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The member stars in globular cluster M15 show a substantial spread in theabundances of r-process elements. We argue that a rare and prolific r-processevent enriched the natal cloud of M15 in an inhomogeneous manner. To criticallyexamine the possibility, we perform cosmological galaxy formation simulationsand study the physical conditions for the inhomogeneous enrichment. We explorea large parameter space of the merger event time and the site. Our simulationsreproduce the large r-process abundance spread if a neutron-star merger occursat \sim 100 pc away from the formation site of the cluster and in a limitedtime range of a few tens million years before the formation. Interestingly, abimodal feature is found in the Eu abundance distribution in some cases,similarly to that inferred from recent observations. M15 member stars do notshow clear correlation between the abundances of Eu and light elements such asNa that is expected in models with two stellar populations. We thus argue thata majority of the stars in M15 are formed in a single burst. The ratio of heavyto light r-process element abundance [Eu/Y] \sim 1.0 is consistent with that ofthe so-called r-II stars, suggesting that a lanthanide-rich r-process eventdominantly enriched M15.

Internal r-process abundance spread of M15 and a single stellar population model