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Decomposition of the Visible and Dark Matter Mass Profiles in the Einstein Ring 0047–2808

Published online by Cambridge University Press:  26 May 2016

Simon Dye  and
Steve Warren
Simon Dye
Affiliation:
Astrophysics Group, Imperial College London, Blackett Labs, Prince Consort Road, London, SW7 2BW, U.K.
Steve Warren
Affiliation:
Astrophysics Group, Imperial College London, Blackett Labs, Prince Consort Road, London, SW7 2BW, U.K.

Abstract

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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 modeled as a baryonic component following the observed light embedded in a generalised dark matter NFW halo. The semi-linear method makes full use of the information content in the ring image. We determine a B-band mass to light ratio for the baryons of 2.33+0.30–0.62h M⊙/LB⊙ (99% CL), accounting for 54% of the total projected mass within the Einstein radius of 1.16″. The inner logarithmic slope of the halo is found to be 0.65+0.73–0.31 (99% CL). We find that the halo is fairly well aligned with the light but has only half the ellipticity.

Type
Part 4: Lensing
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 115 - 120
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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