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We investigate the presence of a central black hole (BH) in B023-G078, M31'smost massive globular cluster. We present high-resolution, adaptive-opticsassisted, integral-field spectroscopic kinematics from Gemini/NIFS that shows astrong rotation ($\sim$20 km/s) and a velocity dispersion rise towards thecenter (37 km/s). We combine the kinematic data with a mass model based on atwo-component fit to $HST$ ACS/HRC data of the cluster to estimate the mass ofa putative BH. Our dynamical modeling suggests a $>$3$\sigma$ detection of a BHcomponent of 9.1$^{+2.6}_{-2.8}\times$10$^4$ M$_\odot$ (1$\sigma$uncertainties). The inferred stellar mass of the cluster is6.22$^{+0.03}_{-0.05}\times$10$^6$ M$_\odot$, consistent with previousestimates, thus the BH makes up 1.5% of its mass. We examine whether theobserved kinematics are caused by a collection of stellar mass BHs by modelingan extended dark mass as a Plummer profile. The upper limit on the size scaleof the extended mass is 0.56 pc (95% confidence), which does not rule out anextended mass. There is compelling evidence that B023-G078 is the tidallystripped nucleus of a galaxy with a stellar mass $>$10$^9$ M$_{\odot}$,including its high mass, two-component luminosity profile, color, metallicitygradient, and spread in metallicity. Given the emerging evidence that thecentral BH occupation fraction of $>$10$^9$ M$_{\odot}$ galaxies is high, themost plausible interpretation of the kinematic data is that B023-G078 hosts acentral BH. This makes it the strongest BH detection in a lower mass ($<$10$^7$M$_{\odot}$) stripped nucleus, and one of the few dynamically detectedintermediate-mass BHs.

Detection of a $\sim$100,000 M$_\odot$ black hole in M31's most massive globular cluster: A tidally stripped nucleus