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Faint galaxy surveys.

L L Cowie1, A Songaila

  • 1Institute for Astronomy, Honolulu, HI 96822, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 1, 1993
PubMed
Summary
This summary is machine-generated.

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Galaxy surveys reveal K-band counts turn over around magnitude 17, with galaxies becoming bluer. Beyond redshift 0.6, galaxies appear fainter than expected, suggesting rapid merging.

Area of Science:

  • Astronomy
  • Cosmology
  • Astrophysics

Background:

  • K-band galaxy surveys provide counts from magnitude 10 to 23.
  • Galaxy counts exhibit a Euclidean slope until magnitude 17, then turnover.
  • Galaxies become bluer beyond magnitude 17.

Purpose of the Study:

  • To analyze galaxy counts and properties in the K-band.
  • To investigate galaxy distances and behavior at higher redshifts.
  • To explore potential explanations for observed deviations from standard models.

Main Methods:

  • Utilizing data from various K-band galaxy surveys.
  • Analyzing spectroscopic samples for redshift and distance measurements.
  • Comparing observed galaxy properties with theoretical predictions.

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Main Results:

  • K-band galaxy counts show a turnover around magnitude 17.
  • Galaxies beyond this magnitude are significantly bluer.
  • Conventional distance laws are accurate up to redshift 0.6.
  • Galaxies appear fainter than predicted at redshifts beyond 0.6.

Conclusions:

  • Observed fainter galaxies suggest deviations from standard cosmological models.
  • Rapid galaxy merging at modest redshifts is a favored explanation.
  • Further research is needed to confirm merging as the primary cause.