Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation of the parameters of spiral pattern in galaxies: the arm
  width   In this work we determine the parameters of spiral structure for a sample of
face-on spiral galaxies. In practice, the solution of this problem is a hard
task because of the diversity of the observed characteristics of spiral
structure, such as the arm number, their shape, arm contrast etc. In this work
we study spiral structure in galaxies based on an analysis of photometric cuts
perpendicular to the arm direction. The method is based on an approximation of
these slices with an analytical function and derivation of the parameters of
spiral structure (arm width, asymmetry, pitch angle) using the fitted
parameters of this approximation. The algorithm has been applied to a sample of
155 galaxies selected from the Sloan Digital Sky Survey in different passbands.
In this paper we only consider the results on the arm width: most spirals show
an increase of their width with galactocentric distance. Only 14 per cent of
galaxies in our sample show an opposite trend or have an almost constant arm
width at all radii.

29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
9
The categories of this paper are: nlin