The spatially resolved broad line region of IRAS 09149-6206

Amorim, A.; Bauböck, M.; Brandner, W.; Clénet, Y.; Davies, R.; de Zeeuw, P. T.; Dexter, J.; Eckart, A.; Eisenhauer, F.; Förster Schreiber, N. M.; Gao, F.; Garcia, P. J. V.; Genzel, R.; Gillessen, S.; Gratadour, D.; Hönig, S.; Kishimoto, M.; Lacour, S.; Lutz, D.; Millour, F.; Netzer, H.; Ott, T.; Paumard, T.; Perraut, K.; Perrin, G.; Peterson, B. M.; Petrucci, P. O.; Pfuhl, O.; Prieto, M. A.; Rouan, D.; Shangguan, J.; Shimizu, T.; Schartmann, M.; Stadler, J.; Sternberg, A.; Straub, O.; Straubmeier, C.; Sturm, E.; Tacconi, L. J.; Tristram, K. R. W.; Vermot, P.; Fellenberg, S. D. von; Waisberg, I.; Widmann, F.; Woillez, J.

doi:10.1051/0004-6361/202039067

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The spatially resolved broad line region of IRAS 09149-6206

MPG-Autoren

/persons/resource/persons216131

Bauböck, M.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons208361

Davies, R.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons225865

de Zeeuw, P. T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons146381

Dexter, J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons23001

Eckart, A.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4766

Eisenhauer, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4923

Förster Schreiber, N. M.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons214427

Gao, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4590

Genzel, R.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4768

Gillessen, S.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4584

Lutz, D.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons16190

Ott, T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons232571

Shangguan, J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons16202

Shimizu, T.
Theory and Complex Plasmas, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4598

Schartmann, M.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons248280

Stadler, J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons232635

Straub, O.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4650

Sturm, E.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4582

Tacconi, L. J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons206120

Fellenberg, S. D. von
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons214431

Widmann, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Zitation

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.

Zitierlink: https://hdl.handle.net/21.11116/0000-0007-FDDB-6

Zusammenfassung

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 M_BH–σ* relation.