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  The spatially resolved broad line region of IRAS 09149-6206

Amorim, A., Bauböck, M., Brandner, W., Clénet, Y., Davies, R., de Zeeuw, P. T., et al. (2020). The spatially resolved broad line region of IRAS 09149-6206. Astronomy and Astrophysics, 643: A154. doi:10.1051/0004-6361/202039067.

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Amorim, A., Author
Bauböck, M.1, Author              
Brandner, W., Author
Clénet, Y., Author
Davies, R.1, Author              
de Zeeuw, P. T.1, Author              
Dexter, J.1, Author              
Eckart, A.1, 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., Author
Hönig, S., Author
Kishimoto, M., Author
Lacour, S., Author
Lutz, D.1, Author              
Millour, F., Author
Netzer, H., AuthorOtt, T.1, Author              Paumard, T., AuthorPerraut, K., AuthorPerrin, G., AuthorPeterson, B. M., AuthorPetrucci, P. O., AuthorPfuhl, O., AuthorPrieto, M. A., AuthorRouan, D., AuthorShangguan, J.1, Author              Shimizu, T.2, Author              Schartmann, M.3, Author              Stadler, J.1, Author              Sternberg, A., AuthorStraub, O.1, Author              Straubmeier, C., AuthorSturm, E.1, Author              Tacconi, L. J.1, Author              Tristram, K. R. W., AuthorVermot, P., AuthorFellenberg, S. D. von1, Author              Waisberg, I., AuthorWidmann, F.1, Author              Woillez, J., Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
2Theory and Complex Plasmas, MPI for Extraterrestrial Physics, Max Planck Society, ou_159894              
3Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: We present new near-infrared VLTI/GRAVITY interferometric spectra that spatially resolve the broad Brγ emission line in the nucleus of the active galaxy IRAS 09149−6206. We use these data to measure the size of the broad line region (BLR) and estimate the mass of the central black hole. Using an improved phase calibration method that reduces the differential phase uncertainty to 0.05° per baseline across the spectrum, we detect a differential phase signal that reaches a maximum of ∼0.5° between the line and continuum. This represents an offset of ∼120 μas (0.14 pc) between the BLR and the centroid of the hot dust distribution traced by the 2.3 μm continuum. The offset is well within the dust sublimation region, which matches the measured ∼0.6 mas (0.7 pc) diameter of the continuum. A clear velocity gradient, almost perpendicular to the offset, is traced by the reconstructed photocentres of the spectral channels of the Brγ line. We infer the radius of the BLR to be ∼65 μas (0.075 pc), which is consistent with the radius–luminosity relation of nearby active galactic nuclei derived based on the time lag of the Hβ line from reverberation mapping campaigns. Our dynamical modelling indicates the black hole mass is ∼1 × 108 M, which is a little below, but consistent with, the standard MBH–σ* relation.

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Language(s): eng - English
 Dates: 2020-11-19
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202039067
Other: LOCALID: 3286387
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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: 643 Sequence Number: A154 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1