The Narrow-Line Region of Narrow-Line Seyfert 1 Galaxies

TL;DR

This study investigates the physical properties of narrow-line Seyfert 1 galaxies, revealing their relation to non-active galaxies, identifying outflows, and linking black hole characteristics with emission-line region parameters.

Contribution

It provides new insights into the kinematics and physical conditions of NLS1 galaxies, including their placement on the M_BH-sigma relation and outflow phenomena.

Findings

NLS1 galaxies follow the non-active galaxy M_BH-sigma relation after removing outliers.

Identification of 'blue outliers' with significant outflow velocities.

New correlations between black hole mass, Eddington ratio, and emission-line region properties.

Abstract

We have studied the physical properties of a sample of narrow-line Seyfert 1 (NLS1) galaxies, and present a summary of our previous results, and new results. In particular, we have previously shown that (1) the locus of NLS1 galaxies on the M_BH-sigma_[OIII] plane does follow the relation of non-active galaxies after removing objects obviously dominated by outflows as evidenced by their [OIII] core blueshifts. We have (2) identified a number of so-called 'blue outliers' with large outflow velocities revealed by their emission-line kinematic shifts. We also (3) present new correlations and trends which link black hole mass, Eddington ratio and physical parameters of the emission-line regions.