Investigating the chemical link between H2CO and CH3OH within the central molecular zone of NGC 253

Open Access

Table 5.

Inferred gas properties traced by CH₃OH from the Bayesian inference processes over the GMC regions investigated.

GMC	log(n_H2)	T_kin	log(N_A-CH3OH)	log(N_E-CH3OH)	η_ff	EAR_best	EAR range	X_CH3OH range
1a	$4 . 22_{- 0.11}^{+ 0.11}$ $4.22^{+0.11}_{-0.11}$	$76 . 06_{- 9.69}^{+ 11.44}$ $76.06^{+11.44}_{-9.69}$	$16 . 60_{- 0.06}^{+ 0.06}$ $16.60^{+0.06}_{-0.06}$	$16 . 32_{- 0.11}^{+ 0.13}$ $16.32^{+0.13}_{-0.11}$	$0 . 08_{- 0.01}^{+ 0.01}$ $0.08^{+0.01}_{-0.01}$	0.52	[0.35, 0.81]	1.2 × 10⁻⁸ − 1.4 × 10⁻⁷
2b	$5 . 18_{- 0.09}^{+ 0.12}$ $5.18^{+0.12}_{-0.09}$	$11 . 14_{- 0.55}^{+ 0.57}$ $11.14^{+0.57}_{-0.55}$	$16 . 40_{- 0.14}^{+ 0.10}$ $16.40^{+0.10}_{-0.14}$	$16 . 38_{- 0.19}^{+ 0.16}$ $16.38^{+0.16}_{-0.19}$	$0 . 09_{- 0.01}^{+ 0.01}$ $0.09^{+0.01}_{-0.01}$	0.95	[0.49, 1.91]	1.2 × 10⁻⁸ − 1.2 × 10⁻⁷
3	$6 . 53_{- 0.16}^{+ 0.19}$ $6.53^{+0.19}_{-0.16}$	$19 . 42_{- 0.93}^{+ 0.98}$ $19.42^{+0.98}_{-0.93}$	$15 . 96_{- 0.08}^{+ 0.08}$ $15.96^{+0.08}_{-0.08}$	$16 . 02_{- 0.11}^{+ 0.11}$ $16.02^{+0.11}_{-0.11}$	$0 . 18_{- 0.03}^{+ 0.04}$ $0.18^{+0.04}_{-0.03}$	1.15	[0.74, 1.78]	1.8 × 10⁻⁹ − 6.1 × 10⁻⁹
4	$6 . 89_{- 0.17}^{+ 0.21}$ $6.89^{+0.21}_{-0.17}$	$26 . 79_{- 1.37}^{+ 1.55}$ $26.79^{+1.55}_{-1.37}$	$14 . 99_{- 0.11}^{+ 0.18}$ $14.99^{+0.18}_{-0.11}$	$15 . 06_{- 0.10}^{+ 0.18}$ $15.06^{+0.18}_{-0.10}$	$0 . 73_{- 0.25}^{+ 0.19}$ $0.73^{+0.19}_{-0.25}$	1.17	[0.62, 2.29]	4.0 × 10⁻¹⁰ − 2.2 × 10⁻⁹
6	$6 . 86_{- 0.19}^{+ 0.25}$ $6.86^{+0.25}_{-0.19}$	$21 . 49_{- 1.01}^{+ 1.10}$ $21.49^{+1.10}_{-1.01}$	$15 . 76_{- 0.15}^{+ 0.12}$ $15.76^{+0.12}_{-0.15}$	$15 . 86_{- 0.16}^{+ 0.14}$ $15.86^{+0.14}_{-0.16}$	$0 . 28_{- 0.07}^{+ 0.11}$ $0.28^{+0.11}_{-0.07}$	1.26	[0.66, 2.45]	9.3 × 10⁻¹⁰ − 5.3 × 10⁻⁹
7	$5 . 33_{- 0.05}^{+ 0.05}$ $5.33^{+0.05}_{-0.05}$	$23 . 39_{- 0.96}^{+ 0.99}$ $23.39^{+0.99}_{-0.96}$	$16 . 64_{- 0.05}^{+ 0.05}$ $16.64^{+0.05}_{-0.05}$	$16 . 25_{- 0.07}^{+ 0.07}$ $16.25^{+0.07}_{-0.07}$	$0 . 12_{- 0.01}^{+ 0.01}$ $0.12^{+0.01}_{-0.01}$	0.41	[0.31, 0.54]	2.8 × 10⁻⁸ − 1.4 × 10⁻⁷
8a	$4 . 95_{- 0.06}^{+ 0.06}$ $4.95^{+0.06}_{-0.06}$	$29 . 47_{- 1.74}^{+ 2.05}$ $29.47^{+2.05}_{-1.74}$	$16 . 36_{- 0.05}^{+ 0.06}$ $16.36^{+0.06}_{-0.05}$	$15 . 75_{- 0.08}^{+ 0.08}$ $15.75^{+0.08}_{-0.08}$	$0 . 09_{- 0.01}^{+ 0.01}$ $0.09^{+0.01}_{-0.01}$	0.25	[0.18, 0.33]	3.7 × 10⁻⁹ − 8.8 × 10⁻⁸
9a	$4 . 82_{- 0.07}^{+ 0.07}$ $4.82^{+0.07}_{-0.07}$	$24 . 87_{- 1.22}^{+ 1.33}$ $24.87^{+1.33}_{-1.22}$	$16 . 33_{- 0.07}^{+ 0.07}$ $16.33^{+0.07}_{-0.07}$	$15 . 89_{- 0.10}^{+ 0.10}$ $15.89^{+0.10}_{-0.10}$	$0 . 14_{- 0.01}^{+ 0.01}$ $0.14^{+0.01}_{-0.01}$	0.36	[0.25, 0.54]	8.0 × 10⁻⁹ − 1.3 × 10⁻⁷


Range	4.11 − 7.11	10.59 − 87.5	14.88 − 16.66	14.96 − 16.54	0.07 − 0.92	0.25 − 1.26	[0.18 − 2.45]	4.0 × 10⁻¹⁰ − 1.4 × 10⁻⁷

Notes. The “EAR” stands for E-/A- spin isomer column density ratio of CH₃OH. In the column “EAR_best” we list the best-estimate EAR in each GMC region based on the inferred column density of A-CH₃OH and E-CH₃OH respectively. In the column “EAR range” we list the range of possible EAR subtended by the uncertainties of the inferred E- and A- CH₃OH column densities.

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