Solid CO2 in quiescent dense molecular clouds - Comparison between Spitzer and laboratory spectra

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Table 4

Observed column densities (in units of 10¹⁷ cm^-2) of CO, H₂O, CO₂, and CH₃OH and A_V values for the lines of sight studied here.

Source ID/2MASS ID	Other ID	Cloud	A_V	N(CO)^a	N(H₂O)^b	N(CO₂)^c	N(CH₃OH)^d
			(mag)

041443.5+281708		Taurus	16.2 ± 1.5			2.7
042630.7+243637		Taurus	17.8 ± 1.5	7.4	16.4	3.0
042930.2+265827		Taurus	11.4 ± 1.5			1.9
043213.2+242910		Taurus	20.9 ± 1.5	7.5	22.5	3.6
043728.2+261024	Tamura 2	Taurus	6.3 ± 1.5		4.0	1.0
043926.9+255259	Elias 15	Taurus	15.3 ± 0.5	4.1	15.0	2.5
J04393886+2611266	Elias 16	Taurus	24.1 ± 0.5	6.5	25.7^e	5.4	<0.25
J18300061+0115201	CK2, EC 118	Serpens	34 ± 4	16.2	35	9.9	<2.1
J21472204+4734410	Q21-1	IC 5146	27 ± 1	7.1	25.2	8.7	0.24

Notes.

^(a)

From published observations (Chiar et al. 1994, 1995; Pontoppidan et al. 2003; Knez et al. 2005) as reported by Whittet et al. (2007, 2009).

^(b)

From published observations (Eiroa & Hodapp 1989; Murakawa et al. 2000; Smith et al. 1993; Whittet et al. 1988) as reported by Whittet et al. (2007, 2009).

^(c)

From published observations as reported by Whittet et al. (2007, 2009).

^(d)

From published observations (Chiar et al. 2011; Boogert et al. 2011).

^(e)

Average value from 3 μm spectra of Whittet et al. (1988), Smith et al. (1993), and Murakawa et al. (2000) as reported by Whittet et al. (2009).

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