The Local Dark Matter Density Yoshiaki Sofue (U-Tokyo & Meisei-U)

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Presentation transcript:

The Local Dark Matter Density Yoshiaki Sofue (U-Tokyo & Meisei-U) Grand rotation curve of the Galaxy (MW), covering the entire disk and Local Group (R=0.1kpc to ~1 Mpc), was constructed as in Figures. Least squares fitting by the de Vaucouleurs e-r^1/4 Bulge, Exponential Disk and NFW-profile Halo resulted in parameters as listed in Table. The Local DM density at Sun is estimated to be ρ0= 0.235±0.030 GeV cm-3 . ( Y.Sofue 2012, PASJ 64, in press. ) 　V0/R0=Ω0 (km s-1 kpc-1) ρ0 (GeV cm-3) Sofue (2012) 　200/8.0 ＝25.0 0.235±0.030 　 (248/8.2 ＝ 30.3 0.345 ±0.044) Salucci, et al. (2011) 　 (200/8.0 ＝ 25.0 0.29 ± 0.07) 　248/8.2 ＝ 30.3 0.43 ±0.11 M~RV2/G ρ0~M/R3 ~(V/R)2~ Ω2 MW B order MW ⇔ M31 de V. Bulge Expo. isk NFW Halo Galactic Parameters Least-sq. Fitting Grand Rotation Curve