| Issue |
A&A
Volume 671, March 2023
|
|
|---|---|---|
| Article Number | A152 | |
| Number of page(s) | 15 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/202245495 | |
| Published online | 17 March 2023 | |
Update of the INTEGRAL/IBIS active galactic nuclei catalogue: Deeper on the Galactic plane and wider beyond
1
OAS-Bologna, Via P. Gobetti 101, 40129 Bologna, Italyangela.malizia@inaf.it
e-mail: angela.malizia@inaf.it
2
IASF-Milano, Via Corti 12, 20133 Milano, Italy
3
Instituto de Astrofísica, Facultad de Ciencias Exactas, Universidad Andrés Bello, Fernández Concha 700, Las Condes, Santiago RM, Chile
4
IAPS-Roma, Via Fosso del Cavaliere 100, 00133 Roma, Italy
5
School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK
Received:
18
November
2022
Accepted:
23
January
2023
In this work we have updated the list of active galactic nuclei (AGN) detected by INTEGRAL taking into account the new objects listed in the last published INTEGRAL/IBIS survey. We have collected 83 new AGN, increasing the number of INTEGRAL-detected active galaxies (436) by 19%. Half of these new additions are located behind the Galactic plane, and for most of them we have full X-ray coverage, obtained through archival data from Swift/XRT, XMM-Newton, and NuSTAR. The soft X-ray data allowed us to associate each high-energy emitter with a single or multiple X-ray counterpart(s) and characterise the spectral shape of these new AGN by estimating the photon index, the intrinsic absorption, and the 2–10 keV flux. A few cases where two soft X-ray counterparts fall within the INTEGRAL error circle and at least one is classified as an AGN have been found and discussed in detail. Thirty-four sources originally listed as AGN candidates or unidentified objects have been recognised as AGN by employing three diagnostic tests: WISE colours, radio emission, and morphology. For 12 sources among the 34 AGN candidates, we reduced the optical spectra and confirmed their AGN nature, providing also their optical class and redshift. This paper is part of an ongoing effort to keep the INTEGRAL AGN catalogue updated in order to provide the scientific community with a hard X-ray selected sample of well-classified and spectrally characterised active galaxies.
Key words: X-rays: galaxies / gamma rays: galaxies / galaxies: active / galaxies: Seyfert
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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