X-Ray Spectral Parameters for a Sample of 95 Active Galactic Nuclei

TL;DR

This study provides a comprehensive X-ray spectral analysis of 95 AGN, revealing correlations among spectral parameters and differences between Seyfert types, supporting aspects of the AGN Unified Model.

Contribution

First homogeneous broadband X-ray spectral analysis of 95 AGN from Swift/BAT, jointly using XMM-Newton and INTEGRAL data, with detailed parameter correlations and Seyfert type comparisons.

Findings

Seyfert 2 galaxies show higher reflection parameters than Seyfert 1.

Weak anticorrelation between Fe Kα equivalent width and luminosity.

No significant deviations from the AGN Unified Model found.

Abstract

We present a broadband X-ray analysis of a new homogeneous sample of 95 active galactic nuclei (AGN) from the 22-month Swift/BAT all-sky survey. For this sample we treated jointly the X-ray spectra observed by XMM-Newton and INTEGRAL missions for the total spectral range of 0.5-250 keV. Photon index \Gamma, relative reflection R, equivalent width of Fe $K_{\alpha}$ line (EW Fe $K_{\alpha}$), hydrogen column density $N_{H}$, exponential cut-off energy $E_{c}$ and intrinsic luminosity $L_{corr}$ are determined for all objects of the sample. We investigated correlations \Gamma - R, EW Fe $K_{\alpha}$ - $L_{corr}$, \Gamma - $E_{c}$, EW Fe $K_{\alpha}$ - $N_{H}$. Dependence \Gamma - R for Seyfert 1 and 2 type of galaxies has been investigated separately. We found that the relative reflection parameter at low power-law indexes for Seyfert 2 galaxies is systematically higher than for Seyfert 1 ones. This can be related to an increasing contribution of the reflected radiation from the gas-dust torus. Our data show that there exists some anticorrelation between EW Fe $K_{\alpha}$ and $L_{corr}$, but it is not strong. We have not found statistically significant deviations from the AGN Unified Model.