Recommended Thermal Rate Coefficients for the C + H$_3^+$ Reaction and Some Astrochemical Implications

Autor:	Vissapragada, S., Buzard, C. F., Miller, K. A., O'Connor, A. P., de Ruette, N., Urbain, X., Savin, D. W.
Rok vydání:	2016
Předmět:	Astrophysics - Instrumentation and Methods for Astrophysics Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
DOI:	10.3847/0004-637X/832/1/31
Popis:	We have incorporated our experimentally derived thermal rate coefficients for C + H$_3^+$ forming CH$^+$ and CH$_2^+$ into a commonly used astrochemical model. We find that the Arrhenius-Kooij equation typically used in chemical models does not accurately fit our data and use instead a more versatile fitting formula. At a temperature of 10 K and a density of 10$^4$ cm$^{-3}$, we find no significant differences in the predicted chemical abundances, but at higher temperatures of 50, 100, and 300 K we find up to factor of 2 changes. Additionally, we find that the relatively small error on our thermal rate coefficients, $\sim15\%$, significantly reduces the uncertainties on the predicted abundances compared to those obtained using the currently implemented Langevin rate coefficient with its estimated factor of 2 uncertainty. Comment: 19 pages, 5 figures. Accepted for publication in ApJ
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1605.00048 Zobrazit plný text záznamu View this record from Arxiv