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The mass scaling relation between supermassive black holes and their hostspheroids has previously been described by a quadratic or steeper relation atlow masses (10^5 < M_bh/M_sun < 10^7). How this extends into the realm ofintermediate mass black holes (10^2 < M_bh/M_sun < 10^5) is not yet clear,although for the barred Sm galaxy LEDA 87300, Baldassare et al. have recentlyreported a nominal virial mass M_bh=5x10^4 M_sun residing in a `spheroid' ofstellar mass equal to 6.3x10^8 M_sun. We point out, for the first time, thatLEDA 87300 therefore appears to reside on the near-quadratic M_bh-M_{sph,*}relation. However, Baldassare et al. modelled the bulge _and_ bar as the singlespheroidal component of this galaxy. Here we perform a 3-componentbulge+bar+disk decomposition and find a bulge luminosity which is 7.7 timesfainter than the published `bulge' luminosity. After correcting for dust wefind that M_bulge=0.9x10^8 M_sun, and M_bulge/M_disk=0.04 - which is now inaccord with ratios typically found in Scd-Sm galaxies. We go on to discussslight revisions to the stellar velocity dispersion (40+/-11 km/s) and blackhole mass (M_bh=2.9x10^4 M_sun) and show that LEDA 87300 remains consistentwith both the M_bh-sigma relation and the near-quadratic M_bh-M_{sph,*}relation when using the reduced bulge mass. LEDA 87300 therefore offers thefirst support for the rapid but regulated (near-quadratic) growth of blackholes, relative to their host bulge/spheroid, extending into the domain ofintermediate mass black holes.

Does the intermediate mass black hole in LEDA 87300 (RGG 118) follow the near-quadratic (M_bh)-(M_spheroid) relation?