1 21

12

1 2

2 21,2

4 1

collineair geval:Einstein ring

4

niet collineair geval: 2 beelden

14

2

LSS

S L

LSE

S L

S S E

GM D

c D D

GM D

c D D

2 2 2

2 2 2

2 22 2 2

2

' '

min min

L E L E L E

S

E

L E

L E

LS AS AL

D D D

x AL vt

vt tx x x

D T

DT

v

Spherical lensEinstein ring

Elongated lensEinstein cross

Lens = clusterArcs and arcletsAbbell 2218 cluster

•Mass map of galaxy cluster Cl0024+1654•Superposition of 2 images•Blue = dark matter map•Light = luminous matter map•Red dots = galaxies in cluster•HST and ground based observations + mass mapping models•Dark matter is present where galaxies clump together = ‘glue’