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Temperature Evolution of Molecular Clouds in the Central Molecular Zone

Published online by Cambridge University Press:  09 February 2017

Nico Krieger ,
Jürgen Ott Open the ORCID record for Jürgen Ott [Opens in a new window] ,
Fabian Walter ,
J. M. Diederik Kruijssen ,
Henrik Beuther  and
the SWAG team
Nico Krieger
Affiliation:
Max Planck Institute for Astronomy, Heidelberg, Germany
Jürgen Ott
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, USA
Fabian Walter
Affiliation:
Max Planck Institute for Astronomy, Heidelberg, Germany National Radio Astronomy Observatory, Socorro, NM, USA
J. M. Diederik Kruijssen
Affiliation:
Max Planck Institute for Astronomy, Heidelberg, Germany Astronomisches Rechen-Institut, Universität Heidelberg, Germany
Henrik Beuther
Affiliation:
Max Planck Institute for Astronomy, Heidelberg, Germany
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Abstract

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We infer the absolute time dependence of kinematic gas temperature along a proposed orbit of molecular clouds in the Central Molecular Zone (CMZ) of the Galactic Center (GC). Ammonia gas temperature maps are one of the results of the “Survey of Water and Ammonia in the Galactic Center” (SWAG, PI: J. Ott); the dynamical model of molecular clouds in the CMZ was taken from Kruijssen et al. (2015). We find that gas temperatures increase as a function of time in both regimes before and after the cloud passes pericenter on its orbit in the GC potential. This is consistent with the recent proposal that pericenter passage triggers gravitational collapse. Other investigated quantities (line width, column density, opacity) show no strong sign of time dependence but are likely dominated by cloud-to-cloud variations.

Keywords

ISM: cloudsISM: evolutionISM: structureradio lines: ISMstars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 160 - 161
Copyright
Copyright © International Astronomical Union 2017 

References

Krieger, N. 2016a, Master thesis, University of HeidelbergGoogle Scholar
Krieger, N., Ott, J., Walter, F., et al. 2016b, in prep.Google Scholar
Kruijssen, J. M. D., Dale, J. E., & Longmore, S. N. 2015, MNRAS, 447, 1059 CrossRefGoogle Scholar
Longmore, S. N., Bally, J., Testi, L. et al. 2013a, MNRAS, 429, 987 CrossRefGoogle Scholar
Longmore, S. N., Kruijssen, J. M. D., Bally, et al. 2013b, MNRAS, 433, L15 CrossRefGoogle Scholar