Hrant Tovmassian
Instituto Nacional de Astrofísica Óptica y Electrónica, Apdo. Postal 51 y 216, C.P. 72000, Puebla, Puebla, Mexico. (hrant@inaoep.mx).
Received 2009 August 25
Accepted 2009 November 4
RESUMEN
]]> Comparamos las magnitudes absolutas en la banda K de las galaxias más brillantes en cúmulos de Bautz–Morgan tipo I con las de las galaxias brillantes de grupos fósiles. Demostramos que las galaxias más brillantes en grupos fósiles son, en promedio, más débiles que sus contrapartes en los cúmulos. Además, mostramos que la luminosidad de la galaxia más brillante depende de la riqueza del cúmulo. Concluimos que los precursores de grupos fósiles fueron en promedio cúmulos pobres.
ABSTRACT
We compare the absolute magnitudes in the K–band of the brightest galaxies in clusters of Bautz–Morgan type I with those of the fossil group brightest galaxies. It is found that the brightest galaxies in fossil groups are on average fainter than the brightest galaxies in clusters. It is also shown that the brightness of the brightest galaxy depends on the cluster richness. It is concluded that the precursors of fossil groups were on average poor clusters.
Key Words: galaxies: clusters: general — galaxies: elliptical and lenticular, cD.
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