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

Dexter, J., Shangguan, J., Hönig, S., Kishimoto, M., Lutz, D., Netzer, H., et al. (2020). The resolved size and structure of hot dust in the immediate vicinity of AGN. Astronomy and Astrophysics, 635: A92. doi:10.1051/0004-6361/201936767.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-7AC8-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-7AC9-F
Genre: Journal Article

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Dexter, J.1, Author              
Shangguan, J.1, Author              
Hönig, S., Author
Kishimoto, M., Author
Lutz, D.1, Author              
Netzer, H., Author
Davies, R.1, Author              
Sturm, E.1, Author              
Pfuhl, O.1, Author              
Amorim, A., Author
Bauböck, M.1, Author              
Brandner, W., Author
Clénet, Y., Author
de Zeeuw, P. T.1, Author              
Eckart, A., Author
Eisenhauer, F.1, Author              
Förster-Schreiber, N. M.1, Author              
Gao, F.1, Author              
Garcia, P. J. V., Author
Genzel, R.1, Author              
Gillessen, S.1, Author              Gratadour, D., AuthorJiménez-Rosales, A.1, Author              Lacour, S.1, Author              Millour, F., AuthorOtt, T.1, Author              Paumard, T., AuthorPerraut, K., AuthorPerrin, G., AuthorPeterson, B. M., AuthorPetrucci, P. O., AuthorPrieto, M. A., AuthorRouan, D., AuthorSchartmann, M.2, Author              Shimizu, T.1, Author              Sternberg, A., AuthorStraub, O.1, Author              Straubmeier, C., AuthorTacconi, L. J.1, Author              Tristram, K., AuthorVermot, P., AuthorWaisberg, I., AuthorWidmann, F.1, Author              Woillez, J., Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
2Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 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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 Dates: 2020-03-13
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1051/0004-6361/201936767
Other: LOCALID: 3235781
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 635 Sequence Number: A92 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1