Active galactic nuclei: what's in a name?

P Padovani, DM Alexander, RJ Assef… - The Astronomy and …, 2017 - Springer
Active galactic nuclei (AGN) are energetic astrophysical sources powered by accretion onto
supermassive black holes in galaxies, and present unique observational signatures that …

Revisiting the unified model of active galactic nuclei

H Netzer - Annual Review of Astronomy and Astrophysics, 2015 - annualreviews.org
This review describes recent developments related to the unified model of active galactic
nuclei (AGNs). It focuses on new ideas about the origin and properties of the central …

Nuclear obscuration in active galactic nuclei

CR Almeida, C Ricci - Nature Astronomy, 2017 - nature.com
The material surrounding accreting supermassive black holes connects the active galactic
nucleus with its host galaxy and, besides being responsible for feeding the black hole …

Live to die another day: the rebrightening of AT 2018fyk as a repeating partial tidal disruption event

T Wevers, ER Coughlin, DR Pasham… - The Astrophysical …, 2023 - iopscience.iop.org
Stars that interact with supermassive black holes (SMBHs) can be either completely or
partially destroyed by tides. In a partial tidal disruption event (TDE), the high-density core of …

The dust covering factor in active galactic nuclei

M Stalevski, C Ricci, Y Ueda, P Lira… - Monthly Notices of the …, 2016 - academic.oup.com
The primary source of emission of active galactic nuclei (AGNs), the accretion disc, is
surrounded by an optically and geometrically thick dusty structure ('the so-called dusty …

The incidence of obscuration in active galactic nuclei

A Merloni, A Bongiorno, M Brusa… - Monthly Notices of …, 2014 - academic.oup.com
We study the incidence of nuclear obscuration on a complete sample of 1310 active galactic
nuclei (AGN) selected on the basis of their rest-frame 2–10 keV X-ray flux from the XMM …

Half of the most luminous quasars may be obscured: investigating the nature of WISE-selected hot dust-obscured galaxies

RJ Assef, PRM Eisenhardt, D Stern… - The Astrophysical …, 2015 - iopscience.iop.org
HALF OF THE MOST LUMINOUS QUASARS MAY BE OBSCURED: INVESTIGATING THE
NATURE OF WISE-SELECTED HOT DUST-OBSCURED GALAXIES - IOPscience Skip to content …

New spectral model for constraining torus covering factors from broadband X-ray spectra of active galactic nuclei

M Baloković, M Brightman, FA Harrison… - The Astrophysical …, 2018 - iopscience.iop.org
The basic unified model of active galactic nuclei (AGNs) invokes an anisotropic obscuring
structure, usually referred to as a torus, to explain AGN obscuration as an angle-dependent …

Infrared Echoes of Optical Tidal Disruption Events:∼ 1% Dust-covering Factor or Less at Subparsec Scale

N Jiang, T Wang, X Hu, L Sun, L Dou… - The Astrophysical …, 2021 - iopscience.iop.org
The past decade has experienced an explosive increase of optically discovered tidal
disruption events (TDEs) with the advent of modern time-domain surveys. However, we still …

The obscured fraction of active galactic nuclei in the XMM-COSMOS survey: a spectral energy distribution perspective

E Lusso, JF Hennawi, A Comastri… - The Astrophysical …, 2013 - iopscience.iop.org
The fraction of active galactic nucleus (AGN) luminosity obscured by dust and re-emitted in
the mid-IR is critical for understanding AGN evolution, unification, and parsec-scale AGN …