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Authors:
L.Cortese, G.Gavazzi, A.Boselli, J.Iglesias-Paramo, L.Carrasco
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Abstract:
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 C_BI = 6484+/-81 km/s and a scale S_BI = 891+/-58 km/s.
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.
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