Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The consequences of ram pressure stripping on the Virgo cluster spiral
  galaxy NGC 4522   New H-alpha Fabry-Perot interferometer observations of the Virgo cluster
spiral galaxy NGC 4522 are presented. A velocity field up to a radius of 60''
was obtained. The observed rotation curve is symmetric. It is not perturbed in
the inner disk. For radii >50'' it shows a solid body rotation. We compare
these data with a numerical model which includes the effects of ram pressure
stripping. The model can reproduce the main characteristics of the H-alpha
emission distribution and velocity field. We therefore conclude that the
stripping event which caused the HI deficiency and the distorted H-alpha
distribution and velocity field has been due to ram pressure. The closest
passage of the galaxy to the cluster center is estimated to be approx. 6.5 10^8
yr ago. The observed recent star formation is due to the re-accretion of gas
clouds which were accelerated to velocities below the escape velocity during
the stripping event. Furthermore, the gas which is located at radii >60'' is
part of an asymmetric expanding ring of gas clouds. A substantial part of these
clouds is located above the disk plane. We predict the HI gas distribution and
velocity field as it would be observed by deep 21 cm observations.

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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: hep-lat
3
The categories of this paper are: physics