Structure, Excitation and Dynamics of the Inner Galactic Interstellar Medium

Survey Description

This web page is designed to provide access to the SEDIGISM (Structure, Excitation and Dynamics of the Inner Galactic Interstellar Medium) survey database which houses all of processed survey data and auxiliary data products. This survey is a large scale (84 deg2) spectroscopic survey of the inner Galactic disc (see grey shaded region of the left panel of figure below). The main target lines are the 13CO(2-1) and C18O(2-1) transitions, which have a much lower optical depth than that of the more commonly observed 12CO(1-0) transition. Therefore, they are well suited to trace the moderately dense (n ~ 103 cm-3) molecular gas in the Galactic ISM. The data also cover transitions from other molecules (SO, SiO, HNCO...), typically found in higher density regions, and can be used to probe their physical conditions.

Coverage and Integrated 13CO (2-1) Emission Map

With an angular resolution of 30'' and a 1-sigma sensitivity usually below 1.0 K at 0.25 km s-1 velocity resolution, this survey provides a detailed view of interstellar matter over a wide range of scales, from individual star-forming clumps to giant molecular clouds and complexes.

The data were acquired with the APEX telescope between 2013 and 2016, and have been processed with the GILDAS software. The links below provide access to the data products that form the first public data release (DR1). Any publication (partially) based on SEDIGISM data should refer to the following paper: Schuller et al. (2021).

For more details see the press release and accompanying movie of the survey data.

Project Resources

Survey Data Products and Publications

Reference and Acknowledgments

A detailed description of the SEDIGISM survey and overview of the results is given in Schuller et al. (2021). Please reference this paper in any publication that makes use of SEDIGISM data. In addition, any publication making use of the GMC catalogue, cloud masks, or medial axis tables, please reference Duarte-Cabral et al. (2021).

Please include the following acknowledgement in any published material that makes use of the SEDIGISM Database or any of its data products:

This paper made use of information from the SEDIGISM survey database located at, which was constructed by James Urquhart and hosted by the Max Planck Institute for Radio Astronomy.

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