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J/A+A/595/A94 Temperature structures in Galactic center clouds (Immer+, 2016)
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Beginning of ReadMe :J/A+A/595/A94 Temperature structures in Galactic center clouds (Immer+, 2016)
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Temperature structures in Galactic center clouds.
Direct evidence for gas heating via turbulence.
Immer K., Kauffmann J., Pillai T., Ginsburg A., Menten K.M.
<Astron. Astrophys. 595, A94 (2016)>
=2016A&A...595A..94I (SIMBAD/NED BibCode)
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ADC_Keywords: Milky Way ; Molecular clouds ; Radio lines
Keywords: Galaxy: center - ISM: molecules - ISM: structure - ISM: clouds -
submillimeter: ISM
Description:
The Central Molecular Zone (CMZ) at the center of our Galaxy is the
best template to study star formation processes under extreme
conditions, similar to those in high-redshift galaxies. We observed
on-the-fly maps of para-H_2_CO transitions at 218GHz and 291GHz with
the Atacama Pathfinder Experiment (APEX) telescope towards seven
Galactic center clouds. From the temperature-sensitive integrated
intensity line ratios of H_2_CO(3_21_-2_20_)/H_2_CO(3_03_-2_02_) and
H_2_CO(4_22_-3_21_)/H_2_CO(4_04_-3_03_) in combination with radiative
transfer models, we produce gas temperature maps of our targets. Our
targets have a complex velocity structure that requires a careful
disentanglement of the different components. We produce temperature
maps for each of the velocity components and show that the
temperatures of the components differ, revealing temperature gradients
in the clouds.