- Line survey in the southwest lobe of the CND
- IRAM + APEX
- RADEX LVG analysis
- Assumed source size
- density 10^5
- grav unstable
- column densities in many molecules
- Physics affecting the chemistry
- cosmic ray ionization rate
- X-ray ionization
+ Less penetrating
- UV photons
+ highly dependent on extinction
+ 10^4-10^5 G_0
- Shocks
+ shock chemical models
+ gas & dust phase shock chem
- Concl
- High CR rates favored (zeta = 10^-14/s)
+ lower acceptable if UV included (zeta = 10^-15/s)
Questions
- Q: Ionization provides external pressure on clumps.
- A: Would like to include in model...?
- Q: Gamma ray ionization could do something. Considered?
- A: No, but cross-section is low. Need lots of gamma rays.
- Q Farhad: Age of molecular ring based on chemical model?
- A: Assumed some age from CR turn-on, not age of CND
- Q: More extreme CR ionization rate near Arches cluster, etc. What is the
best chemical approach for higher CR rate?
- A: If CR rate too high, can't form molecules / will destroy molecules