Urquhart, J. S., Figura, C., Cross, J. R., Wells, M. R. A., Moore, T. J. T., Eden, D. J., Ragan, S. E., Pettitt, A. R., Duarte-Cabral, A., Colombo, D., Schuller, E., Csengeri, T., Mattern, M., Beuther, H., Menten, K. M., Wyrowski, F., Anderson, L. D., Barnes, P. J., Beltran, M. T., Billington, S. J., Bronfman, L., Giannetti, A., Kainulainen, J., Kauffmann, J., Lee, M-Y, Leurini, S., Medina, S-N X., Montenegro-Montes, F. M., Riener, M., Rigby, A. J., Sanchez-Monge, A., Schilke, P., Schisano, E., Traficante, A. and Wieneri, M. (2021). SEDIGISM-ATLASGAL: dense gas fraction and star formation efficiency across the Galactic disc. Mon. Not. Roy. Astron. Soc., 500 (3). S. 3050 - 3064. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

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 (DGF(gmc) = Sigma M-clump/M-gmc) and the instantaneous star formation efficiencies (i.e. SFEgmc = Sigma L-clump/M-gmc). We find that the molecular material associated with ATLASGAL clumps is concentrated in the spiral arms (similar to 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 H-2 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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Urquhart, J. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Figura, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cross, J. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wells, M. R. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moore, T. J. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eden, D. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ragan, S. E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pettitt, A. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Duarte-Cabral, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Colombo, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schuller, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csengeri, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mattern, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beuther, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wyrowski, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Anderson, L. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barnes, P. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beltran, M. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Billington, S. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bronfman, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giannetti, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kainulainen, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kauffmann, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, M-YUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leurini, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Medina, S-N X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montenegro-Montes, F. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Riener, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rigby, A. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Monge, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schisano, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Traficante, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wieneri, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-605863
DOI: 10.1093/mnras/staa2512
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 500
Number: 3
Page Range: S. 3050 - 3064
Date: 2021
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
CANDIDATE MASSIVE YSOS; MOLECULAR CLOUDS; MILKY-WAY; SPIRAL ARMS; (CO)-C-13 OBSERVATIONS; PHYSICAL-PROPERTIES; FORMATION RATES; RMS SURVEY; CATALOG; INNERMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60586

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