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The origin of radio emission from radio-quiet active galactic nuclei

The origin of radio emission from radio-quiet active galactic nuclei
The origin of radio emission from radio-quiet active galactic nuclei

The central nuclei of galaxies, where supermassive black holes (SMBHs) are thought to reside, can experience phases of activity when they become active galactic nuclei (AGNs). An AGN can eject winds and jets and produce radiation across the entire electromagnetic spectrum. The fraction of the bolometric emission in the radio spans a factor of approximately 10 5 across the different classes of AGNs. The weakest radio sources, radio-quiet (RQ) AGNs, are typically 1,000 times fainter than the radio-loud (RL) AGNs, and represent the majority of the AGN population. In RQ AGNs, the absence of luminous jets allows us to probe radio emission from a wide range of possible mechanisms: star formation, AGN-driven wind, free-free emission from photoionized gas, low-power jets and the innermost accretion disk coronal activity. All these mechanisms can now be probed with unprecedented precision and spatial resolution, owing to the current and forthcoming generation of highly sensitive radio arrays.

2397-3366
387-396
Panessa, Francesca
faf8fa94-5348-4c39-8b0f-fae3075f469a
Baldi, Ranieri Diego
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Laor, Ari
c05ad4c1-3fb4-465a-ab9e-8928b410043c
Padovani, Paolo
8d1fd6b6-7450-437c-acc3-75ea9c3563a2
Behar, Ehud
04fd38d9-e172-4ae9-a530-9418b301e041
McHardy, Ian
4f215137-9cc4-4a08-982e-772a0b24c17e
Panessa, Francesca
faf8fa94-5348-4c39-8b0f-fae3075f469a
Baldi, Ranieri Diego
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Laor, Ari
c05ad4c1-3fb4-465a-ab9e-8928b410043c
Padovani, Paolo
8d1fd6b6-7450-437c-acc3-75ea9c3563a2
Behar, Ehud
04fd38d9-e172-4ae9-a530-9418b301e041
McHardy, Ian
4f215137-9cc4-4a08-982e-772a0b24c17e

Panessa, Francesca, Baldi, Ranieri Diego, Laor, Ari, Padovani, Paolo, Behar, Ehud and McHardy, Ian (2019) The origin of radio emission from radio-quiet active galactic nuclei. Nature Astronomy, 3 (5), 387-396. (doi:10.1038/s41550-019-0765-4).

Record type: Article

Abstract

The central nuclei of galaxies, where supermassive black holes (SMBHs) are thought to reside, can experience phases of activity when they become active galactic nuclei (AGNs). An AGN can eject winds and jets and produce radiation across the entire electromagnetic spectrum. The fraction of the bolometric emission in the radio spans a factor of approximately 10 5 across the different classes of AGNs. The weakest radio sources, radio-quiet (RQ) AGNs, are typically 1,000 times fainter than the radio-loud (RL) AGNs, and represent the majority of the AGN population. In RQ AGNs, the absence of luminous jets allows us to probe radio emission from a wide range of possible mechanisms: star formation, AGN-driven wind, free-free emission from photoionized gas, low-power jets and the innermost accretion disk coronal activity. All these mechanisms can now be probed with unprecedented precision and spatial resolution, owing to the current and forthcoming generation of highly sensitive radio arrays.

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The origin of radio emission from radio-quiet active galactic nuclei - Accepted Manuscript
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Accepted/In Press date: 19 March 2019
e-pub ahead of print date: 29 April 2019
Published date: 29 April 2019
Additional Information: arXiv is AM

Identifiers

Local EPrints ID: 431667
URI: http://eprints.soton.ac.uk/id/eprint/431667
ISSN: 2397-3366
PURE UUID: 107e1b98-3986-4b9b-8f7e-d6e75a3b1878

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Date deposited: 12 Jun 2019 16:30
Last modified: 17 Dec 2019 05:01

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Contributors

Author: Francesca Panessa
Author: Ari Laor
Author: Paolo Padovani
Author: Ehud Behar
Author: Ian McHardy

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