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We present a general method for identifying the pre-main-sequence populationof any star-forming region, unbiased with respect to the presence or absence ofdisks, in contrast to samples selected primarily via their mid-infraredemission from Spitzer surveys. We have applied this technique to a new, deep,wide-field, near-infrared imaging survey of the Rho Ophiuchi cloud core tosearch for candidate low mass members. In conjunction with published SpitzerIRAC photometry, and least squares fits of model spectra (COND, DUSTY, NextGen,and blackbody) to the observed spectral energy distributions, we haveidentified 948 candidate cloud members within our 90% completeness limits ofJ=20.0, H=20.0, and K_S=18.50. This population represents a factor of ~3increase in the number of known young stellar objects in the Rho Ophiuchicloud. A large fraction of the candidate cluster members (81% +/- 3%) exhibitinfrared excess emission consistent with the presence of disks, thusstrengthening the possibility of their being bona fide cloud members.Spectroscopic follow-up will confirm the nature of individual objects, betterconstrain their parameters, and allow an initial mass function to be derived.

A Significant Population of Candidate New Members of the Rho Ophiuchi Cluster