Spatial distribution of small hydrocarbons in the neighborhood of the ultra compact HII region Monoceros R2

Home

All issues

Volume 554 (June 2013)

A&A, 554 (2013) A87

Full HTML

Free Access

Table 6

Comparison between the abundances derived from observations and model predictions.

	A _V	X(CH) ^a	X(CCH) ^a	X(c-C₃H₂) ^a	N(CH)/N(CCH)	N(c-C₃H₂)/N(CCH)
	[mag]

	1–10		1.7 × 10^-8	1.4 × 10^-10	0.15	0.008
Meudon L_PDR+L_HD	1–10	1.1 × 10^-8	4.8 × 10^-8	1.3 × 10^-11	0.22	0.00025

	10–50		3.5 × 10^-9	1.4 × 10^-11	0.054	0.004
UCL_CHEM L_envf = 10^b	41	5.1 × 10^-10	1.3 × 10^-9	4.8 × 10^-13	0.39	0.0004
UCL_CHEM L_envf = 25^b	41	9.5 × 10^-10	6.9 × 10^-10	3.5 × 10^-11	1.37	0.05
UCL_CHEM L_envf = 45^b	41	7.5 × 10^-10	3.5 × 10^-10	1.4 × 10^-10	2.1	0.40

Notes.For the UCL_CHEM code, we show the results at t = 10⁴ years. For the observed abundances and the Meudon PDR results, we report mean values of the abundances, while for the UCL_CHEM results, we report the value at a given A_V, and assume that these values are relatively constant in the respective layers.

^(a)

Except for CH, where the uncertainty is driven by the excitation temperature, the abundance uncertainty is driven by the H₂ gas reference, and is a factor of 2.

^(b)

The f value indicates the percentage of CO on the icy mantles at the end of Phase I.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.