Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modelling the spectra of galaxies at redshift 0.4<z<1.15: the gas
  physical conditions and the element abundances   We revisit the spectra observed by Ramos Almeida et al. (2013) from an
homogeneous sample of galaxies at 0.27<z<1.28 with the aim of finding out the
characteristics of the single objects by consistent modelling. In particular we
investigate the trend of the most significant physical parameters and of the
element abundances with redshift. The observed corrected line ratios cover a
relatively large range. Nevertheless the calculated physical conditions are
similar to those of active galactic nuclei and of starburst galaxies. For some
of the galaxies the dominant photoionizing source is ambiguous. The N/H and O/H
relative abundances are close to the solar ones but show a dip at z=0.7.

23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
18
The categories of this paper are: econ
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc