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The spatially resolved broad line region of IRAS 09149-6206

The spatially resolved broad line region of IRAS 09149-6206
The spatially resolved broad line region of IRAS 09149-6206
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* relation....
0004-6361
Collaboration, Gravity
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Amorim, A.
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Bauböck, M.
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Brandner, W.
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Clénet, Y.
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de Zeeuw, P. T.
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Dexter, J.
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Eckart, A.
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Eisenhauer, F.
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Förster Schreiber, N. M.
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Genzel, R.
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Gillessen, S.
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Gratadour, D.
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Hönig, S.
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Kishimoto, M.
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Lacour, S.
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Lutz, D.
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Millour, F.
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Netzer, H.
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Petrucci, P. O.
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Pfuhl, O.
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Prieto, M. A.
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Rouan, D.
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Shangguan, J.
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Shimizu, T.
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Schartmann, M.
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Stadler, J.
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Sternberg, A.
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Straub, O.
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Straubmeier, C.
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Sturm, E.
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Tacconi, L. J.
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Tristram, K. R. W.
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Vermot, P.
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von Fellenberg, S.
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Waisberg, I.
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Widmann, F.
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Woillez, J.
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Amorim, A.
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Bauböck, M.
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Brandner, W.
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Clénet, Y.
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de Zeeuw, P. T.
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Dexter, J.
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Eckart, A.
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Eisenhauer, F.
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Förster Schreiber, N. M.
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Garcia, P. J. V.
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Genzel, R.
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Gillessen, S.
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Gratadour, D.
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Hönig, S.
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Kishimoto, M.
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Lacour, S.
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Lutz, D.
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Millour, F.
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Netzer, H.
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Ott, T.
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Paumard, T.
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Perraut, K.
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Perrin, G.
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Peterson, B. M.
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Petrucci, P. O.
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Pfuhl, O.
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Prieto, M. A.
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Rouan, D.
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Shangguan, J.
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Shimizu, T.
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Schartmann, M.
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Stadler, J.
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Sternberg, A.
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Straub, O.
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Straubmeier, C.
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Sturm, E.
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Tacconi, L. J.
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Tristram, K. R. W.
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Vermot, P.
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von Fellenberg, S.
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Waisberg, I.
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Widmann, F.
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Woillez, J.
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Collaboration, Gravity, Amorim, A., Bauböck, M., Brandner, W., Clénet, Y., de Zeeuw, P. T., Dexter, J., Eckart, A., Eisenhauer, F., Förster Schreiber, N. M., 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., von Fellenberg, S., Waisberg, I., Widmann, F. and Woillez, J. (2020) The spatially resolved broad line region of IRAS 09149-6206. Astronomy and Astrophysics, [A154]. (doi:10.1051/0004-6361/202039067).

Record type: Article

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* relation....

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More information

Accepted/In Press date: 16 September 2020
Published date: November 2020

Identifiers

Local EPrints ID: 446881
URI: http://eprints.soton.ac.uk/id/eprint/446881
ISSN: 0004-6361
PURE UUID: df11d39e-dc76-4404-9b74-99cb36aef135

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Date deposited: 25 Feb 2021 17:30
Last modified: 26 Nov 2021 00:03

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Contributors

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

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