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Astron. Astrophys. 336, 98-102 (1998)

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On the universality of the type-dependent luminosity functions

S. Andreon

Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy (email: andreon@na.astro.it)

Received 13 November 1997 / Accepted 24 April 1998


We find that the bright part ([FORMULA] mag) of luminosity function of each Hubble type has the same shape in three poor clusters (Virgo, Fornax and Centaurus) and in two rich clusters (Coma and Cl0939+4713). The fact that these type-dependent luminosity functions are invariant in shape from poor to rich environments gives support to the hypothesis that they may be universal. We also present in tabular form improved type-dependent luminosity functions, based on a much larger sample than previous works.

Key words: galaxies: elliptical and lenticular, cD – galaxies: spiral – galaxies: luminosity function, mass function

© European Southern Observatory (ESO) 1998

Online publication: July 7, 1998