ON THE GALAXY LUMINOSITY FUNCTION IN THE CENTRAL REGIONS OF THE COMA CLUSTER

• Tipo: Artigo em Revista Científica Internacional
• Data: 1995

Autores

BIVIANO, A (Autor) Outra; DURRET, F (Autor) Outra; GERBAL, D (Autor) Outra; LEFEVRE, O (Autor) Outra; LOBO, C (Autor) Outra; MAZURE, A (Autor) Outra; SLEZAK, E (Autor) Outra

Revista

Título: Astronomy and Astrophysics

Vol. 297

Páginas: 610-616

ISSN: 0004-6361

Editora: EDP Sciences

Indexação

ISI Web of Knowledge - 92 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-001-GX0

Abstract (EN): We have obtained new redshifts for 265 objects in the central 48 x 25 arcmin(2) region of the Coma cluster. When supplemented with literature data, our redshift sample is 95 % complete up to a magnitude b(26.5)=18.0 (the magnitudes are taken from the photometric sample of Godwin et al. 1983). Using redshift-confirmed membership for 205 galaxies, and the location in the colour-magnitude diagram for another 91 galaxies, we have built a sample of cluster members which is complete up to b(26.5)=20.0. We show that the Coma cluster luminosity function cannot be adequately fitted by a single Schechter (1976) function, because of a dip in the magnitude distribution at b(26.5)similar to 17. The superposition of an Erlang (or a Gauss) and a Schechter function provides a significantly better fit. We compare the luminosity function of Coma to those of other clusters, and of the field. Luminosity functions for rich clusters look similar, with a maximum at M(b) similar or equal to -19.5 + 5 x log h(50), while the Virgo and the field luminosity functions show a nearly monotonic behaviour. These differences may be produced by physical processes related to the environment which affect the luminosities of a certain class of cluster galaxies.

Idioma: Inglês

Tipo (Avaliação Docente): Científica