Azimuthal offsets in spiral arms of nearby galaxies

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Table 1.

Mean CO-Hα and CO-NIR offsets and their scatter.

	⟨θ_{CO − Hα}⟩	σ	$⟨ θ_{CO - H α}^{inner} ⟩$ $\langle \theta_{\mathrm{CO-H\alpha}}^{\mathrm{inner}} \rangle$	σ	$⟨ θ_{CO - H α}^{outer} ⟩$ $\langle \theta_{\mathrm{CO-H\alpha}}^{\mathrm{outer}} \rangle$	σ	⟨θ_{CO − NIR}⟩	σ	$⟨ θ_{CO - NIR}^{inner} ⟩$ $\langle \theta_{\mathrm{CO-NIR}}^{\mathrm{inner}} \rangle$	σ	$⟨ θ_{CO - NIR}^{outer} ⟩$ $\langle \theta_{\mathrm{CO-NIR}}^{\mathrm{outer}} \rangle$	σ
IC1954	206^⋆	1040	242^⋆	1029	171^⋆	1062	536	1157	536	717	536^⋆	1469
NGC 0628	236	948	343	1223	152	650	220	934	185^⋆	1138	247	739
NGC 1300	457	3587	656	4318	278^⋆	2801	526	2728	1660	3506	–485^⋆	1021
NGC 1385	265	1040	503	1215	21.8^⋆	767	370^⋆	1272	451^⋆	1344	288^⋆	1205
NGC 1512	–402	3083	–9.0^⋆	3761	–916^⋆	1784	990^⋆	4702	2142	5928	–516^⋆	1193
NGC 1566	403	1064	750	916	60.1	1094	545	1452	990	1627	105^⋆	1097
NGC 1672	106	582	10.0^⋆	789	178	352	184	570	–67.5^⋆	667	372	397
NGC 2090	32.5^⋆	596	7.4^⋆	676	56.1^⋆	520	32.2^⋆	798	93.3^⋆	822	–25.1^⋆	783
NGC 2283	201	752	411	739	–0.2^⋆	716	64.6	703	179^⋆	739	–45.5^⋆	656
NGC 2566	737	5110	1509	6182	78.7	3900	1206	4866	2714	6153	–78.8	2878
NGC 2835	–11.3	852	123	997	–181	586	–232	998	–46.7	1131	–466	743
NGC 2997	250	2135	199	1244	311	2876	618	1857	194	1052	1133	2420
NGC 3507	146^⋆	1757	232^⋆	1622	55.6^⋆	1908	752^⋆	1920	844^⋆	1907	655^⋆	1956
NGC 3627	176	962	251	827	83.7^⋆	1107	–154^⋆	1157	–141^⋆	1041	–170^⋆	1294
NGC 4254	377	1093	357	918	410	1344	55.2^⋆	1175	251^⋆	988	–273^⋆	1382
NGC 4303	691	2070	1181^⋆	2191	316^⋆	1922	–229^⋆	3911	681^⋆	5244	–925^⋆	2317
NGC 4321	409	1738	590	2018	86.1	1018	903	2317	1400	2599	17.4^⋆	1319
NGC 4535	0.1	937	–155^⋆	1070	209	680	269^⋆	1112	288^⋆	1062	244^⋆	1189
NGC 4548	254^⋆	896	394^⋆	639	128^⋆	1073	–332^⋆	1090	40.9^⋆	672	–665^⋆	1282
NGC 4731	188^⋆	575	355^⋆	531	–10.9^⋆	571	193^⋆	965	162^⋆	701	229^⋆	1221
NGC 5194	399	1111	29.3^⋆	923	761	1164	335	761	152^⋆	481	516	927
NGC 5248	71.8^⋆	798	209	891	–110^⋆	616	–212	656	–117	750	–338	481
NGC 5643	282	2114	295	2481	269^⋆	1671	265	2240	160	2663	373	1712
NGC 6744	1.2^⋆	1051	307^⋆	1388	–37.5^⋆	1006	457	2770	–98.9^⋆	912	527	2918

Notes. Average azimuthal offsets among tracers (CO and Hα, CO and NIR) for each galaxy considering all radial bins, ⟨θ_CO − X⟩, the innermost half of the radial bins, $⟨ θ_{CO - X}^{inner} ⟩$ $\langle \theta_{\mathrm{CO-X}}^{\mathrm{inner}} \rangle$ , and the outermost half of the radial bins, $⟨ θ_{CO - X}^{outer} ⟩$ $\langle \theta_{\mathrm{CO-X}}^{\mathrm{outer}} \rangle$ . The σ column next to each average value shows the standard deviation of that distribution. The ⋆ superscript indicates that the distribution of offsets is statistically indistinguishable from a normal distribution with the same standard deviation randomly distributed around zero (KS test with mean p-value greater than 0.05 over 10 000 runs).

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