This data release presents the first instalment of the SEDIGISM (Structure, Excitation and Dynamics of the Inner Galactic Interstellar Medium) survey, a large spectroscopic programme mapping molecular gas across the inner Milky Way. The survey was conducted with the APEX 12-m telescope between 2013 and 2017 and covers approximately 84 deg² of the southern Galactic plane, with continuous coverage from −60° ≤ l ≤ +17° at |b| ≤ 0.5°. Additional regions extend the latitude coverage (e.g. towards the Central Molecular Zone, RCW 120, and the Nessie filament) and include a dedicated 2 deg² field around W43 for cross-comparison with northern surveys.
Release of the SEDIGISM Survey
Published: 25 Sep 2025
The primary data products are spectral cubes of the 13CO(2–1) and C18O(2–1) lines, complemented by additional transitions such as CH3OH, H2CO, HC3N, HNCO, SiO, SO2, and SO. In total, 78 calibrated FITS cubes are provided, each covering about 2° × 1° with 1° overlap, 30″ angular resolution, and 0.25 km/s velocity resolution (0.5 km/s for ancillary lines). The release comprises approximately 2 TB of calibrated data, enabling studies of cloud structures, chemistry, kinematics, and the large-scale distribution of molecular gas in the Galaxy. Users can query and download the data using the ESO Archive Science Portal or programmatic access.
The DOI assigned to this data collection is 10.18727/archive/102, and further details are available in the release description.