Morphological number counts and redshift distributions to I=25 from the Hubble Deep Fields: constraints on cosmological models from early-type galaxies

S Phillipps*, SP Driver, WJ Couch, A Fernandez-Soto, PD Bristow, SC Odewahn, RA Windhorst, K Lanzetta

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

9 Citations (Scopus)

Abstract

We combine magnitude and photometric redshift data on galaxies in the Hubble Deep Fields with morphological classifications in order to separate out the distributions for early-type galaxies. The updated morphological galaxy number counts down to I = 25 and the corresponding redshift distributions are used as joint constraints on cosmological models; in particular, on the values of the density parameter Omega (0) and the normalized cosmological constant lambda (0). We find that an Einstein-de Sitter universe with simple passive evolution gives an excellent fit to the counts and redshift data at all magnitudes. An open, low-Omega (0) model with no net evolution (and conservation of the number of ellipticals), which fits the counts equally well, is somewhat less successful, predicting slightly lower mean redshifts and, more significantly, the lack of a high-z tail. A number-conserving model with a dominant contribution from lambda (0), on the other hand, is far less successful, predicting a much narrower distribution than is seen. More complex models are obviously possible, but we conclude that if large-scale transmutation between types does not occur, then the lambda-dominated models provide a very poor fit to the current data.

Translated title of the contributionMorphological Number Counts and Redshift Distributions to I=25 from the Hubble Deep Fields: Constraints on Cosmological Models from Early Type Galaxies
Original languageEnglish
Pages (from-to)807-812
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume319
Issue number3
Publication statusPublished - 11 Dec 2000

Bibliographical note

Publisher: Blackwell Science

Keywords

  • galaxies : evolution
  • galaxies : photometry
  • cosmology : observations
  • COLOR-MAGNITUDE RELATION
  • ELLIPTIC GALAXIES
  • LUMINOSITY FUNCTION
  • STAR-FORMATION
  • RADIO GALAXY
  • EVOLUTION
  • UNIVERSE
  • HISTORY
  • IRREGULARS
  • SEQUENCE

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