For a few standard galaxies we list their geometric parameters. Programs such as rotcur(1NEMO) and rvstack(1NEMO) will need these.
In the table below the center of rotation is listed in RA/DEC, as well as the VLSR (in km/s), followed by the inclination and the kinematic major axis (as defined by the receding side), and the near side minor axis (receding velocities if outflow along Z axis). If the galaxy has a bar, it’s relative position angle is also listed, both of these relative to the (kinematic) PA, add these numbers to get the PA of that feature.
As always in astronomy, position angles are measures from North, counterclockwise through East to South and West.
galaxy RA(J2000) DEC(J2000) VLSR INC PA_kin dPA_near dPA_bar - - rotation center km/s deg deg d-deg d-deg NGC253 00:47:33.134 -25:17:19.68 241 79.8 233 +90 +15: NGC253 00:47:35.2 -25:17:07.6 241 76.4 230 +90 +18: NGC1097 2:44:11.1 -30:29:03.0 1280 46 134 +90 +10: NGC1365 3:31:42.0 -36:18:18 1625 46 222 +90 +30: NGC1530 4:23:26.1 +75:17:43.6 2450 55 199 +90 +80: NGC2347 109.016250 +64.710800 4387 50.2 189.1 +90 n/a NGC4321 hhmmss.ssss ddmmdd.ssss vvv 50: 150: -90 n/a NGC5728 14:42:23.9 -17:15:11.1 2801 60 33 +90 ~0: NGC6503 17:49:26.30 +70:08:40.7 25 75 -60 -90 -80: Another way of saying is that if PA_near = +90, flow is clock wise, and -90 for counter clock wise. Values with : at the end means an eye estimate. Other values are from the literature. See Alsorotcur(1NEMO), rvstack(1NEMO) AuthorPeter Teuben Update History 11-may-2021 written PJT 3-jun-2021 finalized first batch PJT