X-ray selected Narrow-Line Seyfert 1 Galaxies

TL;DR

This study analyzes X-ray selected Narrow-Line Seyfert 1 and Broad-Line Seyfert 1 galaxies, revealing correlations between their X-ray spectral properties and physical parameters like black hole mass and Eddington ratio.

Contribution

It provides a complete sample and comparative analysis of NLS1 and BLS1 galaxies, highlighting key differences and correlations in their X-ray and physical properties.

Findings

Photon-index correlates with Eddington ratio

Weaker correlation between photon index and black-hole mass

NLS1 and BLS1 show distinct X-ray spectral behaviors

Abstract

We present and discuss the properties of a complete and well defined sample of X-ray selected type 1 AGNs including 26 Narrow-Line Seyfert 1 and 129 Broad-Line Seyfert 1 galaxies derived from the XMM-Newton Bright Serendipitous Survey (XBS). We study the differences between the two classes of AGNs for what concerns the X-ray properties (the photon-index) and the main physical parameters, like the Black-Hole mass and the Eddington ratio. We then consider the two classes together and look for statistical correlations between observed and physical parameters. We find a significant dependence of the photon-index with the Eddington ratio and a weaker (possibly secondary) correlation between the photon index and the Black-Hole Mass.