Nuclear obscuration in active galactic nuclei

@article{Almeida2017NuclearOI,
  title={Nuclear obscuration in active galactic nuclei},
  author={Cristina Ramos Almeida and Claudio Ricci},
  journal={Nature Astronomy},
  year={2017},
  volume={1},
  pages={679-689}
}
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, provides important information on the feedback that nuclear activity produces on the galaxy. In this Review, we summarize our current understanding of the close environment of accreting supermassive black holes obtained from studies of local active galactic nuclei carried out in the infrared and X-ray regimes. The… Expand

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References

SHOWING 1-10 OF 179 REFERENCES
A direct image of the obscuring disk surrounding an active galactic nucleus
Active galactic nuclei (AGN) are generally accepted to be powered by the release of gravitational energy in a compact accretion disk surrounding a massive black hole,; such disks are also thoughtExpand
Obscuring Material around Seyfert Nuclei with Starbursts
The structure of obscuring matter in the environment of active galactic nuclei with associated nuclear starbursts is investigated using three-dimensional hydrodynamical simulations. Simple analyticalExpand
The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colour
We simulate the growth of galaxies and their central supermassive black holes by implementing a suite of semi-analytic models on the output of the Millennium Run, a very large simulation of theExpand
Radiation-driven Fountain and Origin of Torus around Active Galactic Nuclei
We propose a plausible mechanism to explain the formation of the so-called obscuring tori around active galactic nuclei (AGNs) based on three-dimensional hydrodynamic simulations including radiativeExpand
Compton thick active galactic nuclei in Chandra surveys
We present the results from an X-ray spectral analysis of active galactic nuclei (AGN) in the Chandra Deep Field-South, AEGIS-XD and Chandra-COSMOS surveys, fo- cussing on the identication andExpand
Molecular gas streamers feeding and obscuring the active nucleus of NGC 1068
We report the first direct observations of neutral, molecular gas streaming in the nucleus of NGC 1068 on scales of <30 pc using SINFONI near-infrared integral field spectroscopy. At a resolution ofExpand
Dusty winds in active galactic nuclei: reconciling observations with models
This letter presents a revised radiative transfer model for the infrared (IR) emission of active galactic nuclei (AGN). While current models assume that the IR is emitted from a dusty torus in theExpand
Dusty winds in active galactic nuclei: reconciling observations with models
This letter presents a revised radiative transfer model for the infrared (IR) emission of active galactic nuclei (AGN). While current models assume that the IR is emitted from a dusty torus in theExpand
The AGN-obscuring Torus: The End of the ``Doughnut'' Paradigm?
Unified schemes of active galactic nuclei (AGNs) require an obscuring dusty torus around the central engine. The compact sizes (only a few parsecs) determined in recent high-resolution observationsExpand
The dusty torus in the Circinus galaxy: a dense disk and the torus funnel
Context. With infrared interferometry it is possible to resolve the nuclear dust distributions that are commonly associated with the dusty torus in active galactic nuclei (AGN). The Circinus galaxyExpand
...
1
2
3
4
5
...