Molecular and atomic gas in the Local Group galaxy M 33

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Table 4

Comparison of results with previous studies of M 33.

CO surveys	Molecular gas mass^b	SFR^g	Depletion time^k	Depletion time^l
	(M_⊙ )	(M_⊙ yr^-1)	(10⁸ yr)	(10⁸ yr)

This study	1.9 × 10⁸ ( 3.3 × 10⁸)^c	0.27^h	7	7
Gardan et al. (2007)	3.2 × 10⁷^d	0.05–0.13ⁱ	2–6	1–3
Rosolowsky et al. (2007)	3.6 × 10⁸^d	0.45^j	8	...
Heyer et al. (2004)	3.5 × 10⁸^e	0.45^j	8	1–3
Engargiola et al. (2003)	9 × 10⁷^d	0.24ⁱ	4	2
Corbelli (2003)^a	2.9 × 10⁸^f	0.45^j	6	...

HI surveys	Atomic gas mass^m

This study	1.4 × 10⁹
Putman et al. (2009)	1.5 × 10⁹ⁿ
Corbelli & Schneider (1997)	2.6 × 10⁹^o
Deul & van der Hulst (1987)	1.1 × 10⁹

Notes.

^(a)

FCRAO CO(1–0) data from Heyer et al. (2004).

^(b)

All values converted to our adopted X_CO = 4 × 10²⁰ cm^-2/(K km s^-1) (twice Galactic).

^(c)

The value in parentheses is the extrapolation to the whole galaxy for comparison with other surveys. See Sect. 3.1.1 for details.

^(d)

Original value used X_CO = 2 × 10²⁰ cm^-2/(K km s^-1) (Galactic).

^(e)

Original value used X_CO = 3 × 10²⁰ cm^-2/(K km s^-1).

^(f)

Original value used X_CO = 2.8 × 10²⁰ cm^-2/(K km s^-1).

^(g)

Over the areas mapped in CO for each survey.

^(h)

From Verley et al. (2009).

⁽ⁱ⁾

From H_α with a Kennicutt (1998) calibration.

^(j)

We give the value from Engargiola et al. (2003) as the CO mapped areas are identical.

^(k)

Value computed by dividing the first by the second column of this table.

^(l)

Original value given by the cited papers.

^(m)

All values converted to our adopted distance D = 840 kpc.

⁽ⁿ⁾

Original value used a distance of 730 kpc. Inside a 3.2 × 10²⁰ cm^-2 contour.

^(o)

Original value used a distance of 690 kpc. Over their whole mapped area extending beyond 8.5 kpc.

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