Properties of Broad and Narrow Line Seyfert galaxies selected from SDSS

Abstract

A comparative study of a representative sample of Broad and Narrow line Seyfert galaxies is presented. These galaxies have been selected from the 16th data release of the Sloan Digital Sky Survey (SDSS-DR16). Some of the properties derived from single epoch spectrum vary significantly between the two populations. We find that the emission regions of Narrow line Seyfert galaxies are rich in iron content and the accretion rate is higher compared to the Broad line Seyfert galaxies. In our analysis, the H emission line is found to be asymmetric in few of the galaxies with more number of Narrow-line Seyfert 1 (NlSy1) galaxies showing blue asymmetries i.e. traces of outflowing gas as compared to the Broad-line Seyfert 1 (BlSy1) galaxies. This behaviour may be explained by the higher iron content present in the emission line regions of NlSy1 galaxies.