The mass of the coma cluster from weak lensing in the Sloan Digital Sky Survey

We present a weak-lensing analysis of the Coma Cluster using the Sloan Digital Sky Survey Data Release 5. Complete imaging of an similar to 200 deg(2) region is used to measure the tangential shear of this cluster. The shear is fit to a Navarro, Frenk,& White model, and we find a virial radius of r(200) = 1.99 +0.21 -0.22 h(-1) Mpc, which corresponds to a virial mass of M-200 = 1.88 +0.65 -0.56 x 10(5) h(-1) M-circle dot. We additionally compare our weak-lensing measurement to the virial mass derived using dynamical techniques and find that they are in agreement. This is the lowest redshift, largest angle weak-lensing measurement of an individual cluster to date.