Resolved gas temperatures and 12C/13C ratios in SVS13A from ALMA Observations of CH3CN and CH313CN

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Volume 696 (April 2025)

A&A, 696 (2025) A1

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Table 1

Kinematic components.

Component	Size (au²)	T_ex (K)	τ_dust	log₁₀(N_tot) (cm⁻²)	V_LSR (km s⁻¹)	V_in ^(a) (km s⁻¹)	ΔV (km s⁻¹)	CH₃CN/CH₃¹³CN
One-layer	27 660	${210.6}_{- 42.1}^{+ 72.7}$ $210.6_{ - 42.1}^{ + 72.7}$	${1.1}_{- 0.3}^{+ 0.3}$ ${1.1_{ - 0.3}^{ + 0.3}}$	${16.4}_{- 0.4}^{+ 0.6}$ ${16.4_{ - 0.4}^{ + 0.6}}$	${8.0}_{- 0.6}^{+ 0.8}$ ${8.0_{ - 0.6}^{ + 0.8}}$	–	${1.0}_{- 0.2}^{+ 0.2}$ ${1.0_{ - 0.2}^{ + 0.2}}$	${19.8}_{- 5.9}^{+ 6.9}$ ${19.8_{ - 5.9}^{ + 6.9}}$

I	27 660	${205.5}_{- 43.1}^{+ 79.1}$ ${205.5_{ - 43.1}^{ + 79.1}}$	${0.9}_{- 0.3}^{+ 0.4}$ ${0.9_{ - 0.3}^{ + 0.4}}$	${16.3}_{- 0.4}^{+ 0.5}$ ${16.3_{ - 0.4}^{ + 0.5}}$	${7.9}_{- 0.7}^{+ 0.8}$ ${7.9_{ - 0.7}^{ + 0.8}}$	–	${0.9}_{- 0.2}^{+ 0.2}$ ${0.9_{ - 0.2}^{ + 0.2}}$	${19.5}_{- 5.6}^{+ 8.6}$ ${19.5_{ - 5.6}^{ + 8.6}}$
II	7282	${178.9}_{- 47.0}^{+ 73.7}$ ${178.9_{ - 47.0}^{ + 73.7}}$	${0.4}_{- 0.4}^{+ 0.7}$ ${0.4_{ - 0.4}^{ + 0.7}}$	${15.8}_{- 0.3}^{+ 0.6}$ ${15.8_{ - 0.3}^{ + 0.6}}$	${9.0}_{- 0.1}^{+ 0.2}$ ${9.0_{ - 0.1}^{ + 0.2}}$	$- {2.1}_{- 0.3}^{+ 0.3}$ ${ - 2.1_{ - 0.3}^{ + 0.3}}$	${0.8}_{- 0.2}^{+ 0.2}$ ${0.8_{ - 0.2}^{ + 0.2}}$	${38.6}_{- 11.9}^{+ 34.0}$ ${38.6_{ - 11.9}^{ + 34.0}}$
III	1139	${105.8}_{- 6.6}^{+ 38.6}$ $105.8_{ - 6.6}^{ + 38.6}$	${0.4}_{- 0.4}^{+ 0.3}$ $0.4_{ - 0.4}^{ + 0.3}$	${15.6}_{- 0.1}^{+ 0.1}$ $15.6_{ - 0.1}^{ + 0.1}$	${10.6}_{- 0.2}^{+ 0.4}$ $10.6_{ - 0.2}^{ + 0.4}$	$- {2.2}_{- 0.2}^{+ 0.1}$ $- 2.2_{ - 0.2}^{ + 0.1}$	${0.9}_{- 0.1}^{+ 0.1}$ $0.9_{ - 0.1}^{ + 0.1}$	>80.0
IV	1274	${77.6}_{- 24.7}^{+ 31.5}$ ${77.6_{ - 24.7}^{ + 31.5}}$	${0.0}_{- 0.0}^{+ 0.1}$ ${0.0_{ - 0.0}^{ + 0.1}}$	${15.3}_{- 0.2}^{+ 0.3}$ ${15.3_{ - 0.2}^{ + 0.3}}$	${6.2}_{- 0.1}^{+ 0.1}$ ${6.2_{ - 0.1}^{ + 0.1}}$	${1.9}_{- 0.1}^{+ 0.1}$ ${1.9_{ - 0.1}^{ + 0.1}}$	${0.5}_{- 0.1}^{+ 0.1}$ ${0.5_{ - 0.1}^{ + 0.1}}$	${68.5}_{- 38.3}^{+ 11.5}$ ${68.5_{ - 38.3}^{ + 11.5}}$
V	869	${139.9}_{- 33.8}^{+ 18.2}$ $139.9_{ - 33.8}^{ + 18.2}$	${0.0}_{- 0.0}^{+ 0.3}$ $0.0_{ - 0.0}^{ + 0.3}$	${15.3}_{- 0.1}^{+ 0.0}$ $15.3_{ - 0.1}^{ + 0.0}$	${9.0}_{- 0.1}^{+ 0.1}$ $9.0_{ - 0.1}^{ + 0.1}$	${1.1}_{- 0.2}^{+ 0.2}$ $1.1_{ - 0.2}^{ + 0.2}$	${0.3}_{- 0.0}^{+ 0.0}$ $0.3_{ - 0.0}^{ + 0.0}$	${42.5}_{- 15.1}^{+ 37.5}$ $42.5_{ - 15.1}^{ + 37.5}$
VI	270	${121.1}_{- 11.8}^{+ 13.9}$ ${121.1_{ - 11.8}^{ + 13.9}}$	${0.0}_{- 0.0}^{+ 0.0}$ ${0.0_{ - 0.0}^{ + 0.0}}$	${15.3}_{- 0.1}^{+ 0.1}$ ${15.3_{ - 0.1}^{ + 0.1}}$	${7.5}_{- 0.1}^{+ 0.1}$ ${7.5_{ - 0.1}^{ + 0.1}}$	${1.3}_{- 0.1}^{+ 0.0}$ ${1.3_{ - 0.1}^{ + 0.0}}$	${0.8}_{- 0.1}^{+ 0.1}$ ${0.8_{ - 0.1}^{ + 0.1}}$	${15.0}_{- 3.4}^{+ 5.9}$ ${15.0_{ - 3.4}^{ + 5.9}}$

Notes. Numbers in the upper and lower limits are taken from the distributions in quantiles of 0.25 and 0.75. ^(a) The relative velocity of the component related to the main component I. A positive number indicates expanding motion and a negative one indicates infalling but should be taken with caution; see Appendix B.

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