Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass-to-Light Ratios of 2dF Galaxies   We compute M_260, the dynamical mass interior to a radius of 260 kpc/h, for a
set of 809 isolated host galaxies in the 100k data release of the 2dF Galaxy
Redshift Survey. The hosts are surrounded by 1556 satellite galaxies, as
defined by a set of specific selection criteria. Our mass estimator and
host/satellite selection criteria are taken from those used by the Sloan
Digital Sky Survey (SDSS) collaboration for an analysis of M_260 for SDSS
galaxies and, overall, our results compare well with theirs. For L > 2L* we
find M_260/L = (193 +/- 14)h Msun/Lsun, with a tendency for hosts with L < 2L*
to have a somewhat higher M/L. We also investigate M/L seperately for bright
galaxies with ellipitical, S0, and spiral morphologies. There are 159 hosts in
the elliptical/S0 sample, for which we find M_260/L = (271 +/- 26) h Msun/Lsun
for galaxies with L > 2L*, and a weak tendency for intrinsically fainter
galaxies to have a somewhat higher M/L. In stark contrast to this, we find the
line of sight velocity dispersion for the 243 spiral hosts to be independent of
the host galaxy luminosity, yielding a value of sigma_v = 189 +/- 19 km/s. Thus
for the spiral hosts, M_260/L is proportional to L^{-1.0 +/- 0.2}, and we find
M_260/L for a 2L* spiral is of order 200 h Msun/Lsun.

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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga