Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surveying the Local Supercluster Plane   We investigate the distribution and velocity field of galaxies situated in a
band of 100 by 20 degrees centered on M87 and oriented along the Local
supercluster plane. Our sample amounts 2158 galaxies with radial velocities
less than 2000 km/s. Of them, 1119 galaxies (52%) have distance and peculiar
velocity estimates. About 3/4 of early-type galaxies are concentrated within
the Virgo cluster core, most of the late-type galaxies in the band locate
outside the virial radius. Distribution of gas-rich dwarfs with $M_{\rm H\,I} >
M_*$ looks to be insensitive to the Virgo cluster presence. Among 50 galaxy
groups in the equatorial supercluster band 6 groups have peculiar velocities
about 500-1000 km/s comparable with virial motions in rich clusters. The most
cryptic case is a flock of nearly 30 galaxies around NGC4278 (Coma I cloud),
moving to us with the mean peculiar velocity of $-$840 km/s. This cloud (or
filament?) resides at a distance of 16.1 Mpc from us and approximately 5 Mpc
away from the Virgo center. Galaxies around Virgo cluster exhibit Virgocentric
infall with an amplitude of about 500 km/s. Assuming the spherically symmetric
radial infall, we estimate the radius of the zero-velocity surface to be $R_0 =
(7.0\pm0.3)$ Mpc that yields the total mass of Virgo cluster to be
$(7.4\pm0.9)\times 10^{14} M_{\odot}$ in tight agreement with its virial mass
estimates. We conclude that the Virgo outskirts does not contain significant
amounts of dark mater beyond its virial core.

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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph