Stéphane Courteau

Mass Modeling: Dutton etal (2005)
• Ingredients:
– Hα + HI rotation curves (Blais-Ouellette 2000)
– R-band surface brightness profile
– gas density profile
– adiabatic contraction
Blumenthal et al. (1986)
(verified by Jesseit etal 2002; Wilson 2003; Gnedin etal 2004;
Sellwood & McGaugh 2005; Kazantzidis etal 2005)
– (disk thickness, oblate halos)
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• Assume disk M/L and invert light profile ⇒ V disk
2 2 2 2
Vobs = Vdisk + Vgas + Vhalo
rM(r) = const
• Free parameters: disk M/L, halo (α, c, V 200)