Omega2000 camera at Calar Alto Observatory in Spain.

The scientific goals for this study are multiple. COMBO-17+4 will enable us to establish the luminosity function for the red sequence and blue galaxies in the redshift range 1<z<2. Also it will be possible to determine the formation history at z=2 by analyzing the width of the red sequence galaxies. Moreover this survey will provide several thousand of individual galaxy masses (with an accuracy <30%) obtained with Spectral Energy Distribution (SED) template fitting. Once the masses are obtained the mass function will provide a useful tool to test the hierarchical model of evolution of galaxies by checking whether the massive red sequence galaxies (logM>10.5) are already in place at z>1.5 (9Gyr).

We present first results from the full 21 bands photometry in half of the Abell 901 field. It allows us to study not only z>1 galaxies but also the stellar content of several hundred cluster galaxies.

Keywords

surveysgalaxies: evolutiongalaxies: photometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 419
Copyright
Copyright © International Astronomical Union 2007

References

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