Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical parameters and classification of eight galactic nuclei from the
  Second Byurakan Survey   Spectroscopic observations with a resolution of 4.5 Angst were performed for
a sample of eight galactic nuclei extracted from the Second Byurakan Survey,
and one companion galaxy of SBS 1204+505B. The EW and FWHM of the emission
lines were measured, and useful line ratios and diagnostic diagrams were used
for object classification and reddening estimates.
  Intrinsic reddening quantities were calculated for all non QSO,i.e. seven
objects. Particularly the amount of reddening, BV color excess, extinction
coefficient and optical depths in the V band, at Halpha and Hbeta wavelengths,
and at 5100 Angst. The broad line region size was also estimated for seven
objects, as well as the central black hole masses. Three mass estimates were
usually performed for each object and compared. A peculiar line, probably He I
lambda 5048, is detected in the QSO SBS 1626+554. Evidence for a stratified
narrow line region is found for the two narrow line Seyfert 1 galaxies included
in the sample. A revised classification is proposed for two objects, and the
companion galaxy of SBS 1204+505B is reported as a nuclear starburst galaxy.

17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga