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We propose that structural, kinematical, and chemical properties of theGalactic globular clusters (GCs) can contain fossil information of the cosmicreionization history. We first summarize possible observational evidences forthe influence of reionization on the Galactic GC formation. We then show howstructural properties of the GC system (GCS) in the Galaxy can be influenced bysuppression of GC formation due to reionization during the Galaxy formationthrough hierarchical merging of subgalactic clumps, by using numericalsimulations with and without suppression of GC formation by reionization. Inparticular, we show that if GC formation in dwarf galaxies that are buildingblocks of the Galaxy and virialized after reionization era ($z_{reion}$) arecompletely suppressed, the present-day radial distribution of the Galactic GCsdepends strongly on $z_{reion}$. Our numerical results imply that if GCformation after $z_{reion}$ $\sim$ 15 is strongly suppressed, the origin of theobserved structural properties of the Galactic GCS can be more naturallyexplained in the framework of the hierarchical clustering scenario.Comment: 8 pages 3 figures (1 color jpg) ApJL in press (626, L93

The Galactic Globular Cluster System as a Fossil Record of Reionization