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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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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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 Rev. Type: -
 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