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We simultaneously and successfully fit the multi-epoch X-ray spectra of thetidal disruption event (TDE) 3XMM J215022.4-055108 using a modified version ofour relativistic slim disk model that now accounts for angular momentum lossesfrom radiation. We explore the effects of different disk properties and ofuncertainties in the spectral hardening factor fc and redshift z on theestimation of the black hole mass M and spin a. Across all choices oftheoretical priors, we constrain M to less than 2.2e4 Ms at 1 sigma confidence.Assuming that the TDE host is a star cluster associated with the adjacent,brighter, barred lenticular galaxy at z=0.055, we constrain M and a to be(1.75+0.45-0.05)e4 Ms and 0.8+0.12-0.02, respectively, at 1 sigma confidence.The high, but sub-extremal, spin suggests that, if this intermediate mass blackhole (IMBH) has grown significantly since formation, it has acquired its laste-fold in mass in a way incompatible with both the standard and chaotic limitsof gas accretion. Ours is the first clear IMBH with a spin measurement. Assuch, this object represents a novel laboratory for astro-particle physics; itsM and a place tight limits on the existence of ultralight bosons, ruling outthose with masses 1.0e-15 to 1.0e-16 eV.

Mass, Spin, and Ultralight Boson Constraints from the Intermediate Mass Black Hole in the Tidal Disruption Event 3XMM J215022.4-055108