Dense molecular cocoons in the massive protocluster W3 IRS5: a test case for models of massive star formation

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Volume 558 (October 2013)

A&A, 558 (2013) A69

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Table 2

Detected molecular transitions in W3 IRS5.

Molecule^a	Frequency	Transition	E _u ^b	n _crit ^c
	(MHz)		(K)	(cm^-3)

CS	342 883.0	J = 7–6	66	2.0 × 10⁷
SO	344 310.6	N_J = 8₈–7₇	87	1.2 × 10⁷
³³SO	343 086.1	N_J = 8₉–7₈, F = 15/2–13/2	78	1.4 × 10⁷
	343 087.3	N_J = 8₉–7₈, F = 17/2–15/2	78	1.4 × 10⁷
	343 088.1	N_J = 8₉–7₈, F = 19/2–17/2	78	1.4 × 10⁷
	343 088.3	N_J = 8₉–7₈, F = 21/2–19/2	78	1.4 × 10⁷
SO₂	342 761.6	J_{K_a,K_c} = 34_3,31–34_2,32	582	^d
	343 923.8	J_{K_a,K_c} = 24_2,22–23_3,21v₂ = 1	1038	^d
³³SO₂	353 741.0	J_{K_a,K_c} = 19_4,16–19_3,17, F = 39/2–39/2	213	2.5 × 10⁷
	353 741.1	J_{K_a,K_c} = 19_4,16–19_3,17, F = 37/2–37/2	213	2.5 × 10⁷
	353 741.6	J_{K_a,K_c} = 19_4,16–19_3,17, F = 41/2–41/2	213	2.5 × 10⁷
	353 741.6	J_{K_a,K_c} = 19_4,16–19_3,17, F = 35/2–35/2	213	2.5 × 10⁷
³⁴SO₂	344 245.3	J_{K_a,K_c} = 10_4,6–10_3,7	88	3.4 × 10⁷
	344 581.0	J_{K_a,K_c} = 19_1,19–18_0,18	167	4.8 × 10⁷
	353 002.4	J_{K_a,K_c} = 14_7,7–15_6,10	212	1.5 × 10⁷
	354 277.6	J_{K_a,K_c} = 34_3,31–34_2,32	580	^d
	354 397.8	J_{K_a,K_c} = 19_8,12–20_7,13	326	2.9 × 10⁷
HCN	354 505.5	J = 4–3	43	1.8 × 10⁸
	354 460.5	J = 4–3 v₂ = 1	1067	^d
HC¹⁵N	344 200.3	J = 4–3	43	1.2 × 10⁸
H₂CS	342 944.4	J_{K_a,K_c} = 10_0,10–9_0,9	91	^d
HNCO	352 897.9	J_{K_a,K_c} = 16_1,15–15_1,14, F = 17–16	187	3.0 × 10⁷
	352 897.9	J_{K_a,K_c} = 16_1,15–15_1,14, F = 16–15	187	3.0 × 10⁷
	352 897.9	J_{K_a,K_c} = 16_1,15–15_1,14, F = 15–14	187	3.0 × 10⁷
CH₃OH	342 729.8	J_K = 13₁–13₀A	227	4.8 × 10⁷

Notes.

^(a)

Spectroscopy data taken from JPL molecular spectroscopy and CDMS.

^(b)

Upper level energy.

^(c)

Critical density at 100 K derived from LAMDA (Schöier et al. 2005). The critical densities for ³³SO, ³³SO₂ and ³⁴SO₂ are quoted from their main isotopologues.

^(d)

Collisional rate coefficient is not available for this transition.

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