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Galaxies at Intermediate Redshifts

Published online by Cambridge University Press:  07 August 2017

Richard S. Ellis
Richard S. Ellis*
Affiliation:
Physics Department, Durham University Durham DH1 3LE, England

Abstract

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Faint object spectroscopy and deep infrared imaging is providing exciting opportunities to understand the astrophysical nature of normal galaxies up to ≃8-10 Gyr ago (Ho=50). Deep photometry of 10 distant clusters with 0.5< z <1 shows a systematic bluing of red members with look-back time, in good agreement with the view that the bulk of the early type population must be genuinely old (zf >2) and remarkably homogeneous. Statistically complete redshift surveys of the highly abundant population of faint blue field galaxies, however, indicate sizeable changes must have occurred in the galaxy luminosity functions as recently as z≃0.5. Possible explanations include widespread merging of star-forming sub-units of present day galaxies, or an entirely new population of sources whose present-day remnants are intrinsically faint. The contrast between the long term evolution of the spheroidal population and that seen in the faint counts is striking. I finally discuss some new opportunities to identifying field galaxies with z>l using gravitational lensing and QSO absorber identifications.

Type
III. The Stellar Populations of Non-Resolved Galaxies
Information
Symposium - International Astronomical Union , Volume 149: The Stellar populations of Galaxies , 1992 , pp. 297 - 309
Copyright
Copyright © Kluwer 

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