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The hierarchical scenario of structure formation describes how objects likegalaxies and galaxy clusters are formed by mergers of small objects. In thisscenario, mergers of galaxies can lead to the formation of massive black hole(MBH) binary systems. On the other hand, the merger of two MBH could produce agravitational wave signal detectable, in principle, by the Laser InterferometerSpace Antenna (LISA). In the present work, we use the Press-Schechterformalism, and its extension, to describe the merger rate of haloes whichcontain massive black holes. Here, we do not study the gravitational waveemission of these systems. However, we present an initial study to determinethe number of systems formed via mergers that could permit, in a futureextension of this work, the calculation of the signature in gravitational wavesof these systems.

Massive Black Hole Binary Systems in Hierarchical Scenario of Structure Formation