期刊
ASTROPHYSICAL JOURNAL
卷 721, 期 2, 页码 1570-1578出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/721/2/1570
关键词
astrochemistry; galaxies: nuclei; molecular data; molecular processes
资金
- National Science Foundation [AST-0702876]
- Center for the Chemistry of the Universe
- French program PCMI
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0847919] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [GRANTS:13777732] Funding Source: National Science Foundation
We present a new interstellar chemical gas-phase reaction network for time-dependent kinetics that can be used for modeling high-temperature sources up to approximate to 800 K. This network contains an extended set of reactions based on the Ohio State University (OSU) gas-phase chemical network. The additional reactions include processes with significant activation energies, reverse reactions, proton exchange reactions, charge exchange reactions, and collisional dissociation. Rate coefficients already in the OSU network are modified for H-2 formation on grains, ion-neutral dipole reactions, and some radiative association reactions. The abundance of H2O is enhanced at high temperature by hydrogenation of atomic O. Much of the elemental oxygen is in the form of water at T >= 300 K, leading to effective carbon-rich conditions, which can efficiently produce carbon-chain species such as C2H2. At higher temperatures, HCN and NH3 are also produced much more efficiently. We have applied the extended network to a simplified model of the accretion disk of an active galactic nucleus.
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