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CO Excitation Workshop

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

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  1. CO Excitation Workshop PDR Benchmark Progress

  2. Starting Point PDR-1 (n=103,=10)

  3. Starting Point PDR-2 (n=103,=105)

  4. Starting Point PDR-3 (n=105.5,=10)

  5. Starting Point PDR-4 (n=105.5,=105)

  6. Starting Point PDR-5 (n=107,=10)

  7. PDR 4, high n, high FUV Tgas n(CO) Large modelscatterlooksscary, but modelassumptionswerevastly different.

  8. Heating/Cooling

  9. Heating/Cooling

  10. PDR 4, high n, high FUV Tgas n(CO) Duringtheworkshopweconcentrate on the „true“ PDR case #4, andtrytounderstandthedifferences

  11. PDR 4, high n, high FUV NEW Tgas n(CO) Duringtheworkshopweconcentrate on the „true“ PDR case #4, andtrytounderstandthedifferences

  12. PDR 4, high n, high FUV PE Heating, H2formationheating Dustcontent NEW Tgas n(CO) Duringtheworkshopweconcentrate on the „true“ PDR case #4, andtrytounderstandthedifferences

  13. Starting Point PDR-4 (n=105.5,=105)

  14. Starting Point PDR-4 (n=105.5,=105) NEW

  15. Additional Information

  16. Additional Information • Dusttemperaturesappearconsistent • Temperaturerangeforgrainsizedistributionscomparable • Relativelyhotdustthroughoutthewholecloud!

  17. Additional Information • Major heatingthroughphoto-electricheating • NO PAHs ! • Differencesremain(FUV field?, electrondensity, …)

  18. Additional Information Major coolants [OI] gas-graincollisison

  19. Additional Information Major coolants [OI] gas-graincollisison

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

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