2019A&A...625L..10G

Query : 2019A&A...625L..10G

2019A&A...625L..10G - Astronomy and Astrophysics, volume 625L10-10 (2019/5-1)

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

GRAVITY COLLABORATION, ABUTER R., AMORIM A., BAUBOCK M., BERGER J.P., BONNET H., BRANDNER W., CLENET Y., COUDE DU FORESTO V., DE ZEEUW P.T., DEXTER J., DUVERT G., ECKART A., EISENHAUER F., FORSTER SCHREIBER N.M., 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., RODRIGUEZ-COIRA G., 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.

Abstract (from CDS):

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 20µas 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 7km/s, 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.

Abstract Copyright: © R. Abuter et al. 2019

Journal keyword(s): black hole physics - astrometry - Galaxy: nucleus

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
2 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
3 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
4 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
5 [EG97] S2 * 17 45 40.0442 -29 00 27.975           B0/2V 420 1
6 NAME Galactic Bar reg ~ ~           ~ 1458 0

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