Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Large Peculiar Velocity of the cD Galaxy in Abell 3653   We present a catalogue of galaxies in Abell 3653 from observations made with
the 2dF spectrograph at the Anglo-Australian Telescope. Of the 391 objects
observed, we find 111 are bone-fide members of Abell 3653. We show that the
cluster has a velocity of cz = 32214 +/- 83 km/s (z=0.10738 +/- 0.00027), with
a velocity dispersion typical of rich, massive clusters of sigma_{cz} =
880^{+66}_{-54}. We find that the cD galaxy has a peculiar velocity of 683 +/-
96 km/s in the cluster restframe - some 7sigma away from the mean cluster
velocity, making it one of the largest and most significant peculiar velocities
found for a cD galaxy to date. We investigate the cluster for signs of
substructure, but do not find any significant groupings on any length scale. We
consider the implications of our findings on cD formation theories.

12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con