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

被引：338

作者：

Abuter, R. ^{[10
]}

Amorim, A. ^{[6
,7
]}

Bauboeeck, M. ^{[1
]}

Berger, J. P. ^{[5
]}

Bonnet, H. ^{[10
]}

Brandner, W. ^{[3
]}

Clenet, Y. ^{[2
]}

du Foresto, V. Coude ^{[3
]}

de Zeeuw, P. T. ^{[1
,12
]}

Dexter, J. ^{[1
]}

Duvert, G. ^{[5
]}

Eckart, A. ^{[4
,16
]}

Eisenhauer, F. ^{[1
]}

Schreiber, N. M. Foeerster ^{[1
]}

Garcia, P. ^{[8
,9
]}

Gao, F. ^{[1
]}

Gendron, E. ^{[2
]}

Genzel, R. ^{[1
,13
,14
]}

Gerhard, O. ^{[1
]}

Gillessen, S. ^{[1
]}

Habibi, M. ^{[1
]}

Haubois, X. ^{[11
]}

Henning, T. ^{[3
]}

Hippler, S. ^{[3
]}

Horrobin, M. ^{[4
]}

Jimenez-Rosales, A. ^{[1
]}

Jocou, L. ^{[5
]}

Kervella, P. ^{[2
]}

Lacour, S. ^{[1
,2
]}

Lapeyrere, V ^{[2
]}

Le Bouquin, J-B ^{[5
]}

Lena, P. ^{[2
]}

Ott, T. ^{[1
]}

Paumard, T. ^{[2
]}

Perraut, K. ^{[5
]}

Perrin, G. ^{[2
]}

Pfuhl, O. ^{[1
]}

Rabien, S. ^{[1
]}

Coira, G. Rodriguez ^{[2
]}

Rousset, G. ^{[2
]}

Scheithauer, S. ^{[3
]}

Sternberg, A. ^{[15
,17
]}

Straub, O. ^{[1
]}

Straubmeier, C. ^{[4
]}

Sturm, E. ^{[1
]}

Tacconi, L. J. ^{[1
]}

Vincent, F. ^{[2
]}

von Fellenberg, S. ^{[1
]}

Waisberg, I ^{[1
]}

Widmann, F. ^{[1
]}

机构：

[1] Max Planck Inst Extraterr Phys MPE, Giessenbachstr 1, D-85748 Garching, Germany

[2] UPMC Univ Paris 06, Observ Paris, PSL Res Univ,LESIA, CNRS,Sorbonne Univ,Univ Paris Diderot,Sorbonne Pa, F-92195 Meudon, France

[3] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[4] Univ Cologne, Phys Inst, Zulpicher Str 77, D-50937 Cologne, Germany

[5] Univ Grenoble Alpes, IPAG, CNRS, F-38000 Grenoble, France

[6] CENTRA, P-1749016 Lisbon, Portugal

[7] Univ Lisbon, Fac Ciencias, P-1749016 Lisbon, Portugal

[8] CENTRA, P-4200465 Porto, Portugal

[9] Univ Porto, Fac Engn, P-4200465 Porto, Portugal

[10] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[11] European Southern Observ, Santiago 19001 19, Chile

[12] Leiden Univ, Sterrewacht Leiden, Postbus 9513, NL-2300 RA Leiden, Netherlands

[13] Univ Calif Berkeley, Dept Phys, Le Conte Hall, Berkeley, CA 94720 USA

[14] Univ Calif Berkeley, Dept Astron, Le Conte Hall, Berkeley, CA 94720 USA

[15] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[16] Max Planck Inst Radio Astron, Auf Dem Hugel 69, D-53121 Bonn, Germany

[17] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 625卷

关键词：

black hole physics; astrometry; Galaxy: nucleus; SGR A-ASTERISK; MONITORING STELLAR ORBITS; NEAR-INFRARED FLARES; STAR S2; MOTION; GALAXY; LINES; MASS; EMISSION;

D O I：

10.1051/0004-6361/201935656

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：10

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