Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Keplerian rotation of our Galaxy?   It is common to attribute a flat rotation curve to our Galaxy. However
Galazutdinov et al. (2015) in a recent paper have obtained a Keplerian rotation
curve for interstellar clouds in outer parts of the Galaxy. They have
calculated the distances from equivalent widths of interstellar CaII lines. The
radial velocity was also measured on the interstellar CaII absorption line.
  We verify the result by Galazutdinov et al. (2015) basing on observations of
old open clusters. We propose, that the observations of flat and Keplerian
rotation curves may be caused by the assumption of circular orbits. The
application of formulas derived with the assumption of circular orbits to
elliptical ones may mimics the flat rotation curve. The interstellar clouds
with cross-sections larger than stars may have almost circular orbits, and the
derived rotation curve will be Keplerian.

17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex