Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Redshifts and age of stellar systems of distant radio galaxies from
  multicolour photometry data   Using all the data available in the literature on colour characteristics of
host galaxies associated with distant (z>1) radio galaxies, a possibility has
been investigated of using two evolutionary models of stellar systems (PEGASE
and Poggianti) to evaluate readshifts and ages of stellar systems in these
galaxies. Recommendations for their applications are given.

19
The categories of this paper are: eess
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics