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, 𝑅 𝑒 (arcmin) 1.60  ±  0.11
Bulge effective radius, 𝑅 𝑒 (kpc) 0.39 ± 0.03
Bulge surface brightness at the effective radius, 𝜇 𝑒 (3.6 μm-mag arcsec−2) 19.57 ± 0.98
Bulge Sérsic index, 𝑛 1.0
Disk central surface brightness, 𝜇 0 (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, 𝐿 d i s k ( 𝐿 ⊙ ) (3.16 ± 0.30) × 109
Bulge-to-disk ratio, 𝐵 / 𝐷 0.03