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

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Volume 702 (October 2025)

A&A, 702 (2025) A66

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Table 4.

Fitted slopes to binned line ratios as function of Σ_mol, Σ_SFR, Σ_*, P_DE, σ_CO and radius.

LR	Σ_mol	Σ_SFR	r	Σ_*	σ_CO	P_DE
HCN/N₂H⁺	–0.42±0.04	0.09±0.05^*	–0.32±0.04	0.29±0.04	–0.29±0.10^*	–0.25±0.04
HCO⁺/N₂H⁺	–0.20±0.03	–0.01±0.04^*	–0.08±0.04^*	–0.04±0.05^*	–0.10±0.06^*	–0.16±0.03
HNC/N₂H⁺	–0.27±0.03	0.07±0.04 ^*	–0.24±0.04	0.20±0.04 ^*	–0.27±0.08 ^*	–0.18±0.03

HCN/HNC	–0.14±0.01	0.04±0.02^*	–0.07±0.01	0.11±0.01	–0.01±0.03^*	–0.08±0.01
HCN/HCO⁺	–0.21±0.02	0.13±0.03	–0.22±0.02	0.34±0.02	–0.18±0.05^*	–0.08±0.02^*
HNC/HCO⁺	–0.07±0.01	0.10±0.01	–0.14±0.02	0.24±0.01	–0.15±0.04^*	–0.01±0.01^*

Notes. Fitted slopes of binned line ratios as function of Σ_mol, Σ_SFR, Σ_*, r, P_DE and σ_CO. Binned averages are calculated as described in Sect. 3.2 for all pixels in the FoV. The fitting is performed as before (i.e, Table 3). We mark values where the slope agrees within 5σ to a slope of zero with ^*.

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