Universität zu Köln

Abuter, R., Amorim, A., Bauboeeck, M., Berger, J. P., Bonnet, H., Brandner, W., Clenet, Y., du Foresto, V. Coude, de Zeeuw, P. T., Dexter, J., Duvert, G., Eckart, A., Eisenhauer, F., Schreiber, N. M. Foeerster, Garcia, P., Gao, F., Gendron, E., Genzel, R., Gerhard, O., Gillessen, S., Habibi, M., Haubois, X., Henning, T., Hippler, S., Horrobin, M., Jimenez-Rosales, A., Jocou, L., Kervella, P., Lacour, S., Lapeyrere, V, Le Bouquin, J-B, Lena, P., Ott, T., Paumard, T., Perraut, K., Perrin, G., Pfuhl, O., Rabien, S., Coira, G. Rodriguez, Rousset, G., Scheithauer, S., Sternberg, A., Straub, O., Straubmeier, C., Sturm, E., Tacconi, L. J., Vincent, F., von Fellenberg, S., Waisberg, I, Widmann, F., Wieprecht, E., Wiezorrek, E., Woillez, J. and Yazici, S. (2019). A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty. Astron. Astrophys., 625. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present a 0.16% precise and 0.27% accurate determination of R-0, 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 mu as 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 R-0 = 8178 +/- 13(stat.) +/- 22(sys.) 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 20 sigma with f(redshift) = 1.04 +/- 0.05.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Abuter, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Amorim, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bauboeeck, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Berger, J. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bonnet, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brandner, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clenet, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED du Foresto, V. Coude UNSPECIFIED UNSPECIFIED UNSPECIFIED de Zeeuw, P. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dexter, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Duvert, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eisenhauer, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schreiber, N. M. Foeerster UNSPECIFIED UNSPECIFIED UNSPECIFIED Garcia, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gao, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gendron, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Genzel, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerhard, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gillessen, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Habibi, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Haubois, X. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henning, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hippler, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Horrobin, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jimenez-Rosales, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jocou, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kervella, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lacour, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lapeyrere, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Le Bouquin, J-B UNSPECIFIED UNSPECIFIED UNSPECIFIED Lena, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ott, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paumard, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Perraut, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Perrin, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pfuhl, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rabien, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Coira, G. Rodriguez UNSPECIFIED UNSPECIFIED UNSPECIFIED Rousset, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scheithauer, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sternberg, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Straub, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Straubmeier, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sturm, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tacconi, L. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vincent, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED von Fellenberg, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Waisberg, I UNSPECIFIED UNSPECIFIED UNSPECIFIED Widmann, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wieprecht, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wiezorrek, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Woillez, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yazici, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-148061
DOI:	10.1051/0004-6361/201935656
Journal or Publication Title:	Astron. Astrophys.
Volume:	625
Date:	2019
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SGR A-ASTERISK; MONITORING STELLAR ORBITS; NEAR-INFRARED FLARES; STAR S2; MOTION; GALAXY; LINES; MASS; EMISSION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14806