Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241...41t&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 41-53. Research supported by the Alfred P. Sloan Foundation
Astronomy and Astrophysics
Astronomy
114
Astronomical Models, Galaxies, Spatial Distribution, Galactic Evolution, Galactic Structure, Red Shift, Spaceborne Astronomy, Spiral Galaxies, Star Distribution
Scientific paper
New models are presented for the interpretation of recent counts of galaxies to 24th magnitude, and predictions are shown to 28th magnitude for future comparison with data from the Space Telescope. These results supersede earlier, more schematic models by the author. Tyson and Jarvis found in their counts a 'local' density enhancement at 17th magnitude, on comparison with the earlier models; the excess is no longer significant when a more realistic mixture of galaxy colors is used. Bruzual and Kron's conclusion that Kron's counts show evidence for evolution at faint magnitudes is confirmed, and it is predicted that some 23d magnitude galaxies have redshifts greater than unity. These may include spheroidal systems, elliptical galaxies, and the bulges of early-type spirals and SO's, seen during their primeval rapid star formation.
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