Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accurate Parameters of the Mass Distribution in Spiral Galaxies: 1.
  Fabry - Perot Observations of NGC 5585   Using the example of the Sd galaxy NGC 5585, it is shown that high resolution
2-D HII kinematical data are necessary to determine accurately the parameters
of the mass distribution in spirals. New CFHT Fabry-Perot Halpha observations
are combined with low resolution (20") Westerbork HI data to study its mass
distribution. Using the combined rotation curve and best fit models, it can be
seen that M/L of the luminous disk goes from 0.3 using only the HI rotation
curve, to 0.8 using both the optical and the radio data. This reduces the
dark-to-luminous mass ratio in NGC 5585 by ~30% through increasing the dark
matter halo core radius by nearly the same amount. This shows the importance of
the inner, rising part of the rotation curve for the accurate determination of
the parameters of the global mass (luminous & dark) distribution and suggests
that such a fine tuning of the rotation velocities using high resolution 2-D
HII kinematics is necessary to look at correlations between the parameters of
the dark matter component and other properties of galaxies.

28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
7
The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph