Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Distortion of Infall Regions in Redshift Space-I   We show that spherical infall models (SIMs) can better describe some galaxy
clusters in redshift slice space than in traditional axially-convolved
projection space. This is because in SIM, the presence of transverse motion
between cluster and observer, and/or shear flow about the cluster (such as
rotation), causes the infall artifact to tilt, obscuring the characteristic
two-trumpet profile; and some clusters resemble such tilted artifacts.
  We illustrate the disadvantages of applying SIM to convolved data and, as an
alternative, introduce a method fitting a tilted 2D envelope to determine a 3D
envelope. We also introduce a fitting algorithm and test it on toy SIM
simulations as well as three clusters (Virgo, A1459, and A1066). We derive
relations useful for using the tilt and width-to-length ratio of the fitted
envelopes to analyze peculiar velocities. We apply them to our three clusters
as a demonstration. We find that transverse motion between cluster and observer
can be ruled out as sole cause of the observed tilts, and that a multi-cluster
study could be a feasible way to find our infall toward Virgo cluster.

9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics