A complete 12CO 2–1 map of M 51 with HERA - II. Total gas surface densities and gravitational stability

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Table 1:

Properties of $\Sigma _{\rm gas}$ and $\Sigma _{\rm H2}$ / $\Sigma _{\rm HI}$ in M 51 averaged over the areas shown in Fig. 2.
	$\Sigma _{\rm gas}$	$\Sigma _{\rm H2}$ / $\Sigma _{\rm HI}$
	[ $M_{\odot }$ pc^-2]
inner spiral arms	26.8	2.3
outer spiral arms	18.8	0.21
interarm region	9.4	0.71
outer disk	6.4	-
NGC 5195 - companion	20.2	0.4
ratio inner/outer spiral	1.4	11.0
inner arm/interarm	2.9	3.2
outer arm/interarm	2.0	0.3

Source LaTeX | All tables | In the text

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