Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematics of the faintest gas rich galaxy in the Local Group: DDO210   We present deep, high velocity resolution (~1.6 km/s) Giant Meterwave Radio
Telescope (GMRT) HI 21cm synthesis images of the faint (M_B ~ -10.6) local
group dwarf galaxy DDO210. We find that the HI distribution in the galaxy is
not axi-symmetric, but shows density enhancements in the eastern and southern
halves of the galaxy. The optical emission is lopsided with respect to the HI,
most of the bright optical emission arises from the eastern half of the HI
disk. The velocity field of the galaxy is however quite regular and shows a
systematic large scale pattern, consistent with the rotational motion. The
rotation curve for the galaxy shows a peak (inclination corrected) rotation
velocity of only ~8 km/s, comparable to the random motions in the HI gas. After
correcting for the dynamical support provided by random motions (the
``asymmetric drift'' correction), we find the corrected peak rotation velocity
of ~16.0 km/s. Mass modeling of the corrected rotation curve shows that the
kinematics of DDO210 can be well fit with either a modified isothermal halo
(with a central density rho_0 ~ 29 X 10^{-3} M_\odot pc^{-3} for a stellar mass
to light ratio of 3.4) or an NFW halo. In the case of the NFW halo however, a
good fit is obtained for a wide range of parameters; the halo parameters could
not be uniquely determined from the fit. Density profiles with inner slope
steeper than ~1.2 however provide a poor fit to the data. Finally, the rotation
curve derived using MOND also provides a reasonable fit to the observed
rotation curve.

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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: quant-ph