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The resolved size and structure of hot dust in the immediate vicinity of AGN

The resolved size and structure of hot dust in the immediate vicinity of AGN
The resolved size and structure of hot dust in the immediate vicinity of AGN
We use VLTI/GRAVITY near-infrared interferometry measurements of eight bright type 1 AGN to study the size and structure of hot dust that is heated by the central engine. We partially resolve each source, and report Gaussian full width at half-maximum sizes in the range 0.3−0.8 mas. In all but one object, we find no evidence for significant elongation or asymmetry (closure phases ≲1°). The narrow range of measured angular sizes is expected given the similar optical flux of our targets, and implies an increasing effective physical radius with bolometric luminosity, as found from previous reverberation and interferometry measurements. The measured sizes for Seyfert galaxies are systematically larger than for the two quasars in our sample when measured relative to the previously reported R ∼ L1/2 relationship, which is explained by emission at the sublimation radius. This could be evidence of an evolving near-infrared emission region structure as a function of central luminosity.
Galaxies: Seyfert, Galaxies: active, Galaxies: nuclei, Quasars: general, Techniques: interferometric
0004-6361
Dexter, J.
57732356-ffc4-4e17-9bac-e208721eed50
Shangguan, J.
67b7af5b-2321-47bb-809d-f611ba02af7e
Hoenig, Sebastian
be0bb8bc-bdac-4442-8edc-f735834f3917
GRAVITY Collaboration
Dexter, J.
57732356-ffc4-4e17-9bac-e208721eed50
Shangguan, J.
67b7af5b-2321-47bb-809d-f611ba02af7e
Hoenig, Sebastian
be0bb8bc-bdac-4442-8edc-f735834f3917

Dexter, J., Shangguan, J. and Hoenig, Sebastian , GRAVITY Collaboration (2020) The resolved size and structure of hot dust in the immediate vicinity of AGN. Astronomy & Astrophysics, 635, [A92]. (doi:10.1051/0004-6361/201936767).

Record type: Article

Abstract

We use VLTI/GRAVITY near-infrared interferometry measurements of eight bright type 1 AGN to study the size and structure of hot dust that is heated by the central engine. We partially resolve each source, and report Gaussian full width at half-maximum sizes in the range 0.3−0.8 mas. In all but one object, we find no evidence for significant elongation or asymmetry (closure phases ≲1°). The narrow range of measured angular sizes is expected given the similar optical flux of our targets, and implies an increasing effective physical radius with bolometric luminosity, as found from previous reverberation and interferometry measurements. The measured sizes for Seyfert galaxies are systematically larger than for the two quasars in our sample when measured relative to the previously reported R ∼ L1/2 relationship, which is explained by emission at the sublimation radius. This could be evidence of an evolving near-infrared emission region structure as a function of central luminosity.

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More information

Accepted/In Press date: 16 January 2020
Published date: 20 March 2020
Keywords: Galaxies: Seyfert, Galaxies: active, Galaxies: nuclei, Quasars: general, Techniques: interferometric

Identifiers

Local EPrints ID: 442604
URI: http://eprints.soton.ac.uk/id/eprint/442604
ISSN: 0004-6361
PURE UUID: 561da7d3-89c9-43c1-a129-ae1c9bac2b0c

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Date deposited: 21 Jul 2020 16:30
Last modified: 21 Nov 2021 20:45

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Contributors

Author: J. Dexter
Author: J. Shangguan
Corporate Author: GRAVITY Collaboration

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