Table B.1.
Impact of an alternative definition of offsets.
| ⟨θCO − Hα⟩ | σ | ρ | ΩP | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| peak | 2nd p. | weight | peak | 2nd p. | weight | peak | 2nd p. | weight | peak | 2nd p. | weight | |
| IC1954 | 206 | 176 | 137 | 1040 | 1166 | 465 | 0.29 | 0.16 | 0.18 | 32.7 | 33.6 | 28.8 |
| NGC0628 | 236 | 220 | 154 | 948 | 1304 | 333 | 0.15 | 0.02 | 0.20 | 31.7 | 32.7 | 32.4 |
| NGC1300 | 457 | -90 | 426 | 3587 | 2615 | 2272 | -0.01 | -0.11 | -0.05 | 23.0 | 23.1 | 23.0 |
| NGC1385 | 265 | 54 | 189 | 1040 | 1125 | 663 | 0.31 | 0.14 | 0.27 | 26.1 | 26.4 | 25.9 |
| NGC1512 | -402 | -778 | -654 | 3083 | 3317 | 3991 | 0.19 | -0.02 | 0.23 | 21.4 | 21.4 | 21.3 |
| NGC1566 | 403 | 451 | 330 | 1064 | 1119 | 642 | 0.56 | 0.44 | 0.50 | 25.0 | 24.8 | 24.0 |
| NGC1672 | 106 | -31 | -29 | 582 | 565 | 222 | -0.21 | -0.19 | -0.41 | 15.1 | 15.0 | 14.4 |
| NGC2090 | 33 | 124 | 1 | 596 | 600 | 138 | -0.14 | -0.08 | -0.12 | 147.2 | -218.7 | 97.9 |
| NGC2283 | 201 | 93 | 3 | 752 | 888 | 307 | 0.32 | 0.33 | 0.24 | 28.2 | 31.9 | 34.0 |
| NGC2566 | 737 | 73 | -16 | 5110 | 6712 | 3456 | 0.01 | 0.01 | 0.20 | 16.1 | 16.2 | 16.2 |
| NGC2835 | -11 | -10 | -96 | 852 | 1222 | 622 | 0.21 | 0.14 | 0.18 | 29.3 | 29.3 | 29.8 |
| NGC2997 | 250 | 358 | 494 | 2135 | 1557 | 1509 | -0.01 | 0.04 | 0.11 | 28.2 | 28.1 | 28.0 |
| NGC3507 | 146 | 134 | -119 | 1757 | 2391 | 717 | 0.23 | 0.12 | -0.21 | 27.6 | 22.8 | 23.1 |
| NGC3627 | 176 | 90 | 201 | 962 | 984 | 371 | 0.29 | 0.34 | 0.40 | 26.6 | 29.6 | 19.1 |
| NGC4254 | 377 | 271 | 181 | 1093 | 1086 | 603 | 0.14 | 0.04 | 0.03 | 15.2 | 2.4 | 97.0 |
| NGC4303 | 691 | 596 | 112 | 2070 | 2393 | 663 | 0.40 | 0.13 | 0.24 | 34.8 | 35.3 | 35.3 |
| NGC4321 | 409 | 151 | 398 | 1738 | 1243 | 537 | 0.09 | 0.08 | 0.21 | 22.5 | 22.7 | 15.7 |
| NGC4535 | 0 | -27 | 208 | 937 | 1030 | 793 | -0.29 | -0.09 | -0.29 | 27.2 | 27.2 | 27.1 |
| NGC4548 | 254 | 53 | 31 | 896 | 743 | 269 | -0.03 | -0.15 | -0.51 | 36.7 | 36.8 | 40.8 |
| NGC4731 | 188 | 194 | 115 | 575 | 653 | 438 | 0.23 | 0.15 | 0.38 | 25.1 | 26.0 | 24.8 |
| NGC5194 | 399 | 155 | 456 | 1111 | 1800 | 1961 | -0.34 | -0.07 | 0.04 | 61.5 | 43.8 | 43.4 |
| NGC5248 | 72 | 47 | -66 | 798 | 679 | 476 | 0.21 | 0.20 | 0.21 | 25.3 | 25.2 | 26.1 |
| NGC5643 | 282 | 134 | -119 | 2114 | 2391 | 717 | 0.00 | 0.12 | -0.21 | 35.4 | 22.8 | 23.1 |
| NGC6744 | 1 | 134 | -119 | 1051 | 2391 | 717 | 0.21 | 0.16 | 0.18 | 23.0 | 22.9 | 23.2 |
Notes. Mean CO-Hα offsets, their scatter, the strength of the θ–Ω correlation (Spearman rank ρ) and the implied pattern speed (ΩP) for alternative definitions of offsets. ‘Peak’ represents our nominal measurement, based on the peak emission in CO and Hα (see Fig. 2); ‘2nd peak’ considers instead the azimuthal bin corresponding to the second brightest peak in CO and Hα for each spiral arm at each radius; finally, ‘weighted’ considers the mean azimuth weighted by CO and Hα luminosity for each spiral at each radius.
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