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research
Reconstructing Positions \& Peculiar Velocities of Galaxy Clusters within 25000 km/sec: The Bulk Velocity
Authors
Dennis W. Sciama
Enzo Branchini,
+3Â more
Kaiser N.
Manolis Plionis,
Plionis M.
Publication date
10 December 1995
Publisher
'University of Chicago Press'
Doi
Cite
View
on
arXiv
Abstract
Using a dynamical 3-D reconstruction procedure we estimate the peculiar velocities of
R
≥
0
R\ge0
R
≥
0
Abell/ACO galaxy clusters from their measured redshift within 25000 km/sec. The reconstruction algorithm relies on the linear gravitational instability hypothesis, assumes linear biasing and requires an input value of the cluster
β
\beta
β
-parameter (
β
c
≡
Ω
∘
0.6
/
b
c
\beta_c \equiv \Omega_{\circ}^{0.6}/b_c
β
c
​
≡
Ω
∘
0.6
​
/
b
c
​
), which we estimated in Branchini \& Plionis (1995) to be
β
c
≃
0.21
\beta_c\simeq 0.21
β
c
​
≃
0.21
. The resulting cluster velocity field is dominated by a large scale streaming motion along the Perseus Pisces--Great Attractor base-line directed towards the Shapley concentration, in qualitative agreement with the galaxy velocity field on smaller scales. Fitting the predicted cluster peculiar velocities to a dipole term, in the local group frame and within a distance of
∼
18000
\sim 18000
∼
18000
km/sec, we recover extremely well both the local group velocity and direction, in disagreement with the Lauer \& Postman (1994) observation. However, we find a
∼
6
%
\sim 6\%
∼
6%
probability that their observed velocity field could be a realization of our corresponding one, if the latter is convolved with their large distance dependent errors. Our predicted cluster bulk velocity amplitude agrees well with that deduced by the POTENT and the da Costa et al. (1995) analyses of observed galaxy motions at
∼
5000
−
6000
\sim 5000 - 6000
∼
5000
−
6000
km/sec; it decreases thereafter while at the Lauer \& Postman limiting depth (
∼
15000
\sim 15000
∼
15000
km/sec) its amplitude is
∼
150
\sim 150
∼
150
km/sec, in comfortable agreement with most cosmological models.Comment: 8 pages, uuencoded compressed tarred postscript file uncluding text and 3 figures. Accepted in ApJ Letter
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