Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The density profile and the wavelength dependence of compact radio
  source size   In the gaseous disk model, the density profile is derived from the mass and
energy conservation in the gravitational field of a central energy source.
Using the condition for emission, following from the induced character of
radiation process, we obtain the wavelength dependence of radio source size
which is consistent with observational data.

11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga