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Table 1

Properties of the methanol lines considered in this work.

Transition Rest frequency (GHz) Aij (s−1) Eup (K) ncrit,ij (cm−3)
(2−1 − 1−1) 96.739358 2.557794 × 10−6 12.5 2.8 × 104
(20 − 10) 96.744545 3.407341 × 10−6 20.1 3.1 × 104
(21 − 11) 96.755501 2.624407 × 10−6 28.0 2.7 × 104
(50–40) 241.700159 6.036633 × 10−5 47.9 5.5 × 105
(5−1−4−1) 241.767234 5.806215 × 10−5 40.4 4.8 × 105
(70 − 60) 338.124488 1.696120 × 10−4 78.1 1.2 × 106
(7−1 −6−1) 338.344588 1.666997 × 10−4 70.6 1.2 × 106

Notes. The transitions are indicated as JK−JK′′$\[J_{K}-J_{K^{\prime}}^{\prime}\]$). The Einstein coefficient for spontaneous emission, the energy of the upper level above the ground state, and the critical density of the transitions are indicated as Aij, Eup, and ncrit,ij, respectively.

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