The abundance of HNCO and its use as a diagnostic of environment

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Volume 510 (February 2010)

A&A, 510 (2010) A85

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Table 2:

Summary of the dark cloud (DC), hot core (HC) and PDR models used to model the time dependent HNCO gas-phase abundance.
Model	T (K)	$n_{{\rm H}}$ (cm^-3)	Initial chemistry	HNCO formation chemistry
DC1	10	$2.0 \times10^{4}$	Atomic	Reaction c only
DC2	10	$2.0 \times10^{4}$	Atomic	Reactions c,d,e and f
DC3	10	$2.0 \times10^{4}$	Atomic	Reactions d,e,f and g
DC4	10	$2.0 \times10^{4}$	Atomic	Reactions c,d,e,f and g
HC1	200	$2.0 \times10^{7}$	CC1	All
HC2	200	$2.0 \times10^{7}$	CC2	Gas phase only
HC3	200	$2.0 \times10^{7}$	CC3	Surface only (reactions a,b)
HC4	200	$2.0 \times10^{7}$	CC4	All
HC5	20	$2.0 \times10^{7}$	CC5	All
HC6	20	$2.0 \times10^{7}$	CC1	All
HC7	50	$2.0 \times10^{7}$	CC6	All
HC8	50	$2.0 \times10^{7}$	CC1	All
HC9	100	$2.0 \times10^{7}$	CC7	All
HC10	100	$2.0 \times10^{7}$	CC1	All
PDR1	50	$2.0 \times10^{4}$	Atomic	All
PDR2	50	$2.0 \times10^{4}$	Atomic	Gas phase only
PDR3	50	$2.0 \times10^{4}$	Atomic	Surface only (reactions a,b)
PDR4	50	$2.0 \times10^{7}$	CC1	All
PDR5	50	$2.4\times10^{5}$	CC1	All

Notes. T is the gas-phase temperature and $n_{{\rm H}}$ is the total hydrogen number density (both held constant). The initial chemistry was either atomic, where all species (except H) were in their elemental form, or evolved, where abundances from a collapsed cloud (CC) model were used. The collapsing cloud models are listed in a separate table.

Source LaTeX | All tables | In the text

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