Image Details
Caption: Figure 1.
(Top) Stations in the 870 μm fringe test. (Bottom) Zenith opacity at 225 GHz, which is the standard frequency used for monitoring millimeter-wave conditions. The observing window on each day is indicated by the green shading. Conditions at ALMA were very good during both days (τ 225 ≈ 0.05). The black lines indicate the opacity at each site calculated using inputs from MERRA-2 reanalysis during the observing windows, which we use to estimate 870 μm (345 GHz) opacity. Opacities for APEX and NOEMA have been estimated by converting precipitable water vapor column amounts.
© 2024. The Author(s). Published by the American Astronomical Society.