The SEDIGISM survey: First Data Release and overview of the Galactic structure

F. Schuller; J S Urquhart; T Csengeri; D. Colombo; Ana Duarte-Cabral; M Mattern; A Ginsburg; A R Pettitt; F. Wyrowski; David Eden

doi:10.1093/mnras/staa2369

The SEDIGISM survey: First Data Release and overview of the Galactic structure

F. Schuller, J S Urquhart, T Csengeri, D. Colombo, Ana Duarte-Cabral, M Mattern, A Ginsburg, A R Pettitt, F. Wyrowski, David Eden

Department of Physics

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71 Citations (SciVal)

Abstract

The SEDIGISM (Structure, Excitation and Dynamics of the Inner Galactic Interstellar Medium) survey used the APEX telescope to map 84 deg2 of the Galactic plane between ℓ = −60° and +31° in several molecular transitions, including 13CO (2 – 1) and C18O (2 – 1), thus probing the moderately dense (∼103 cm−3) component of the interstellar medium. With an angular resolution of 30 arcsec and a typical 1σ sensitivity of 0.8–1.0 K at 0.25 km s−1 velocity resolution, it gives access to a wide range of structures, from individual star-forming clumps to giant molecular clouds and complexes. The coverage includes a good fraction of the first and fourth Galactic quadrants, allowing us to constrain the large-scale distribution of cold molecular gas in the inner Galaxy. In this paper, we provide an updated overview of the full survey and the data reduction procedures used. We also assess the quality of these data and describe the data products that are being made publicly available as part of this First Data Release (DR1). We present integrated maps and position–velocity maps of the molecular gas and use these to investigate the correlation between the molecular gas and the large-scale structural features of the Milky Way such as the spiral arms, Galactic bar and Galactic Centre. We find that approximately 60 per cent of the molecular gas is associated with the spiral arms and these appear as strong intensity peaks in the derived Galactocentric distribution. We also find strong peaks in intensity at specific longitudes that correspond to the Galactic Centre and well-known star-forming complexes, revealing that the 13CO emission is concentrated in a small number of complexes rather than evenly distributed along spiral arms.

Original language	English
Pages (from-to)	3064–3082
Number of pages	19
Journal	Monthly Notices of the Royal Astronomical Society
Volume	500
Issue number	3
Early online date	11 Sept 2020
DOIs	https://doi.org/10.1093/mnras/staa2369
Publication status	Published - 31 Jan 2021

Data Availability Statement

The data presented in this paper is available from a dedicated website: https://sedigism.mpifr-bonn.mpg.de.

Funding

We thank the anonymous referee for their positive report and constructive comments. We are very grateful for the continuous support provided by the APEX staff. FS acknowledges support from a CEA/Marie Sklodowska-Curie Enhanced Eurotalents fellowship. ADC acknowledges support from the Royal Society University Research Fellowship URF/R1/191609. LB acknowledges support from CONICYT project Basal AFB-170002. HB acknowledges support from the European Research Council under the Horizon 2020 Framework Program via the ERC Consolidator Grant CSF-648505. HB also acknowledges support from the Deutsche Forschungsgemeinschaft (DFG) via Sonderforschungsbereich (SFB) 881 "The Milky Way System" (subproject B1). This work was partially funded by the Collaborative Research Council 956 "Conditions and impact of star formation" (subproject A6), also funded by the DFG. MW acknowledges funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 796461. TCs has received financial support from the French State in the framework of the IdEx Université de Bordeaux Investments for the future Program. CLD acknowledges funding from the European Research Council for the Horizon 2020 ERC consolidator grant project ICYBOB, grant number 818940. This document was prepared using the Overleaf web application, which can be found at www.overleaf.com. This publication is based on data acquired with the Atacama Pathfinder Experiment (APEX), projects 092.F-9315 and 193.C-0584. APEX is a collaboration between the Max-Planck-Institut für Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory.

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title = "The SEDIGISM survey: First Data Release and overview of the Galactic structure",

abstract = "The SEDIGISM (Structure, Excitation and Dynamics of the Inner Galactic Interstellar Medium) survey used the APEX telescope to map 84 deg2 of the Galactic plane between ℓ = −60° and +31° in several molecular transitions, including 13CO (2 – 1) and C18O (2 – 1), thus probing the moderately dense (∼103 cm−3) component of the interstellar medium. With an angular resolution of 30 arcsec and a typical 1σ sensitivity of 0.8–1.0 K at 0.25 km s−1 velocity resolution, it gives access to a wide range of structures, from individual star-forming clumps to giant molecular clouds and complexes. The coverage includes a good fraction of the first and fourth Galactic quadrants, allowing us to constrain the large-scale distribution of cold molecular gas in the inner Galaxy. In this paper, we provide an updated overview of the full survey and the data reduction procedures used. We also assess the quality of these data and describe the data products that are being made publicly available as part of this First Data Release (DR1). We present integrated maps and position–velocity maps of the molecular gas and use these to investigate the correlation between the molecular gas and the large-scale structural features of the Milky Way such as the spiral arms, Galactic bar and Galactic Centre. We find that approximately 60 per cent of the molecular gas is associated with the spiral arms and these appear as strong intensity peaks in the derived Galactocentric distribution. We also find strong peaks in intensity at specific longitudes that correspond to the Galactic Centre and well-known star-forming complexes, revealing that the 13CO emission is concentrated in a small number of complexes rather than evenly distributed along spiral arms.",

author = "F. Schuller and Urquhart, {J S} and T Csengeri and D. Colombo and Ana Duarte-Cabral and M Mattern and A Ginsburg and Pettitt, {A R} and F. Wyrowski and David Eden",

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AU - Duarte-Cabral, Ana

AU - Mattern, M

AU - Ginsburg, A

AU - Pettitt, A R

AU - Wyrowski, F.

AU - Eden, David

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AB - The SEDIGISM (Structure, Excitation and Dynamics of the Inner Galactic Interstellar Medium) survey used the APEX telescope to map 84 deg2 of the Galactic plane between ℓ = −60° and +31° in several molecular transitions, including 13CO (2 – 1) and C18O (2 – 1), thus probing the moderately dense (∼103 cm−3) component of the interstellar medium. With an angular resolution of 30 arcsec and a typical 1σ sensitivity of 0.8–1.0 K at 0.25 km s−1 velocity resolution, it gives access to a wide range of structures, from individual star-forming clumps to giant molecular clouds and complexes. The coverage includes a good fraction of the first and fourth Galactic quadrants, allowing us to constrain the large-scale distribution of cold molecular gas in the inner Galaxy. In this paper, we provide an updated overview of the full survey and the data reduction procedures used. We also assess the quality of these data and describe the data products that are being made publicly available as part of this First Data Release (DR1). We present integrated maps and position–velocity maps of the molecular gas and use these to investigate the correlation between the molecular gas and the large-scale structural features of the Milky Way such as the spiral arms, Galactic bar and Galactic Centre. We find that approximately 60 per cent of the molecular gas is associated with the spiral arms and these appear as strong intensity peaks in the derived Galactocentric distribution. We also find strong peaks in intensity at specific longitudes that correspond to the Galactic Centre and well-known star-forming complexes, revealing that the 13CO emission is concentrated in a small number of complexes rather than evenly distributed along spiral arms.

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DO - 10.1093/mnras/staa2369

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ER -

The SEDIGISM survey: First Data Release and overview of the Galactic structure

Abstract

Data Availability Statement

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