Molecular depletion times and the CO-to-H2 conversion factor in metal-poor galaxies

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Volume 583 (November 2015)

A&A, 583 (2015) A114

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Table 2

¹²CO(1–0) emission line parameters.

Name	Telescope time	Component	Channel	T_rms(mb)^a	Offset	FWHM	Integrated intensity^b
	(min)		(km s^-1)	(K)	(km s^-1)	(km s^-1)	(K km s^-1)



CGCG007-025	524	Total	10.5	0.0018	–39	115	0.286 (0.095)
		Total	15.7	0.0016	–39	105	0.285 (0.102)

II Zw 40^c	−

Mrk 996	573	1	5.2	0.0019	–1	28	0.18 (0.03)
		2	5.2		39	10	0.05 (0.02)
		Total	5.2		0	−	0.23 (0.04)

NGC 1140	831	1	5.2	0.0016	–17	26	0.32 (0.05)
		2	5.2		3	8	0.07 (0.04)
		3	5.2		30	38	0.18 (0.05)
		4	5.2		64	7	0.04 (0.02)
		Total	5.2			−	0.61 (0.08)
		Total^d	5.2		0	−	1.00 (0.13)

NGC 1156	47	1	10.4	0.0076	–84	13	0.36 (0.09)
		2	10.4		–35	100	0.89 (0.09)
		3	10.4		44	42	0.48 (0.09)
		Total	10.4		0	−	1.25 (0.16)
		Total^d	10.4	0.0076	0	−	4.04 (0.52)

NGC 3353 [0′′, 0′′]	79	1	5.2	0.0056	–31	60	1.83 (0.17)
		2	5.2		21	16	0.34 (0.11)
		Total	5.2		0	−	2.17 (0.20)
		Total^d	5.2		0	−	3.07 (0.29)
NGC 3353 [0′′, +10′′]	77	1	5.2	0.0045	–35	42	1.38 (0.12)
		2	5.2		19	22	0.43 (0.12)
		Total	5.2		0	−	1.81 (0.17)
NGC 3353 [−6′′, −9′′]	80	1	5.2	0.0046	–17	71	0.84 (0.20)
		2	5.2		25	36	0.62 (0.18)
		3	5.2		98	31	0.30 (0.08)
		Total	5.2		0	−	1.46 (0.27)

NGC 7077	585	1	5.2	0.0017	–5	20	0.25 (0.03)
		2	5.2		35	30	0.20 (0.04)
		Total	5.2		0	−	0.45 (0.05)

SBS 0335−052E^e	−

UM 448	454	1	5.3	0.0017	–115	20	0.11 (0.04)
		2	5.3		–58	63	0.42 (0.16)
		3	5.3		1	44	0.52 (0.14)
		Total	5.3		0	−	1.04 (0.22)

UM 462	119	Total	10.4	0.0034	–9	121	0.824 (0.173)
		Total	15.7	0.0032	–8	116	0.749 (0.207)

Notes.

^(a)

This and all temperature units in this table are main-beam, T_mb.

^(b)

Values in parentheses are the uncertainties. The total line flux is the sum of the individual components, and the total uncertainty is calculated by adding in quadrature the individual uncertainties.

^(c)

As discussed in the text, we did not observe this galaxy in ¹²CO(1–0), but rather relied on the data reported by Taylor et al. (1998).

^(d)

With aperture corrections as described in the text.

^(e)

We did not observe this galaxy in ¹²CO(1–0), but rather adopted the ¹²CO(3–2) data reported by Hunt et al. (2014), converted to CO(1–0) assuming a CO(3–2)/CO(1–0) flux ratio of 0.6.

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