SEDIGISM-ATLASGAL: Dense gas fraction and star formation efficiency across the Galactic disc
Artikel i vetenskaplig tidskrift, 2021
By combining two surveys covering a large fraction of the molecular material in the Galactic disc, we investigate the role spiral arms play in the star formation process. We have matched clumps identified by APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) with their parental giant molecular clouds (GMCs) as identified by SEDIGISM, and use these GMC masses, the bolometric luminosities, and integrated clump masses obtained in a concurrent paper to estimate the dense gas fractions (DGFgmc = ΣMclump/Mgmc) and the instantaneous star formation efficiencies (i.e. SFEgmc = ΣLclump/Mgmc). We find that the molecular material associated with ATLASGAL clumps is concentrated in the spiral arms (∼60 per cent found within ±10 km s-1 of an arm).We have searched for variations in the values of these physical parameters with respect to their proximity to the spiral arms, but find no evidence for any enhancement that might be attributable to the spiral arms. The combined results from a number of similar studies based on different surveys indicate that, while spiral-arm location plays a role in cloud formation and HI to H2 conversion, the subsequent star formation processes appear to depend more on local environment effects. This leads us to conclude that the enhanced star formation activity seen towards the spiral arms is the result of source crowding rather than the consequence of any physical process.
Stars: Formation
Surveys
Galaxy: Kinematics and dynamics
ISM: Clouds
Submillimetre: ISM
Galaxy: Structure
Författare
J. S. Urquhart
University Of Kent
C. Figura
Wartburg College
J. R. Cross
University Of Kent
M. Wells
University Of Kent
T. J.T. Moore
Liverpool John Moores University
D. J. Eden
Liverpool John Moores University
S. E. Ragan
Cardiff University
A. R. Pettitt
Hokkaido University
A. Duarte-Cabral
Cardiff University
D. Colombo
Max-Planck-Gesellschaft
F. Schuller
Max-Planck-Gesellschaft
Leibniz-Institut Für Astrophysik Potsdam
T. Csengeri
Université de Bordeaux
M. Mattern
Max-Planck-Gesellschaft
Université Paris-Saclay
H. Beuther
Max-Planck-Gesellschaft
K. M. Menten
Max-Planck-Gesellschaft
F. Wyrowski
Max-Planck-Gesellschaft
L. D. Anderson
West Virginia University
P. J. Barnes
Space Science Institute
M. Beltrán
Osservatorio Astrofisico di Arcetri
S. J. Billington
University Of Kent
Leonardo Bronfman
Universidad de Chile (UCH)
A. Giannetti
Istituto di Radioastronomia
Jouni Kainulainen
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
J. Kauffmann
Massachusetts Institute of Technology (MIT)
M. Y. Lee
Korea Astronomy and Space Science Institute
S. Leurini
Istituto nazionale di astrofisica (INAF)
S. N.X. Medina
Max-Planck-Gesellschaft
F.M. Montenegro-Montes
European Southern Observatory Santiago
Manuel Riener
Max-Planck-Gesellschaft
Andrew Rigby
Cardiff University
A. Sanchez-Monge
Universität zu Köln
P. Schilke
Universität zu Köln
E. Schisano
Istituto nazionale di astrofisica (INAF)
A. Traficante
Istituto nazionale di astrofisica (INAF)
M. Wienen
University of Exeter
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 500 3 3050-3063Ämneskategorier
Astronomi, astrofysik och kosmologi
Kemiska processer
Annan kemi
DOI
10.1093/mnras/staa2512