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We present Hubble Space Telescope imaging and spectroscopic observations ofthree Brightest Cluster Galaxies, Abell 1836-BCG, Abell 2052-BCG, and Abell3565-BCG, obtained with the Wide Field and Planetary Camera 2, the AdvancedCamera for Surveys and the Space Telescope Imaging Spectrograph. The dataprovide detailed information on the structure and mass profile of the stellarcomponent, the dust optical depth, and the spatial distribution and kinematicsof the ionized gas within the innermost region of each galaxy. Dynamicalmodels, which account for the observed stellar mass profile and include thecontribution of a central supermassive black hole (SBH), are constructed toreproduce the kinematics derived from the Halpha and [N II](lambda 6548,6583)emission lines. Secure SBH detection with M_bh=3.61(+0.41,-0.50)x10^9 M_sun andM_bh=1.34(+0.21,-0.19)x10^9 M_sun, respectively, are obtained for Abell1836-BCG and Abell 3565-BCG, which show regular rotation curves and strongcentral velocity gradients. In the case of Abell 2052-BCG, the lack of anorderly rotational motion prevents a secure determination, although an upperlimit of M_bh < 4.60x10^9 M_sun can be placed on the mass of the central SBH.These measurements represent an important step forward in the characterizationof the high-mass end of the SBH mass function.

The High-Mass End of the Black Hole Mass Function: Mass Estimates in Brightest Cluster Galaxies