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CO Excitation Workshop . PDR Benchmark Progress. Starting Point PDR-1 (n=10 3 , =10). Starting Point PDR-2 (n=10 3 , =10 5 ). Starting Point PDR-3 (n=10 5.5 , =10). Starting Point PDR-4 ( n=10 5.5 , =10 5 ). Starting Point PDR-5 ( n=10 7 , =10 ). PDR 4, high n, high FUV.

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co excitation workshop

CO Excitation Workshop

PDR Benchmark Progress

pdr 4 high n high fuv
PDR 4, high n, high FUV

Tgas n(CO)

Large modelscatterlooksscary, but modelassumptionswerevastly different.

pdr 4 high n high fuv1
PDR 4, high n, high FUV

Tgas n(CO)

Duringtheworkshopweconcentrate on the „true“ PDR case #4, andtrytounderstandthedifferences

pdr 4 high n high fuv2
PDR 4, high n, high FUV

NEW

Tgas n(CO)

Duringtheworkshopweconcentrate on the „true“ PDR case #4, andtrytounderstandthedifferences

pdr 4 high n high fuv3
PDR 4, high n, high FUV

PE Heating, H2formationheating

Dustcontent

NEW

Tgas n(CO)

Duringtheworkshopweconcentrate on the „true“ PDR case #4, andtrytounderstandthedifferences

additional information1
Additional Information
  • Dusttemperaturesappearconsistent
  • Temperaturerangeforgrainsizedistributionscomparable
  • Relativelyhotdustthroughoutthewholecloud!
additional information2
Additional Information
  • Major heatingthroughphoto-electricheating
  • NO PAHs !
  • Differencesremain(FUV field?, electrondensity, …)
additional information3
Additional Information

Major coolants

[OI] gas-graincollisison

additional information4
Additional Information

Major coolants

[OI] gas-graincollisison

summary
Summary
  • Giventhecomplexity of thevariouscodesandthevagueness of thebenchmark (round 2) specificstheconvergence of theresultsis still remarkable.
  • Nonewmajorheating/coolingprocesscandidate
  • Major processesare :
    • Dustphysics
    • H2formation
    • FUV??
  • But theirdetailsremaintobeinvestigated