M. Bauböck

TL;DR: Eisenhauer et al. as mentioned in this paper detect the combined gravitational redshift and relativistic transverse Doppler effect for S2 of z = Δλ / λ ≈ 200 km s−1/c with different statistical analysis methods.

TL;DR: In this article, the authors detect the combined gravitational redshift and relativistic transverse Doppler effect for S2 of z ~ 200 km/s / c with different statistical analysis methods.

TL;DR: In this paper, the authors presented a 0.16% precise and 0.27% accurate determination of R 0, the distance to the Galactic center using the star S2 on its 16-year orbit around the massive black hole Sgr A* that they followed astrometrically and spectroscopically for 27 years.

TL;DR: The first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*), the Galactic center source associated with a supermassive black hole, were conducted in 2017 using a global interferometric array of eight telescopes operating at a wavelength of 1.3 mm as mentioned in this paper .

TL;DR: In this article, the position centroids exhibit clockwise looped motion on the sky, on scales of typically 150 μ as over a few tens of minutes, corresponding to about 30% the speed of light.