co excitation workshop pdr benchmark progress. starting point pdr-1 (n=10 3, =10)
DESCRIPTION
Starting Point PDR-2 (n=10 3, =10 5 )TRANSCRIPT
![Page 1: CO Excitation Workshop PDR Benchmark Progress. Starting Point PDR-1 (n=10 3, =10)](https://reader031.vdocuments.site/reader031/viewer/2022022804/5a4d1c117f8b9ab0599f6ef4/html5/thumbnails/1.jpg)
CO Excitation Workshop
PDR Benchmark Progress
![Page 2: CO Excitation Workshop PDR Benchmark Progress. Starting Point PDR-1 (n=10 3, =10)](https://reader031.vdocuments.site/reader031/viewer/2022022804/5a4d1c117f8b9ab0599f6ef4/html5/thumbnails/2.jpg)
Starting Point PDR-1 (n=103,=10)
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Starting Point PDR-2 (n=103,=105)
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Starting Point PDR-3 (n=105.5,=10)
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Starting Point PDR-4 (n=105.5,=105)
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Starting Point PDR-5 (n=107,=10)
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PDR 4, high n, high FUV
Tgas n(CO)
Large model scatter looks scary, but model assumptions were vastly different.
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Heating/Cooling
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Heating/Cooling
![Page 10: CO Excitation Workshop PDR Benchmark Progress. Starting Point PDR-1 (n=10 3, =10)](https://reader031.vdocuments.site/reader031/viewer/2022022804/5a4d1c117f8b9ab0599f6ef4/html5/thumbnails/10.jpg)
PDR 4, high n, high FUV
Tgas n(CO)
During the workshop we concentrate on the „true“ PDR case #4, and try to understand the differences
![Page 11: CO Excitation Workshop PDR Benchmark Progress. Starting Point PDR-1 (n=10 3, =10)](https://reader031.vdocuments.site/reader031/viewer/2022022804/5a4d1c117f8b9ab0599f6ef4/html5/thumbnails/11.jpg)
PDR 4, high n, high FUV
Tgas n(CO)
During the workshop we concentrate on the „true“ PDR case #4, and try to understand the differences
NEW
![Page 12: CO Excitation Workshop PDR Benchmark Progress. Starting Point PDR-1 (n=10 3, =10)](https://reader031.vdocuments.site/reader031/viewer/2022022804/5a4d1c117f8b9ab0599f6ef4/html5/thumbnails/12.jpg)
PDR 4, high n, high FUV
Tgas n(CO)
During the workshop we concentrate on the „true“ PDR case #4, and try to understand the differences
NEWPE Heating, H2 formation heatingDust content
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Starting Point PDR-4 (n=105.5,=105)
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Starting Point PDR-4 (n=105.5,=105)
NEW
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Additional Information
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Additional Information
• Dust temperatures appear consistent
• Temperature range for grain size distributions comparable
• Relatively hot dust throughout the whole cloud!
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Additional Information
• Major heating through photo-electric heating
• NO PAHs !• Differences remain
(FUV field?, electron density, …)
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Additional InformationMajor coolants
[OI] gas-grain collisison
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Additional InformationMajor coolants
[OI] gas-grain collisison
![Page 20: CO Excitation Workshop PDR Benchmark Progress. Starting Point PDR-1 (n=10 3, =10)](https://reader031.vdocuments.site/reader031/viewer/2022022804/5a4d1c117f8b9ab0599f6ef4/html5/thumbnails/20.jpg)
Summary
• Given the complexity of the various codes and the vagueness of the benchmark (round 2) specifics the convergence of the results is still remarkable.
• No new major heating/cooling process candidate• Major processes are :– Dust physics– H2 formation– FUV??
• But their details remain to be investigated