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.
radio lines: ISM
ISM: structure
Galaxy: kinematics and dynamics
surveys
Author
F. Schuller
Max Planck Society
European Southern Observatory Santiago
Leibniz Institute for Astrophysics Potsdam
J. S. Urquhart
University Of Kent
T. Csengeri
Max Planck Society
University of Bordeaux
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
J. Kauffmann
Massachusetts Institute of Technology (MIT)
S. Leurini
Istituto nazionale di astrofisica (INAF)
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
Grenoble Alpes University
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 3064-3082Subject Categories
Astronomy, Astrophysics and Cosmology
Other Chemistry Topics
Geophysics
DOI
10.1093/mnras/staa2369