Volume 425, Number 2, October II 2004
|Page(s)||429 - 441|
|Published online||21 September 2004|
Universitá degli Studi di Milano-Bicocca, P.zza della Scienza 3, 20126 Milano, Italy e-mail: [Luca.Cortese;Giuseppe.Gavazzi]@mib.infn.it
2 Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille, France e-mail: [alessandro.boselli;jorge.iglesias]@oamp.fr
3 Instituto Nactional de Astrofisica, Optica y Electronica, Apartado Postal 51, CP 72000 Puebla, Pue., Mexico e-mail: firstname.lastname@example.org
4 Observatorio Astronomico Nacional/UNAM, Ensenada BC, Mexico
Accepted: 4 June 2004
We present a dynamical analysis of the central ~1.3 square degrees of the cluster of galaxies Abell 1367, based on 273 redshift measurements (of which 119 are news). From the analysis of the 146 confirmed cluster members we derive a significantly non-Gaussian velocity distribution, with a mean location and a scale . The cluster appears elongated from the North-West to the South-East with two main density peaks associated with two substructures. The North-West subcluster is probably in the early phase of merging into the South-East substructure (~0.2 Gyr before core crossing). A dynamical study of the two subclouds points out the existence of a group of star-forming galaxies infalling into the core of the South-East subcloud and suggests that two other groups are infalling into the NW and SE subclusters respectively. These three subgroups contain a higher fraction of star-forming galaxies than the cluster core, as expected during merging events. Abell 1367 appears as a young cluster currently forming at the intersection of two filaments.
Key words: galaxies: clusters: individual: A1367 / galaxies: evolution / galaxies: distances and redshifts
Based on observations obtained with the William Herschel Telescope operated on the island of La Palma (Spain) by the Isaac Newton Group, with the Loiano telescope belonging to the University of Bologna (Italy) and with the G.Haro telescope of the INAOE (Mexico).
© ESO, 2004
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