Gravitational lensing Flashcards
1
Q
Shear
A
2*gamma 1 = d^2/d1^2 psi - d^2/d2^2 psi
gamma 2 = d/d1 d/d2 psi
2
Q
Convergence
A
kappa = d^2/d1^2 psi+d^2/d2^2 psi = sigma/sigma_crit
3
Q
sigma_crit equation
A
c^2/(4 pi G) r_S/(r_L(r_S-r_L))
4
Q
Tangential shear
A
gamma t = kappa average (< theta) - kappa (theta)
