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We present follow-up spectroscopy of the galaxy cluster MS1054-03 (z=0.83)confirming that at least six of the nine merging galaxy pairs identified by vanDokkum et al. (1999) are indeed bound systems: they have projected separationsof R_s<10 kpc and relative line-of sight velocities of dv<165 km/s. For theremaining three pairs, we were unable to obtain redshifts of both constituentgalaxies. To identify a more objective sample of merging systems, we selectbound red galaxy pairs (R_s<=30 kpc, dv<=300 km/s) from our sample of 121confirmed cluster members: galaxies in bound red pairs make up 15.7+/-3.6% ofthe cluster population. The (B-K_s) color-magnitude diagram shows that the pairgalaxies are as red as the E/S0 members and have a homogeneous stellarpopulation. The red pair galaxies span a large range in luminosity and internalvelocity dispersion to include some of the brightest, most massive members(L>L*, sigma>200 km/s); these bound galaxy pairs must evolve into E/S0 membersby z~0.7. These results combined with MS1054's high merger fraction andreservoir of likely future mergers indicates that most, if not all, of itsearly-type members evolved from (passive) galaxy-galaxy mergers at z<~1.

Spectroscopic Confirmation of Multiple Red Galaxy-Galaxy Mergers in MS 1054-03 ( z = 0.83)