Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Estimating non-circular motions in barred galaxies using numerical
  N-body simulations   The observed velocities of the gas in barred galaxies are a combination of
the azimuthally-averaged circular velocity and non-circular motions, primarily
caused by gas streaming along the bar. These non-circular flows must be
accounted for before the observed velocities can be used in mass modeling. In
this work, we examine the performance of the tilted-ring method and the DiskFit
algorithm for transforming velocity maps of barred spiral galaxies into
rotation curves (RCs) using simulated data. We find that the tilted-ring
method, which does not account for streaming motions, under/over-estimates the
circular motions when the bar is parallel/perpendicular to the projected major
axis. DiskFit, which does include streaming motions, is limited to orientations
where the bar is not-aligned with either the major or minor axis of the image.
Therefore, we propose a method of correcting RCs based on numerical simulations
of galaxies. We correct the RC derived from the tilted-ring method based on a
numerical simulation of a galaxy with similar properties and projections as the
observed galaxy. Using observations of NGC 3319, which has a bar aligned with
the major axis, as a test case, we show that the inferred mass models from the
uncorrected and corrected RCs are significantly different. These results show
the importance of correcting for the non-circular motions and demonstrate that
new methods of accounting for these motions are necessary as current methods
fail for specific bar alignments.

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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: chao-dyn