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Table 1.

Properties of the Cosmic Horseshoe (J1148+1930).

Component Properties Value
Lens Right ascension (a) 11h48m33s
Declination (a)
Redshift, zd (a) 0.444
Tangential arc source Redshift, zs, t (b) 2.381
Star forming rate (b) ≈100 M yr−1
Ring Diameter (a) 10.2″
Length (a) ≈300°
Enclosed mass (c), (d) ≈5 × 1012M
Radial arc source Redshift, zs, r (d) 1.961



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