Galaxy number counts from K = 10 to K = 23

Details Galaxy number counts from K = 10 to K = 23 Galaxy number counts from K = 10 to K = 23

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415l...9g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 415, no. 1, p. L9-L12.

Astronomy and Astrophysics

Astronomy

191

Extremely High Frequencies, Galactic Evolution, Infrared Sources (Astronomy), Color-Magnitude Diagram, Luminosity

Scientific paper

We present K-band galaxy number counts from four surveys in the range 12 - 23 and compare them to other existing data. We show that the slope of the counts changes at K of about 17 from 0.67 to 0.26. Similarly, we show that the median B-K color turns over at K of about 17, and the population of galaxies fainter than K of about 18 rapidly becomes bluer. We show that the B-band and the K-band number counts are consistent with this color effect. The number counts are compared to passive evolution models, and the flat universe with nonzero cosmological constant model is ruled out by the data. The population of field galaxies changes at K of about 17, where one would expect to see K* elliptical galaxies at a redshift of z of about 1.

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