A study of submillimeter methanol absorption toward PKS 1830−211: - Excitation, invariance of the proton-electron mass ratio, and systematics

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Volume 652 (August 2021)

A&A, 652 (2021) A5

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Table 2.

Best-fit parameters for the common methanol absorption profile (see Eq. (2)).

Velocity profile: Two-Gaussian velocity components
	G_k	v_i	Δv_k	(∫τdv)_k
		(km s⁻¹)	(km s⁻¹)	(km s⁻¹)

	G₁	v_i (see below)	5.36 ± 0.02	6.60 ± 0.15
	G₂	v_i + (3.08 ± 0.04)	14.5 ± 0.06	2.71 ± 0.06

Line and tuning parameters

	Rest freq.	f_c	γ_i	v_i	δv_ν^(a)
	(GHz)			(km s⁻¹)	(km s⁻¹)

B4a	302.370	0.567 ± 0.007	0.226 ± 0.005	−4.575 ± 0.029	0.022
	303.367		1.017 ± 0.023	−4.708 ± 0.011	0.020
	304.208		0.820 ± 0.018	−4.674 ± 0.012	0.020
	305.474		0.438 ± 0.009	−4.598 ± 0.017	0.019
	303.693 ^(b)		(164 ± 7) × 10⁻⁴	−4.606 ± 0.335	0.093
	304.494 ^(b)		(133 ± 6) × 10⁻⁴	−4.684 ± 0.414	0.093
B4b	302.370	0.611 ± 0.006	0.238 ± 0.005	−4.852 ± 0.018	0.022
	303.367		1.045 ± 0.021	−5.018 ± 0.007	0.020
	304.208		0.852 ± 0.017	−4.967 ± 0.008	0.020
	305.474		0.457 ± 0.009	−4.889 ± 0.011	0.019
	303.693 ^(b)		(169 ± 7) × 10⁻⁴	−4.972 ± 0.216	0.093
	304.494 ^(b)		(138 ± 6) × 10⁻⁴	−5.033 ± 0.264	0.093
B5	350.905 ^(c)	0.675 ± 0.009	1	−4.868 ± 0.010	0.018
	350.688		0.150 ± 0.002	−5.025 ± 0.039	0.021
B6	423.440	0.639 ± 0.015	0.318 ± 0.009	−4.661 ± 0.014	0.016
	423.469		0.206 ± 0.006	−4.621 ± 0.020	0.015
	423.538		0.076 ± 0.002	−4.554 ± 0.049	0.015
	423.675		0.018 ± 0.001	−4.519 ± 0.192	0.015
	423.913		0.006 ± 0.001	−4.371 ± 0.593	0.013
	445.571		0.616 ± 0.019	−4.661 ± 0.009	0.014
	447.118		0.011 ± 0.001	−4.540 ± 0.316	0.015
B7	520.179	0.754 ± 0.008	0.882 ± 0.018	−4.850 ± 0.006	0.013

Notes.

^(a)

Velocity uncertainty corresponding to that of the line rest frequency listed in the CDMS, given in Table A.1;

^(b)

line of ¹³CH₃OH. The opacity scaling factor was tied to that of the corresponding ¹²CH₃OH transition with a ¹²CH₃OH/¹³CH₃OH ratio, which was fit with a value 62 ± 3.

^(c)

Line taken as reference for the integrated opacity.

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