Decomposition of the Visible and Dark Matter Mass Profiles in the Einstein Ring 0047 − 2808
نویسنده
چکیده
Using our semi-linear inversion method, we measure the mass profile of the lens galaxy in the Einstein ring system 0047−2808. The lens is modelled as a baryonic component following the observed light, embedded in a dark matter generalised NFW halo. The semi-linear method makes full use of the information content in the ring image. We determine an unevolved B-band mass to light ratio for the baryons of 3.05 −0.86 h65 M⊙/LB⊙ (95% CL), accounting for 65% of the total projected mass within the radius of 1.16 traced by the ring. This result is obtained without need of dynamical measurements. The inner logarithmic slope of the halo is found to be 0.87 −0.61 (95% CL). We find that the halo is fairly well aligned with the light but has only half the ellipticity.
منابع مشابه
The dark matter halo of the gravitational lens galaxy 0047 - 2808 Randall
The location of the images in a multiple-image gravitational lens system are strongly dependent on the orientation angle of the mass distribution. As such, we can use the location of the images and the photometric properties of the visible matter to constrain the properties of the dark halo. We apply this to the optical Einstein Ring system 00472808 and find that the dark halo is almost spheric...
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