Norbert Hubin

TL;DR: Ten years of high-resolution astrometric imaging allow us to trace two-thirds of the orbit of the star currently closest to the compact radio source (and massive black-hole candidate) Sagittarius A* and show that the star is on a bound, highly elliptical keplerian orbit around Sgr A*.

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 paper, the authors reported on 75 mas resolution, near-IR imaging spectroscopy within the central 30 lt-days of the Galactic center, taken with the new adaptive optics-assisted integral field spectrometer SINFONI on the ESO VLT.

TL;DR: The SPHERE instrument as discussed by the authors was designed for direct detection and spectral characterization of extra-solar planets, where the main challenge consists in the very large contrast between the host star and the planet, typically inside the seeing halo.

TL;DR: In this paper, a 75 milli-arcsec resolution, near-IR imaging spectroscopy within the central 30 light days of the Galactic Center is reported. But the spectral properties of the S-stars are not co-aligned with those of the two disks of massive young stars 1-10 arcsec from SgrA.