Fingers of God ·
Redshift-Space Distortion
un
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.com · Coma cluster · σ_v ≈ 1,000 km/s · virial smearing
True size
~6 Mpc
Finger
0 Mpc
operation
—
Cluster galaxies
Line of sight → observer
Peculiar-velocity Doppler smear
Kaiser infall (squash)
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