FAUST - XX. The chemical structure and temperature profile of the IRAS 4A2 hot corino at 20–50 au

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Volume 695 (March 2025)

A&A, 695 (2025) A78

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Table 1

1σ confidence level results of the iCOM molecular lines analysis and line emitting radius fit toward IRAS 4A2.

Species	Physical parameters				Image fitting

	No dust obscuration		With dust obscuration
	Tgas (K)	Ntot (cm−2)	Tgas (K)	Ntot (cm−2)	$\bar{r}$ ${\mathop \chi \limits^ ^2} = 0.4$ ^(a) (au)	$θ_{source}^{(b)}$ $\theta _{{\rm{source}}}^{(b)}$ (arcsec)
non-LTE LVG

CH₃OH	90–120	1.4–4 × 1018	100–140	3 × 1018	40.1 (0.8)	0.30

LTE population diagram (PD)

HCOOCH₃	110–200	0.4–1.0 × 1018	160–270	0.8–1.3 × 1018	36.0 (1.0)	0.26
CH₃CH₂OH	130–215	>8 × 1017	190–310	>1.8 × 1018	27.0 (0.8)	0.19
CH₂OHCHO	110–340	>2 × 1017	160–430	>3.5 × 1017	22.0 (1.0)	0.15

LTE rotational diagram (RD)

CH₃CHO	180–228	2.1–3.1 × 1017	180–228	3.3-4.7 × 1017	28.0 (0.9)	0.20
NH₂CHO	197(c)	1.4–1.7 × 1016	197(c)	2.1–2.5 × 1016	23.0 (0.6)	0.16

Notes. ^(a)Weighted average emitting radius. The uncertainties are reported in parentheses. ^(b)Source size adopted for the analysis. ^(c)Fixed as the best-fit temperature derived for CH₂OHCHO.

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