Nascent chemical complexity in the prestellar core IRAS 16293E: Complex organics and deuterated methanol

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Table 2

Molecular column densities in IRAS 16293E.

Method	Molecule	T_ex (K)	N (cm⁻²)
RADEX	CH₃OH E	6.54±0.32	(6.17±1.95) × 10¹³
	CH₃OH A	6.60±0.47	(5.94±0.20) × 10¹³
	¹³CH₃OH E	6.75±1.34	(8.00±1.50) × 10¹¹
	¹³CH₃OH A	6.64±1.28	(8.50±0.15) × 10¹¹
	HCOOCH₃ A	26.0±4.59	(2.45±0.05) × 10¹²
RD	CH₃CHO A	${6.81}_{- 0.60}^{+ 0.33}$ $6.81$^{+0.33}_{-0.60}$$	${1.84}_{- 0.48}^{+ 0.49} \times 10^{12}$ $1.84$^{+0.49}_{-0.48}$ $\times$ 10$^{12}$$
	CH₂DOH e₀	${4.55}_{- 0.36}^{+ 0.20}$ $4.55$^{+0.20}_{-0.36}$$	${7.52}_{- 2.17}^{+ 2.18} \times 10^{12}$ $7.52$^{+2.18}_{-2.17}$ $\times$ 10$^{12}$$
LTE	CHD₂OH e₀	4.55	(2.64±0.83) × 10¹²
	CH₃OCH₃ EE	10	(1.30±0.39) × 10¹²
	CH₂CHCN	10	<0.05 × 10¹²

Notes. The best-fit kinetic temperature, T_k, used in the RADEX calculations for CH₃OH is 7.0 K (also used for ¹³CH₃OH), and for HCOOCH₃ A it is 27 K. For all methanol species and CH₃CHO a source size, θ_src, of 115″ was used. In the LTE method, we assumed a fixed T_ex without an associated error. Here, ‘RD’ denotes for which molecules the rotation diagram method was used.

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