Gas, dust, and the CO-to-molecular gas conversion factor in low-metallicity starbursts

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Volume 675 (July 2023)

A&A, 675 (2023) A64

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Table 2.

Observational CO parameters.

Name	V_sys^(a)	FWZI ^(b)	Imaged	12 m beam	12 m rms	12 m total ^(c)	12 m total ^(d)	12 m total ^(e)
	(km s⁻¹)	(km s⁻¹)	area		(mJy beam⁻¹)	(Jy km s⁻¹)	(Jy km s⁻¹)	(10⁵ K km s⁻¹ pc²)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
NGC 625	395.50	[−45, − 5]	46″ × 30″	208 × 149 (85.7°)	1.4	15.2 ± 1.5	14.19 ± 1.4	5.64
				39 pc × 28 pc
NGC 1705	631.93	[−50, − 5; 80, 102]	40″ × 30″	249 × 182 (−83.9°)	1.2	0.95 ± 0.05	0.86 ± 0.05	0.63
				63 pc × 46 pc
NGC 5253	406.56	[−50, 40]	50″ × 30″	268 × 241 (85.3°)	1.3	12.5 ± 0.04	12.1 ± 0.1	3.35
				43 pc × 39 pc

				7 m beam	7 m rms	7 m total ^(c)	7 m total ^(d)	7 m total ^(e)
					(mJy beam⁻¹)	(Jy km s⁻¹)	(Jy km s⁻¹)	(10⁵ K km s⁻¹ pc²)

NGC 625				121 × 78 (89.0°)	6.4	14.85 ± 1.5	14.7 ± 1.5	5.52
				229 pc × 147 pc
NGC 1705				124 × 91 (89.9°)	7.0	0.55 ± 0.05	0.44 ± 0.05	0.37
				314 pc × 230 pc
NGC 5253				130 × 79 (89.7°)	6.4	14.1 ± 1.3	13.8 ± 1.2	3.77
				209 pc × 127 pc

Notes.

^(a)

Radio convention systemic velocity from observed sky frequency;

^(b)

full-width zero intensity (FWZI) as shown in Fig. 1;

^(c)

flux in all available pixels in the velocity-weighted line-intensity (zero moment) maps;

^(d)

flux with S/N ≥ 3 in zero moment maps;

^(e)

CO line luminosity.

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