Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369...79l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 1, 1991, p. 79-105.
Astronomy and Astrophysics
Astronomy
330
Astronomical Photography, Faint Object Camera, Galactic Evolution, Image Processing, Red Shift, Sky Surveys (Astronomy), Astronomical Catalogs, Charge Coupled Devices, Deep Space, Infrared Photometry
Scientific paper
Deep images in four optical passbands with limiting magnitudes for galactic images of roughly 27th AB magnitudes are used here to study the population of faint galaxies. While confirming the existence of a blueward trend of galaxy colors at faint magnitudes, it is found that the colors of the faintest galaxies are generally not as blue as found by Tyson (1988). The slope of the B-band source counts appears to decrease below the bright-end slope of 0.465 for magnitudes fainter than B about 24, thus removing the potential divergence of the integrated night-sky brightness. Spectroscopy of a small but representative sample of galaxies with B(AB) less than 24.1 yields a high success rate of spectroscopic identification and redshift determination. It is confirmed that significant evolution must be occurring between B(AB) about 21.5 and about 23.5. The evolution is best characterized as an increase of Phi-asterisk rather than L-asterisk.
Cowie Lennox L.
Gardner Jeffrey P.
Lilly Simon J.
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