Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..498m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 498-522. SERC-supported research
Astronomy and Astrophysics
Astronomy
272
Charge Coupled Devices, Cosmology, Galaxies, Imaging Techniques, Luminous Intensity, Magnitude, Astronomical Models, Stellar Color
Scientific paper
Using the Prime Focus CCD Camera at the Isaac Newton Telescope, the form of the B and R galaxy number-magnitude count relations is determined in 12 independent fields for B(ccd) = 21.25 m and R(ccd) = 19-23.5 m. The average galaxy count relations lie in the middle of the wide range previously encompassed by photographic data. These new data confirm that the B, and also the R, galaxy counts show evidence for strong galaxy luminosity evolution, and that the majority of the evolving galaxies are of moderately blue color. This result is discussed in the light of current theories of galaxy evolution. Simple models of the type described by Bruzual may explain both n(B) data and the n(z) data available in faint galaxy redshift surveys, at least if an intermediate value for the uncertain bright count normalization is assumed. There is therefore no need to invoke a more complicated, luminosity-dependent evolution of the type suggested by Broadhurst et al. (1988).
Fong Richard
Jones Robert L.
Metcalfe Nigel
Shanks Tom
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