SIMBAD references

In the present work we analyse the influence of gravitational field on the profile of spectral lines. For kinematically very composite regions near nuclei of Seyfert galaxies and quasars both the optically thin and optically thick cases have been considered. We suppose that the line profile without gravitational field influence (undisturbed profile) is a Voigt one. Irrespective of any other (mostly Doppler) influence the gravitational one yields shifted and asymmetric, and under the assumption of optically thin region, broadened spectral lines. The blue wing of the deformed spectral line is lower, while the red one is higher than in the undisturbed line profile. In the case of optically thin region we have discussed the shape of spectral lines for different wavelength ranges.