VLT/ISAAC infrared spectroscopy of embedded high-mass YSOs in the Large Magellanic Cloud: Methanol and the 3.47 μm band

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Volume 585 (January 2016)

A&A, 585 (2016) A107

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Table 5

Ice column densities and abundances for Galactic high-mass YSOs.

Object	N(H₂O)	N(CH₃OH)^*	N(CO)	N(CO₂)	N(CH₃OH)	N(CO)	N(CO₂)
					/N(H₂O)	/N(H₂O)	/N(H₂O)
	(10¹⁷ cm^-2)	(10¹⁷ cm^-2)	(10¹⁷ cm^-2)	(10¹⁷ cm^-2)	(%)	(%)	(%)

S140 IRS 1	19^a	<0.9^b	...	4.2^c	<4.5	...	22.1
Mon R2 IRS 2	35.6^a	1.9^d	2.7^a	6.0^c	5.4	7.6	16.9
Mon R2 IRS 3	19^a	<1.3^b	...	1.6^c	<6.7	...	8.4
RAFGL989	22.4^e	0.7^e	4.5^a	8.1^c	3.3	20	36.2
RAFGL2136	45.7^e	3.5^d	2.7^a	7.8^c	7.6	5.9	17.1
RAFGL2591	12^a	2.4^a	...	1.6^c	20.3	...	13.3
RAFGL7009S	113.1^e	35.5^b	18^a	25^c^,⁺	31.4	16	22.1
W33 A	125.7^e	19.9^d	8.9^a	14.5^c	15.8	7.1	11.5
NGC 7538 IRS1	22^a	<1.1^b	1.8^a	5.1^c	<5.1	8.2	23.2
NGC 7538 IRS9	64.1^e	4.1^d	12^a	16.3^c	6.4	18.7	25.4
Orion BN	25^a	<1.1^b	...	2.9^c	<4.5	...	11.6
Orion IRC2	24.5^a	3.6^a	...	2.6^c	14.6	...	10.6
W3 IRS 5	56.5^e	<2.3^b	1.6^a	7.1^c	<4.1	3.1	12.6

Notes.All the values are taken from the literature.

^(*)

Methanol column densities are recalculated using the band strength of 5.3 × 10^-18 cm molecule^-1 and Δν of 31 cm^-1, except for RAGL7009S, whose column density is estimated from the combination modes at 3.9 μm.

⁽⁺⁾

Estimated from the 15.2 μm absorption band.

Reference.

^(a)

Gibb et al. (2004);

^(b)

Dartois et al. (1999);

^(c)

Gibb et al. (2004);

^(d)

Brooke et al. (1999);

^(e)

Boogert et al. (2008).

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