N. F. Förster Schreiber

MUSE-ALMA Haloes XVI: a census of the condensed baryons in z~0.5 HI absorption-selected galaxies

We use the MUSE-ALMA Haloes sample to build a census of the condensed baryons (stars and cold gas) to study the multiphase interstellar medium and circumgalactic medium (CGM). The sample includes 79 gas-rich galaxies at 0.2<z<1.2 located near strong HI Ly-alpha absorbers along quasar sightlines within projected separat...

MUSE-ALMA Haloes XV. Cold molecular, ionised, and stellar kinematics of HI-rich galaxies at z ∼ 0 . 5

Discovery of a star sensitive to the spin of Sagittarius A*

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...

GRAVITY+ at the VLTI: instrumental advances enabling high-angular-resolution AGN science

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...