Surveying the Whirlpool at Arcseconds with NOEMA (SWAN) - II. Survey design and observations

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Table 4.

Typical line ratios with ¹²CO.

Line ratio	Full disk	Center	Disk	F_line	F_CO
HCN(1−0)/CO	$0.059 \pm_{0.009}^{0.027}$ $0.059 \pm^{0.027}_{0.009}$	$0.166 \pm_{0.015}^{0.101}$ $0.166 \pm^{0.101}_{0.015}$	$0.049 \pm_{0.015}^{0.018}$ $0.049 \pm^{0.018}_{0.015}$	0.95	0.83
HNC(1−0)/CO	$0.027 \pm_{0.003}^{0.010}$ $0.027 \pm^{0.010}_{0.003}$	$0.058 \pm_{0.001}^{0.029}$ $0.058 \pm^{0.029}_{0.001}$	$0.022 \pm_{0.005}^{0.006}$ $0.022 \pm^{0.006}_{0.005}$	0.87	0.66
HCO⁺(1−0)/CO	$0.039 \pm_{0.006}^{0.012}$ $0.039 \pm^{0.012}_{0.006}$	$0.067 \pm_{0.006}^{0.039}$ $0.067 \pm^{0.039}_{0.006}$	$0.037 \pm_{0.008}^{0.01}$ $0.037 \pm^{0.01}_{0.008}$	0.93	0.78
N₂H⁺(1−0)/CO	$0.017 \pm_{0.002}^{0.007}$ $0.017 \pm^{0.007}_{0.002}$	$0.024 \pm_{0.002}^{0.008}$ $0.024 \pm^{0.008}_{0.002}$	$0.016 \pm_{0.002}^{0.006}$ $0.016 \pm^{0.006}_{0.002}$	0.75	0.45
HNCO(5−4)/CO	$0.014 \pm_{0.001}^{0.007}$ $0.014 \pm^{0.007}_{0.001}$	$0.026 \pm_{0.007}^{0.010}$ $0.026 \pm^{0.010}_{0.007}$	$0.011 \pm_{- 0.0}^{0.004}$ $0.011 \pm^{0.004}_{-0.0}$	0.74	0.09
HNCO(4−3)/CO	$0.014 \pm_{0.001}^{0.006}$ $0.014 \pm^{0.006}_{0.001}$	$0.021 \pm_{0.006}^{0.008}$ $0.021 \pm^{0.008}_{0.006}$	$0.013 \pm_{0.010}^{0.005}$ $0.013 \pm^{0.005}_{0.010}$	0.68	0.25
C¹⁸O(1−0)/CO	$0.035 \pm_{0.007}^{0.009}$ $0.035 \pm^{0.009}_{0.007}$	$0.034 \pm_{0.006}^{0.007}$ $0.034 \pm^{0.007}_{0.006}$	$0.035 \pm_{0.007}^{0.009}$ $0.035 \pm^{0.009}_{0.007}$	0.89	0.77
¹³CO(1−0)/CO	$0.125 \pm_{0.024}^{0.028}$ $0.125 \pm^{0.028}_{0.024}$	$0.137 \pm_{0.028}^{0.028}$ $0.137 \pm^{0.028}_{0.028}$	$0.124 \pm_{0.024}^{0.028}$ $0.124 \pm^{0.028}_{0.024}$	0.98	0.96
C₂H(1−0)/CO	$0.019 \pm_{0.001}^{0.007}$ $0.019 \pm^{0.007}_{0.001}$	$0.035 \pm_{0.006}^{0.012}$ $0.035 \pm^{0.012}_{0.006}$	$0.016 \pm_{0.001}^{0.005}$ $0.016 \pm^{0.005}_{0.001}$	0.55	0.32

Notes. Average line ratios with ¹²CO(1−0) inside the full FoV (limited to the area covered by the mosaics (see Fig. 1), the central 1 kpc (in diameter), and the disk excluding the central 1 kpc. Average line ratios were determined from pixels in the moment-0 maps where both lines are detected significantly (> 3σ). We provide the difference between the average and the 25^th and 75^th percentiles as an uncertainty. To estimate the fraction of emission that originates from regions of significant detection, we provide the masked-to-unmasked flux ratio for both the specific emisison line (F_Line) and CO (F_CO). This ratio was calculated by comparing the total flux in the full FoV within regions were the flux exceeds the > 3σ threshold (masked flux) to the total flux without applying any threshold (unmasked flux).

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