Decomposition of the Visible and Dark Matter Mass Profiles in the\n Einstein Ring 0047-2808

2003/11/07 by Simon Dye, S. Dye, Dye, Simon +2
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0311185

6 Pages, 2 figures, IAU220 proceedings

arxiv created 2003/11/07 · openalex publication_date 2003/11/07 · arxiv updated 2009/12/01 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28

Abstract

Using our semi-linear inversion method, we measure the mass profile of the\nlens galaxy in the Einstein ring system 0047-2808. The lens is modelled as a\nbaryonic component following the observed light, embedded in a dark matter\ngeneralised NFW halo. The semi-linear method makes full use of the information\ncontent in the ring image. We determine an unevolved B-band mass to light ratio\nfor the baryons of 3.05 +0.45 -0.86 h₆5 M_sol/L_sol (95% CL), accounting for\n65% of the total projected mass within the radius of 1.16'' traced by the ring.\nThis result is obtained without need of dynamical measurements. The inner\nlogarithmic slope of the halo is found to be 0.87 +0.69 -0.61 (95% CL). We find\nthat the halo is fairly well aligned with the light but has only half the\nellipticity.\n

Related

• The dark matter halo of the gravitational lens galaxy 0047-2808
• Optical+NIR analysis of a Newly Confirmed Einstein ring at z∼1 from the Kilo-Degree Survey: Dark matter fraction, total and dark matter density slope and IMF
• Gravitational lensing evidence against extended dark matter halos
• The Distribution of Dark Mass in Galaxies: Techniques, Puzzles, and Implications for Lensing
• The lens mass in the Einstein ring JWST-ER1