The SWAN view of dense gas in the Whirlpool - A cloud-scale comparison of N2H+, HCO+, HNC, and HCN emission in M51

Open Access

Fig. 16.

Left: Torques per unit mass from Querejeta et al. (2016b) estimated from dust corrected (3.6 μm) Spitzer images. Right: HNCO(4–3)/CO(1–0) emission from SWAN (Stuber et al. 2025) for pixels where HNCO(4–3) is detected > 3σ. N₂H⁺ contours are plotted on top.

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