Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The total mass and dark halo properties of the Small Magellanic Cloud   We discuss the total mass and dark halo properties of the Small Magellanic
Cloud (SMC) for reasonable $V$-band stellar-to-mass-to-light ratios ($M_{\rm
s}/L_{\rm V}$) based on the high-resolution neutral hydrogen (HI) observations
of the SMC. We adopt both the Burkert and the NFW profiles for the dark matter
halo of the SMC in order to model the radial profile of the observed rotation
curve. We show that the mass ($M_{\rm dm}$) and the mean density (${\rho}_{\rm
dm}$) of the dark matter halo within the optical radius ($\sim 3$ kpc) of the
SMC can be significantly low for $M_{\rm s}/L_{\rm V}=2-4$ reasonable for a
galaxy dominated by older stellar populations. For example, the estimated
$M_{\rm dm}$ and ${\rho}_{\rm dm}$ are $7.5 \times 10^7 {\rm M}_{\odot}$ and
$6.7 \times 10^{-4} {\rm M}_{\odot}$ pc$^{-3}$, respectively, for $M_{\rm
s}/L_{\rm V} = 3.8$. The models with lower $M_{\rm s}/L_{\rm V}$ ($<1.0$) can
show higher $M_{\rm dm}$ and ${\rho}_{\rm dm}$ yet have difficulties in
reproducing the inner rotation curve profile both for the Burkert and the NFW
profiles. The Burkert profile with a larger core radius ($>1$ kpc) (thus a low
density) and a large mass (${\rm M}_{\rm dm} > 3 \times 10^9 {\rm M}_{\odot}$)
can be better fit to the observed slowly rising rotation curve than the NFW one
for a reasonable $M_{\rm s}/L_{\rm V} \sim2$. This means that most of the dark
halo mass can be initially located outside the optical radius in the SMC and
thus that the dark halo would have already lost a significant fraction of its
original mass due to the strong tidal interactions with the Galaxy and possibly
with the Large Magellanic Cloud (LMC).

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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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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: adap-org
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The categories of this paper are: chem-ph