The galaxy luminosity function and environmental dependencies
The observational data base for the Nearby Galaxies Atlas (Tully and Fisher, 1987) and Nearby Galaxies Catalog (Tully, 1988) is analyzed statistically, with a focus on three problems related to the galactic luminosity function (GLF). Sample data are presented in tables and graphs; the GLF is formula...
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Veröffentlicht in: | Astron. J.; (United States) 1988-07, Vol.96, p.73-80 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The observational data base for the Nearby Galaxies Atlas (Tully and Fisher, 1987) and Nearby Galaxies Catalog (Tully, 1988) is analyzed statistically, with a focus on three problems related to the galactic luminosity function (GLF). Sample data are presented in tables and graphs; the GLF is formulated as M(asterisk) = -20.18 + 1.25(1 + alpha) + 5log h(75); and alpha = -1.0 is recommended. An expression for the degree of incompleteness in the catalog is then derived as a function of galaxy distance, and the correlation between galactic morphology and the local density function is explored. It is shown that gas-poor, early-type, and gas-rich galaxies tend to appear in regions of high, intermediate, and low density, respectively. Within the gas-rich subset, however, morphology and luminosity are found to be poorly correlated with density. (T.K.) |
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ISSN: | 0004-6256 |
DOI: | 10.1086/114790 |