In NGC 4321, HCN/CO, SFR/CO and SFR/HCN increase from upstream to downstream across spiral arms, indicating density-wave-driven sequences in gas density and star-formation efficiency; trends are weaker in M51.
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From gas to stars along the spiral wave: CO, HCN, and star formation variations across the spiral arms in NGC 4321 and M51
In NGC 4321, HCN/CO, SFR/CO and SFR/HCN increase from upstream to downstream across spiral arms, indicating density-wave-driven sequences in gas density and star-formation efficiency; trends are weaker in M51.