Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-23T22:10:33.191Z Has data issue: false hasContentIssue false
  • English
  • Français

Probing star formation relations of mergers and normal galaxies across the CO ladder

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Thomas R. Greve
Thomas R. Greve*
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We examine integrated luminosity relations between the IR continuum and the CO rotational ladder observed for local (ultra) luminous infra-red galaxies ((U)LIRGs, LIR ≥ 1011 M⊙) and normal star forming galaxies in the context of radiation pressure regulated star formation proposed by Andrews & Thompson (2011). This can account for the normalization and linear slopes of the luminosity relations (log LIR = α log L'CO + β) of both low- and high-J CO lines observed for normal galaxies. Super-linear slopes occur for galaxy samples with significantly different dense gas fractions. Local (U)LIRGs are observed to have sub-linear high-J (Jup > 6) slopes or, equivalently, increasing LCOhigh-J/LIR with LIR. In the extreme ISM conditions of local (U)LIRGs, the high-J CO lines no longer trace individual hot spots of star formation (which gave rise to the linear slopes for normal galaxies) but a more widespread warm and dense gas phase mechanically heated by powerful supernovae-driven turbulence and shocks.

Keywords

ISM: lines and bandsISM: moleculesgalaxies: ISMgalaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , pp. 49 - 52
Copyright
Copyright © International Astronomical Union 2016 

References

Aalto, S., Costagliola, F., González-Alfonso, E., et al. 2015 A&A, in pressGoogle Scholar
Andrews, B. H. & Thompson, T. A. 2011 ApJ, 727, 97 Google Scholar
Bayet, E., Gerin, M., Phillips, T. G., et al. 2009 MNRAS, 399, 264 CrossRefGoogle Scholar
Gao, Y. & Solomon, P. M. 2004, ApJ, 152, 63 Google Scholar
García-Burillo, S., Usero, A., Alonso-Herrero, A., et al. 2012, A&A, 539, A8 Google Scholar
Greve, T. R., Leonidaki, I., Xilouris, E. M., et al. 2014, ApJ, 794, 142 Google Scholar
Kamenetzky, J., Rangwala, N., Glenn, J., et al. 2015, ApJ, submittedGoogle Scholar
Kepley, A. A., Leroy, A. K., Frayer, D., et al. 2014, ApJ, 780, 13 CrossRefGoogle Scholar
Liu, D., et al. 2015, ApJ, 780, 13 Google Scholar
Papadopoulos, P. P., van der Werf, P. P., Isaak, K., & Xilouris, E. M. 2012, ApJ, 715, 775 Google Scholar
Papadopoulos, P. P., Zhang, Z.-Y., Xilouris, E. M., et al. 2014 ApJ, 788, 153 Google Scholar
Rosenberg, M. J. F., van der Werf, P. P., Aalto, S., et al. 2015, ApJ, 801, 72 Google Scholar
van der Werf, P. P., Isaak, K. G., Meijerink, R., et al. 2010, A&A, 518, L42 Google Scholar
Wu, J., Evans, N. J. II, Shirley, Y. L., & Knez, C. 2010 ApJS, 188, 313 Google Scholar
Zhang, Z.-Y., Gao, Y., Henkel, C., et al. 2014 ApJ, 784, L31 Google Scholar