Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Peculiar Motions Of Clusters In The Perseus-Pisces Region   We present results of a new study of peculiar motions of 7 clusters in the
Perseus-Pisces (PP) region, using the Fundamental Plane as a distance
indicator. The sample is calibrated by reference to 9 additional clusters with
data from the literature. Careful attention is paid to the matching of
spectroscopic and photometric data from several sources. For six clusters in
the PP supercluster no significant peculiar motions are detected. For these
clusters we derive a bulk motion of 60 +/- 220 km/s, in the CMB frame, directed
towards the Local Group. This non-detection is in marginal conflict with
previous Tully-Fisher studies. Two clusters in the background of the
supercluster exhibit significant negative peculiar velocities, characteristic
of backside infall into PP. A bulk-flow fit to all 16 clusters reveals a
statistically insignificant motion of 430 +/- 280 km/s towards l=265, b=26 (CMB
frame). Comparison with the velocity field predicted from the IRAS 1.2Jy survey
yields \beta = 1.0 +/- 0.5. We find no evidence for residual bulk motions
generated by mass concentrations beyond the limiting depth of the IRAS density
field.

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The categories of this paper are: stat
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex