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Galaxy Evolution from Deep Galaxy Counts

Published online by Cambridge University Press:  07 August 2017

J. P. Gardner
J. P. Gardner*
Affiliation:
University of Durham, Department of Physics, South Road, Durham DE1 3LE, U.K. ([email protected])

Abstract

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We present deep galaxy number counts and colours of K – band selected galaxy surveys. We argue that primeval galaxies are present within the survey data, but have remained unidentified. There are few objects with the colours of an L∗ elliptical galaxy at a redshift of z ≈ 1, in contradiction to standard luminosity evolution models. We present K – band photometry of the objects in a spectroscopic redshift survey selected at 21 < B < 22.5. The absolute K magnitudes of the galaxies are consistent with the no-evolution or pure luminosity evolution models. The excess faint blue galaxies seen in the B – band number counts at intermediate magnitudes are a result of a low normalization, and do not dominate the population until B ≈ 25. Extreme merging or excess dwarf models are not needed at z < 1.

Type
Session 7: Galaxies at Large Redshift
Information
Symposium - International Astronomical Union , Volume 164: Stellar Populations , 1995 , pp. 311 - 319
Copyright
Copyright © Kluwer 1995 

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