Table 3: Spiral arm pitch angles, NFW concentration parameters, and central supermassive black hole mass for 5 galaxies. For the Malin 1 the spiral arm pitch angle is taken from Moore and Parker [65]. For M31, the pitch angle is the average of values taken from Arp [66] and Braun [67]. The NFW concentration value is taken from (1) Seigar [64], (2) Klypin et al. [68], (3) Seigar et al. [34], and (4) Seigar et al. [28]. The black hole mass estimates are taken from (5) Ghez et al. [69], (6) Bender et al. [54], and (7) Gebhardt et al. [18].

Galaxy name Spiral arm pitch angle (degrees) 𝑐 v i r Source 𝑀 B H ( M ) Source

Malin 1 2 5 . 0 ± 1 . 0 8 . 0 ± 1 . 0 (1)
Milky Way 12.0 (2) ( 3 . 7 ± 0 . 2 ) × 1 0 6 (5)
M31 7 . 1 ± 0 . 4 2 0 . 0 ± 1 . 1 (3) ( 1 . 7 ± 0 . 6 ) × 1 0 8 (6)
M33 4 2 . 2 ± 3 . 0 4.0 <1500(7)
IC2522 3 8 . 8 ± 1 . 6 8 . 0 ± 1 . 0 (4)
ESO582G12 2 2 . 6 ± 0 . 6 2 2 . 0 ± 5 . 0 (4)