The SEDIGISM survey: First Data Release and overview of the Galactic structure
Journal article, 2021

The SEDIGISM (Structure, Excitation and Dynamics of the Inner Galactic InterstellarMedium) survey used the APEX telescope to map 84 deg(2) of the Galactic plane between l = -60 degrees and +31 degrees in several molecular transitions, including (CO)-C-13(2 - 1) and (CO)-O-18(2 - 1), thus probing the moderately dense (similar to 10(3) cm(-3)) component of the interstellar medium. With an angular resolution of 30 arcsec and a typical 1 sigma sensitivity of 0.8-1.0K 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.

Galaxy: kinematics and dynamics

surveys

ISM: structure

radio lines: ISM

Author

F. Schuller

European Southern Observatory Santiago

Max Planck Society

Leibniz Institute for Astrophysics Potsdam

J. S. Urquhart

University Of Kent

T. Csengeri

University of Bordeaux

Max Planck Society

D. Colombo

Max Planck Society

A. Duarte-Cabral

Cardiff University

M. Mattern

Max Planck Society

A. Ginsburg

University of Florida

A. R. Pettitt

Hokkaido University

F. Wyrowski

Max Planck Society

L. Anderson

West Virginia University

F. Azagra

European Southern Observatory Santiago

P. Barnes

Space Science Institute

M. Beltran

Arcetri Astrophysical Observatory

H. Beuther

Max Planck Society

S. Billington

University Of Kent

L. Bronfman

University of Chile (UCH)

R. Cesaroni

Arcetri Astrophysical Observatory

C. Dobbs

University of Exeter

D. Eden

Liverpool John Moores University

M-Y Lee

Korea Astronomy and Space Science Institute

S-N X. Medina

Max Planck Society

K. M. Menten

Max Planck Society

T. Moore

Liverpool John Moores University

F. M. Montenegro-Montes

European Southern Observatory Santiago

S. Ragan

Cardiff University

A. Rigby

Cardiff University

M. Riener

Max Planck Society

D. Russeil

Aix Marseille University

E. Schisano

Istituto nazionale di astrofisica (INAF)

A. Sanchez-Monge

University of Cologne

A. Traficante

Istituto nazionale di astrofisica (INAF)

A. Zavagno

Aix Marseille University

C. Agurto

European Southern Observatory Santiago

S. Bontemps

University of Bordeaux

R. Finger

University of Chile (UCH)

A. Giannetti

Istituto nazionale di astrofisica (INAF)

E. Gonzalez

European Southern Observatory Santiago

A. K. Hernandez

University of Wisconsin Madison

T. Henning

Max Planck Society

Jouni Kainulainen

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

J. Kauffmann

Massachusetts Institute of Technology (MIT)

S. Leurini

INAF Osservatorio Astronomico di Cagliari

S. Lopez

University of Florida

F. Mac-Auliffe

European Southern Observatory Santiago

P. Mazumdar

Max Planck Society

S. Molinari

Istituto nazionale di astrofisica (INAF)

F. Motte

Université Grenoble Alpes

E. Muller

Macquarie University

Q. Nguyen-Luong

McMaster University

R. Parra

European Southern Observatory Santiago

J-P Perez-Beaupuits

European Southern Observatory Santiago

P. Schilke

University of Cologne

N. Schneider

University of Cologne

S. Suri

University of Cologne

L. Testi

European Southern Observatory Santiago

K. Torstensson

European Southern Observatory Santiago

V. S. Veena

University of Cologne

P. Venegas

European Southern Observatory Santiago

K. Wang

Beijing University of Technology

M. Wienen

University of Exeter

Max Planck Society

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 500 3 3064-3082

Subject Categories

Astronomy, Astrophysics and Cosmology

Other Chemistry Topics

Geophysics

DOI

10.1093/mnras/staa2369

More information

Latest update

2/8/2021 2