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  A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty

Amorim, A., Bauböck, M., Berger, J. P., Bonnet, H., Brandner, W., Clénet, Y., et al. (2019). A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty. Astronomy and Astrophysics, 625: L10. doi:10.1051/0004-6361/201935656.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-C28F-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-C290-E
Genre: Journal Article

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Amorim, A., Author
Bauböck, M.1, Author              
Berger, J. P., Author
Bonnet, H., Author
Brandner, W., Author
Clénet, Y., Author
du Foresto, V. Coudé, Author
de Zeeuw, P. T.1, Author              
Dexter, J.1, Author              
Duvert, G., Author
Eckart, A., Author
Eisenhauer, F.1, Author              
Förster Schreiber, N. M.1, Author              
Garcia, P., Author
Gao, F.1, Author              
Gendron, E., Author
Genzel, R.1, Author              
Gerhard, O.2, Author              
Gillessen, S.1, Author              
Habibi, M.1, Author              
Haubois, X., AuthorHenning, T., AuthorHippler, S., AuthorHorrobin, M., AuthorJiménez Rosales, A.1, Author              Jocou, L., AuthorKervella, P., AuthorLacour, S.1, Author              Lapeyrère, V., AuthorLe Bouquin, J.-B., AuthorLéna, P., AuthorOtt, T.1, Author              Paumard, T., AuthorPerraut, K., AuthorPerrin, G., AuthorPfuhl, O.1, Author              Rabien, S.1, Author              Coira, G. Rodriguez, AuthorRousset, G., AuthorScheithauer, S., AuthorSternberg, A., AuthorStraub, O.1, Author              Straubmeier, C., AuthorSturm, E.1, Author              Tacconi, L. J.1, Author              Vincent, F., AuthorFellenberg, S. von1, Author              Waisberg, I.1, Author              Widmann, F.1, Author              Wieprecht, E.1, Author              Wiezorrek, E.1, Author              Woillez, J., AuthorYazici, S.1, 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 present a 0.16% precise and 0.27% accurate determination of R0, the distance to the Galactic center. Our measurement uses the star S2 on its 16-year orbit around the massive black hole Sgr A* that we followed astrometrically and spectroscopically for 27 years. Since 2017, we added near-infrared interferometry with the VLTI beam combiner GRAVITY, yielding a direct measurement of the separation vector between S2 and Sgr A* with an accuracy as good as 20 μas in the best cases. S2 passed the pericenter of its highly eccentric orbit in May 2018, and we followed the passage with dense sampling throughout the year. Together with our spectroscopy, in the best cases with an error of 7 km s−1, this yields a geometric distance estimate of R0 = 8178 ± 13stat. ± 22sys. pc. This work updates our previous publication, in which we reported the first detection of the gravitational redshift in the S2 data. The redshift term is now detected with a significance level of 20σ with fredshift = 1.04 ± 0.05.

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 Dates: 2019-05-20
 Publication Status: Published online
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 Rev. Method: -
 Identifiers: DOI: 10.1051/0004-6361/201935656
Other: LOCALID: 3067269
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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: 625 Sequence Number: L10 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1