The INTEGRAL/IBIS AGN catalogue: an update

TL;DR

This paper updates the INTEGRAL/IBIS AGN catalogue by adding 107 new high-energy AGN, providing precise X-ray and optical identifications, spectral analyses, and variability insights for a comprehensive understanding of these sources.

Contribution

The study presents the first detailed spectral analysis and optical characterization of 107 new AGN in the INTEGRAL/IBIS catalogue, enhancing the accuracy and completeness of high-energy AGN data.

Findings

107 new AGN identified and characterized

Spectral analysis performed on 52 sources for the first time

Detected flux variability in multiple energy bands

Abstract

In the most recent IBIS survey based on observations performed during the first 1000 orbits of INTEGRAL, are listed 363 high energy emitters firmly associated with AGN, 107 of which are reported here for the first time. We have used X-ray data to image the IBIS 90% error circle of all the AGN in the sample of 107, in order to obtain the correct X-ray counterparts, locate them with arcsec accuracy and therefore pinpoint the correct optical counterparts. This procedure has led to the optical and spectral characterization of the entire sample. This new set consists of 34 broad line or type 1 AGN, 47 narrow line or type 2 AGN, 18 Blazars and 8 sources of unknown class. These 8 sources have been associated with AGN from their positional coincidence with 2MASX/Radio/X-ray sources. Seven high energy emitters have been included since they are considered to be good AGN candidates. Spectral analysis has been already performed on 55 objects and the results from the most recent and/or best statistical measurements have been collected. For the remaining 52 sources, we report the spectral analysis for the first time in this work. We have been able to obtain the full X-ray coverage of the sample making use of data from Swift/XRT, XMM-Newton and NuSTAR. In addition to the spectral characterization of the entire sample, this analysis has enabled us to identify peculiar sources and by comparing different datasets, highlight flux variability in the 2-10 keV and 20-40 keV bands.