The Dark Matter Halo Density Profile, Spiral Arm Morphology, and Supermassive Black Hole Mass of M33

Table 1

M33 Observational data. The Hubble type is from de Vaucouleurs et al. [17]. The distance in kpc is taken from Magrini et al. [21].

Parameter	Measurement
Hubble type	SA(s)cd
Distance (kpc)	840
Position angle of major axis (°)	23
Bulge effective radius, 𝑅𝑒 (arcmin)	1.60  ±  0.11
Bulge effective radius, 𝑅𝑒 (kpc)	0.39 ± 0.03
Bulge surface brightness at the effective radius, 𝜇𝑒 (3.6 μm-mag arcsec^−2)	19.57 ± 0.98
Bulge Sérsic index, 𝑛	1.0
Disk central surface brightness, 𝜇0 (3.6 μm-mag arcsec^−2)	18.08 ± 1.02
Disk scalelength, ℎ (arcmin)	6.95 ± 0.49
Disk scalelength, ℎ (kpc)	1.70 ± 0.12
Disk luminosity, 𝐿disk (𝐿⊙)	(3.16 ± 0.30) × 10^9
Bulge-to-disk ratio, 𝐵/𝐷	0.03