Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematics and Metallicities of Globular Clusters in M104   We have obtained spectra for globular cluster candidates in M104 with LDSS-2
on the William Herschel Telescope, confirming 34 objects as M104 globular
clusters. We find a cluster velocity dispersion of $\sim$ 260 km/sec, and the
Projected Mass Estimator gives a mass of 5.0 (3.5,6.7) $\times 10^{11}$
M$_\odot$ for M104 within a projected radius of $\sim 330^{''}$ (14 kpc for
D=8.55 Mpc). Our best estimate for the mass-to-light ratio is M/L$_{V_T}$=
16$^{+5.5}_{-5.0}$ within the same radius. Considering all of the possible
sources of uncertainty, we find a lower limit of M/L_V= 5.3, which is larger
than the M/L$_V$ found from rotation curve analyses inside 180$^{''}$. We thus
conclude that the mass-to-light ratio increases with radius, or in other words
that M104 possesses a dark matter halo. There is a marginal detection of
rotation in the M104 cluster system at the 92.5% confidence level; larger
samples will be needed to investigate this possibility. Interestingly, the M104
globular cluster and planetary nebulae (PNe) kinematics are roughly consistent
inside $\sim 100^{''}$. Finally, we find a mean cluster metallicity of [Fe/H] =
$-$0.70 $\pm$ 0.3, which is more typical of clusters in gE/cD galaxies than it
is of clusters in other spirals.

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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: math-ph