Population studies in groups and clusters of galaxies. 4. Comparison of the luminosity functions and morphological-type distributions in seven nearby groups - INSPIRE

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Population studies in groups and clusters of galaxies. 4. Comparison of the luminosity functions and morphological-type distributions in seven nearby groups

Henry G. Ferguson
(
- Johns Hopkins U.
)
,
Allan Sandage
(
)

Mar, 1991

18 pages

Published in:

Astron.J. 101 (1991) 765-782

DOI:

10.1086/115721

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Abstract: (ADS)

Published observational data on the Leo, Dorado, NGC 1400, NGC 5044, Antlia, Fornax, and Virgo groups of galaxies are analyzed in terms of the luminosity functions and morphological types of their members. The data sets employed are characterized, and the results are presented in extensive tables and graphs and discussed in detail. While the fractions of early and late galaxies in the groups are similar, the ratio of dwarfs to giants (D/G) in the early galaxies varies monotonically with the richness of the cluster, leading to artificial flattening at the faint end of the total luminosity function in environments with low D/G. The luminosity function for dwarfs in all environments is found to have a slope of about -1.3. Associated Articles Part 1 Part 2 Part 3 Part 4

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