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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