The flux ratio of the [N II]$\lambda\lambda$ 6548, 6583 \AA\ lines in
  sample of Active Galactic Nuclei Type 2
  In spectra of the Active Galactic Nuclei (AGNs), the [N II] 6548, 6583 A
lines are commonly fitted using the fixed intensity ratio of these two lines
(R[N II]=I$_{6583}$/I$_{6548}$). However, the used values for fixed intensity
ratio are slightly different through literature. There are several theoretical
calculations of the transition probabilities which can be used for the line
ratio estimation, but there are no experimental measurements of this ratio,
since the [N II] lines are extremely weak in laboratory plasma. Therefore, the
intensity ratio of [N II] lines can be measured only in the spectra of
astrophysical objects. However, precise and systematic measurements have not be
done so far, because of difficulties in measurement of the [N II] ratio in
various spectra (overlapping with H$\alpha$, weak intensity of [N II],
influence of the continuum noise and outflow contribution, etc.). Here we
present the measurements of the flux ratio of the [N II]$\lambda\lambda$ 6548,
6583 A emission lines for a sample of 250 Type 2 AGNs spectra taken form Sloan
Digital Sky Survey (SDSS) data base. The spectra are chosen to have high
signal-to-noise ratio and to [N II] and H$\alpha$ lines do not overlap. The
obtained mean flux ratio from measurements is 3.049 $\pm$ 0.021. Our result is
in agreement with theoretical result obtained by taking into account the
relativistic corrections to the magnetic dipole operator.
