Table 2: Schmidt Law ${\sum }_{\rm SFR} = A {{\sum }^n_{\rm gas}}$ observed in M 51 and other galaxies in comparison with the Schmidt-Law derived from simulations. $\sum _{\rm SFR}$ and A are in units of $M_{\odot }$ pc^-2 Gyr^-1 and $\sum _{\rm gas}$ in units of $M_{\odot }$ pc^-2. The values of the sample of Wong & Blitz (2002) hold for an extinction correction that depends on the gas column density.
A n Reference

Local Schmidt-laws:

M 51 $1.12\pm 0.50$ $1.35\pm 0.61$ this paper

M 33 $3.5\pm66$ $3.3\pm 0.07$ Heyer et al. (2004)

Milky Way $2.18\pm0.20$ Misiriotis et al. (2006)

7 CO-bright spiral galaxies $1.7\pm0.3$ Wong & Blitz (2002)

16 spiral galaxies $\sim$ 2 Boissier et al. (2003)

simulations $0.25\pm 0.16$ $1.31\pm 0.15$ Li et al. (2006)

Global Schmidt-laws:

97 normal and starburst galaxies $0.25\pm 0.07$ $1.4\pm 0.15$ Kennicutt (1998)

7 CO-bright spiral galaxies 1.7 Wong & Blitz (2002)

simulations $0.11\pm0.04$ $1.56\pm0.09$ Li et al. (2006)

**Table 2:** Schmidt Law ${\sum }_{\rm SFR} = A {{\sum }^n_{\rm gas}}$ observed in M 51 and other galaxies in comparison with the Schmidt-Law derived from simulations. $\sum _{\rm SFR}$ and A are in units of $M_{\odot }$ pc^-2 Gyr^-1 and $\sum _{\rm gas}$ in units of $M_{\odot }$ pc^-2. The values of the sample of Wong & Blitz (2002) hold for an extinction correction that depends on the gas column density.
	A	n	Reference
Local Schmidt-laws:
M 51	$1.12\pm 0.50$	$1.35\pm 0.61$	this paper
M 33	$3.5\pm66$	$3.3\pm 0.07$	Heyer et al. (2004)
Milky Way		$2.18\pm0.20$	Misiriotis et al. (2006)
7 CO-bright spiral galaxies		$1.7\pm0.3$	Wong & Blitz (2002)
16 spiral galaxies		$\sim$ 2	Boissier et al. (2003)
simulations	$0.25\pm 0.16$	$1.31\pm 0.15$	Li et al. (2006)
Global Schmidt-laws:
97 normal and starburst galaxies	$0.25\pm 0.07$	$1.4\pm 0.15$	Kennicutt (1998)
7 CO-bright spiral galaxies		1.7	Wong & Blitz (2002)
simulations	$0.11\pm0.04$	$1.56\pm0.09$	Li et al. (2006)

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