Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A study of the core of the Shapley Concentration: V. The A3528 complex:
  a young merger event?   We present the results of a redshift survey of galaxies in the A3528 complex,
a chain of interacting clusters in the core of the Shapley Concentration. This
complex is characterized in the X-ray band by two pairs of roughly similar
interacting clumps: one pair has been resolved as two optical Abell clusters
(A3530 and A3532), while the two components of the other pair are both
associated to A3528. The optical data show that the distance between the
centers of A3530 and A3532 is smaller than their Abell radii, an indication of
the existence at least of tidal interactions, and that the contours of galaxies
in A3528 appear to be elongated in the North-South direction, pointing towards
the A3530-A3532 pair.
  From our survey we obtained ~600 new radial velocity determinations: using
this sample, we studied the dynamics of the four Abell clusters in this region
(A3528, A3530, A3532 and A3535) and derived their mean velocities and velocity
dispersions. Moreover we performed a substructure analysis, both bi-dimensional
and three-dimensional, of the whole complex.
  All the characteristics of this structure seem to point toward a merging
scenario in an early stage, whose effects on the galaxy population and on the
cluster dynamics are not yet evident, contrary to what happens in the nearby
A3558 complex, where the merging events are in a rather advanced stage and were
already able to induce modifications in the galaxy population.

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The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
18
The categories of this paper are: econ
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The categories of this paper are: eess
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg