Residing in the centre of the Milky Way, Sagittarius A* (Sgr A*) is the closest massive black hole1 (MBH). Its vicinity has allowed measuring individual stellar orbits around it2, 3–4. The stars act as test particles and probe the gravitational potential around the 4.3 × 106M⊙ MBH. These observations have determined th...
K. A. El Dayem, R. Abuter, N. Aimar et al.· Nature· 1 citation
We present an overview of how recent and upcoming GRAVITY+ upgrades at the VLTI interconnect instrument and science, enabling high-angular-resolution studies of active galactic nuclei (AGN). Improvements such as wideangle off-axis fringe tracking, enhanced fringe-tracker performance, and state-of-the-art adaptive optic...
S. Pappert, Yi-Xian Cao, R. Davies et al.· Astronomical Telescopes + In...· 1 citation
Laser guide star (LGS) adaptive optics has become widespread in ground-based astronomy. It is also the most promising approach for countering atmospheric distortions in uplink optical satellite communications and laser-based space debris tracking and maneuvering. The best performance is achieved when the LGS is created...
Konstantin B. Holzner, Christopher Renkl, M. Brekenfeld et al.· Astronomical Telescopes + In...· 2 citations
GRAVITY+ is an upgrade of the VLTI infrastructure, providing unprecedented spatial resolution and sensitivity. One of the project's objectives was to replace the low-order NGS SCAO systems with four high-order AO modules incorporated in the Coudé train of each VLT UT: GRAVITY+ Adaptive Optics (GPAO). This paper present...
S. Oberti, J. Kolb, A. Berdeu et al.· Astronomical Telescopes + In...· 1 citation
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