Other
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..217i&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, Feb. 1986, p. 217-225. NSERC-supported research.
Other
51
Astronomical Photometry, Color, Galaxies, Southern Sky, Astronomical Models, Data Reduction, Errors, Luminosity, Size Distribution
Scientific paper
Counts and colors of faint galaxies have been obtained for a 0.55 square degree area near the South Galactic Pole. The observed increase in differential galaxy counts with magnitude possesses a slope d(log N)/dm approximately 0.40 in J and 0.35 in r. These slopes are in good agreement with those determined by a number of other authors. On the other hand, there appear to be significant field-to-field fluctuations in the normalization of galaxy counts over and above what might be expected from variations in interstellar absorption or photometric uncertainties. Both counts and colors of galaxies are consistent with models requiring some galaxy evolution. The size distribution of galaxies shows a tendency for larger galaxies to be bluer; this result is consistent with the fact that galaxies at fixed apparent magnitude are expected to be both larger and bluer when observed at larger redshift. Observations of a faint, rich cluster in the field show (1) a break in the integral luminosity function consistent with a redshift z approximately 0.3, and (2) a significant population of blue galaxies, in agreement with the recent suggestion by Butcher and Oemler (1984) that some galaxy evolution has occurred in galaxy clusters at recent epochs.
Infante Leopoldo
Pritchet Chris
Quintana Hernan
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