Chemistry and the XCO conversion factor
Munan GongMax Planck Institute for Extraterrestrial Physics (MPE)
Athena++ workshop, UNLV, March 2019 With Eve Ostriker and Chang-Goo Kim (Princeton)
Motivation
CO (2-1) line luminosities, from Sun+ (2018), PHANGS project
Column densities, from Kim+Ostriker (2017), TIGRESS simulations
chemistry
Chemical Network• What network?
Sternberg+Dalgarno 1995
• PDR code: ~50 species, ~500 reactions the “right answer”
• Our network: ~20 species, ~50 reactions
• Nelson+Langer (1999) network
Gong, Ostriker and Wolfire (2017), ApJ, 843:38 A Simple and Accurate Network for Hydrogen and Carbon Chemistry in the ISM
Simulating the Solar Neighbourhood nH T P Vz B
Kim+Ostriker (2017), movie by Chang-Goo Kim TIGRESS simulations: 3-phase ISM, self-consistent star
formation with supernova feedback.
snapshots in simulation
mock observation
chemistry +
radiation transfer
1kpc
Caution: the Resolution Effect
Increasing resolution
Gong, Ostriker and Kim (2018), ApJ, 858:16 The XCO Conversion Factor from Galactic Multiphase ISM Simulations
The XCO Conversion Factormock observation real observation of Orion
Gong, Ostriker and Kim (2018), ApJ, 858:16 The XCO Conversion Factor from Galactic Multiphase ISM Simulations
Cooling Function• We can also do chemistry… so that we don’t have to do chemistry?!
With Jeong-Gyu Kim, Eve Ostriker, Chang-Goo Kim, in prep
Z=0.1
Beyond Our Neighbourhood
With Chang-Goo Kim, Eve Ostriker, Jeong-Gyu Kim, in prep
I want chemistry too!
Iwantchemistrytoo!
Ihavejustheardthatlotsofpeoplehavedonechemistry
withAthena++…
Butnoneofthemisinthepublicrelease!@#$%
Athena++
Protoplanetary disks (Lile Wang)
Planetary atmosphere (Cheng Li)
Development Branch: promised her thesis
committee that time-dependent chemistry
would be ready 2 years ago (Munan Gong)
Dust Collisional Velocities in Protoplanetary Disks
With Bo Zhao, Alexei Ivlev, Paola Caselli, in prep
dust 1 dust 2
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