Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247p...1m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 247, NO. 1/NOV1, P. 1P, 1990
Astronomy and Astrophysics
Astronomy
175
Scientific paper
We present galaxy number-magnitude counts in the range 15 < bj <20.5 from the 4300 square degrees of the APM Galaxy Survey. We have used CCD photometry of 339 galaxies to calibrate the APM magnitudes over a wide range. At bj ˜19-20 our number counts are close to the mean of previously published results. However, our counts show a steep slope between bj=16 and 19 which cannot be explained by local inhomogeneities. Our counts at bj=20.5 are about twice the value predicted by a simple no-evolution model normalized to match the counts at bj≍17. This result implies dramatic evolution of the galaxy population within the past few billion years.
Efstathiou George
Loveday Jon
Maddox Steve J.
Peterson Bruce A.
Sutherland Will J.
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