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Parsec-scale dusty winds in active galactic nuclei: Evidence for radiation pressure driving

Parsec-scale dusty winds in active galactic nuclei: Evidence for radiation pressure driving
Parsec-scale dusty winds in active galactic nuclei: Evidence for radiation pressure driving
Infrared interferometry of the local active galactic nucleus (AGN) has revealed a warm (~300–400 K) polar dust structure that cannot be trivially explained by the putative dust torus of the unified model. This led to the development of the disk+wind scenario which comprises a hot (~1000 K) compact equatorial dust disk and a polar dust wind. This wind is assumed to be driven by radiation pressure and, therefore, we would expect that long-term variation in radiation pressure would influence the dust distribution. In this paper we attempt to quantify if and how the dust distribution changes with radiation pressure. We analyze so far unpublished Very Large Telescope Interferometer (VLTI)/MID-infrared Interferometer (MIDI) data on 8 AGN and use previous results on 25 more to create a sample of 33 AGN. This sample comprises all AGN successfully observed with VLTI/MIDI. For each AGN, we calculate the Eddington ratio, using the intrinsic 2–10 keV X-ray luminosity and black hole mass, and compare this to the resolved dust emission fraction as seen by MIDI. We tentatively conclude that there is more dust in the wind at higher Eddington ratios, at least in type 2 AGN where such an effect is expected to be more easily visible.
0004-637X
Leftley, James
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Hoenig, Sebastian
be0bb8bc-bdac-4442-8edc-f735834f3917
Asmus, Daniel
f783516a-c74c-4912-b68e-4e896e4317b2
Tristram, Konrad R.W.
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Gandhi, Poshak
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Kishimoto, Makoto
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Venanzi, Marta
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Williamson, David
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Leftley, James
4eb054bd-32d4-428d-8979-84f3b3854785
Hoenig, Sebastian
be0bb8bc-bdac-4442-8edc-f735834f3917
Asmus, Daniel
f783516a-c74c-4912-b68e-4e896e4317b2
Tristram, Konrad R.W.
37fab926-5cfc-4c23-8f75-52fafaa518b6
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Kishimoto, Makoto
ffd0231d-af4a-467e-b693-82905e0ca7f3
Venanzi, Marta
3f4e3e23-62a1-4654-8860-25a3228d7470
Williamson, David
140b2434-b216-4237-8a78-9950b01319b5

Leftley, James, Hoenig, Sebastian, Asmus, Daniel, Tristram, Konrad R.W., Gandhi, Poshak, Kishimoto, Makoto, Venanzi, Marta and Williamson, David (2019) Parsec-scale dusty winds in active galactic nuclei: Evidence for radiation pressure driving. The Astrophysical Journal, 886 (1), [55]. (doi:10.3847/1538-4357/ab4a0b).

Record type: Article

Abstract

Infrared interferometry of the local active galactic nucleus (AGN) has revealed a warm (~300–400 K) polar dust structure that cannot be trivially explained by the putative dust torus of the unified model. This led to the development of the disk+wind scenario which comprises a hot (~1000 K) compact equatorial dust disk and a polar dust wind. This wind is assumed to be driven by radiation pressure and, therefore, we would expect that long-term variation in radiation pressure would influence the dust distribution. In this paper we attempt to quantify if and how the dust distribution changes with radiation pressure. We analyze so far unpublished Very Large Telescope Interferometer (VLTI)/MID-infrared Interferometer (MIDI) data on 8 AGN and use previous results on 25 more to create a sample of 33 AGN. This sample comprises all AGN successfully observed with VLTI/MIDI. For each AGN, we calculate the Eddington ratio, using the intrinsic 2–10 keV X-ray luminosity and black hole mass, and compare this to the resolved dust emission fraction as seen by MIDI. We tentatively conclude that there is more dust in the wind at higher Eddington ratios, at least in type 2 AGN where such an effect is expected to be more easily visible.

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Parsec-scale Dusty Winds in Active Galactic Nuclei- Evidence for Radiation Pressure Driving - Accepted Manuscript
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Accepted/In Press date: 30 September 2019
e-pub ahead of print date: 19 November 2019
Additional Information: arxiv is am

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Local EPrints ID: 437012
URI: http://eprints.soton.ac.uk/id/eprint/437012
ISSN: 0004-637X
PURE UUID: 473d889d-b367-4dc2-98e9-6e41fdba49a7
ORCID for James Leftley: ORCID iD orcid.org/0000-0001-6009-1803
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615
ORCID for David Williamson: ORCID iD orcid.org/0000-0002-5168-7979

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Date deposited: 15 Jan 2020 17:30
Last modified: 07 Oct 2020 02:14

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Contributors

Author: James Leftley ORCID iD
Author: Daniel Asmus
Author: Konrad R.W. Tristram
Author: Poshak Gandhi ORCID iD
Author: Makoto Kishimoto
Author: Marta Venanzi

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