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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
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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

References

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