Molecular tracers of radiative feedback in Orion (OMC-1) Widespread CH ( = 1-0), CO (10-9), HCN (6-5), and HCO (6-5) emission.

Young massive stars regulate the physical conditions, ionization, and fate of their natal molecular cloud and surroundings. It is important to find tracers that help quantifying the stellar feedback processes that take place at different spatial scales. We present ~85 arcmin (~1.

High-speed molecular cloudlets around the Galactic center's supermassive black hole.

We present 1″-resolution ALMA observations of the circumnuclear disk (CND) and the interstellar environment around Sgr A*. The images unveil the presence of small spatial scale CO (=3-2) molecular "cloudlets" (≲20,000 AU size) within the central parsec of the Milky Way, in other words, inside the cavity of the CND, and moving at high speeds, up to 300 km s along the line-of-sight. The CO-emitting structures show intricate morphologies: extended and filamentary at high negative-velocities (v ≲-150 km s), more localized and clumpy at extreme positive-velocities (v ≳+200 km s).