![]() ![]() ![]() However, the present view of AGN is much more complex. According to this theory, most of the amount of obscuring material mainly resides in the torus, which is also solely responsible for AGN classification. What is certain, as demonstrated by deep X-ray observations, is that most SMBHs at galaxy centres grow become increasingly hidden by dust and gas (see e.g., Hickox & Alexander 2018 for a review).Īt small scales closer to the SMBH, the standard, simplistic scenario of the AGN unified model ( Antonucci 1993) is now outdated. Although the AGN-host galaxy co-evolution scenario is widely accepted and supported by clear observational evidence ( Kormendy & Ho 2013 Heckman & Best 2014), there are still some issues to be addressed, mostly regarding AGN feedback (e.g., Fabian 2012). One of the most important results recently provided is the connection between the super massive black hole (SMBH) that powers the AGN and the host galaxy, that is, the so-called feeding and feedback cycle of active galaxies. In the past decades, the science of active galactic nuclei (AGN) has made great progress that has led to a deep knowledge of both their population in the sky and the physical mechanisms responsible for their emission over the entire electromagnetic spectrum. Subscribe to A&A to support open access publication. This article is published in open access under the Subscribe to Open model. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 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. 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. 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. 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. 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. ![]() 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. We have collected 83 new AGN, increasing the number of INTEGRAL-detected active galaxies (436) by 19%. 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. School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK IAPS-Roma, Via Fosso del Cavaliere 100, 00133 Roma, Italy Instituto de Astrofísica, Facultad de Ciencias Exactas, Universidad Andrés Bello, Fernández Concha 700, Las Condes, Santiago RM, Chile Gobetti 101, 40129 Bologna, Via Corti 12, 20133 Milano, Italy Astronomical objects: linking to databasesĪ.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes
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