Fig. 2.
Gas distribution in M 74. Top and middle: HI data with a resolution of 11.9″ × 9.3″ and 6.9″ × 5.6″, respectively (Walter et al. 2008). Bottom: CO(2–1) data with a resolution of 13.4″ (Leroy et al. 2009). Left: zeroth moment maps (integrated emission). Middle: first moment maps (velocity fields) relative to z = 0.00219 (656.545 km s−1). Right: second moment maps (velocity dispersion). The positions of SNe are marked by grey circles. The lines outline the main spiral arm. Each panel is 10′ per side. North is up and east is to the left.
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