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We report the discovery of a buried, active supermassive black hole in SDSSJ085153.64+392611.76, a bulgeless Seyfert 2 (Sy2) galaxy. Keck near-infraredobservations reveal a hidden broad line region, allowing for the rare casewhere strong constraints can be placed on both the black hole mass and bulgecomponent. Using virial mass estimators, we obtain a black hole mass oflog($M_{\rm{BH}}/M_{\odot}$) = $6.78 \pm 0.50$. This is one of the only Sy2 AGNhosted in a bulgeless galaxy with a virial black hole mass estimate and couldprovide important constraints on the formation scenarios of the black hole seedpopulation. The lack of a bulge component suggests that the SMBH has grownquiescently, likely caused by secular processes independent of major mergers.In the absence of a detectable bulge component, we find the $M_{\rm{BH}}$ -$M_{\rm{stellar}}$ relation to be more reliable than the $M_{\rm{BH}}$ -$M_{\rm{bulge}}$ relation. In addition, we detect extended narrow Pa$\alpha$emission that allows us to create a rotation curve where we seecounter-rotating gas within the central kiloparsec (kpc). Possible causes ofthis counter-rotation include a galactic bar or disruption of the inner gas bya recent fly-by of a companion galaxy. This in turn could have triggeredaccretion onto the central SMBH in the current AGN phase.

The Discovery of a Hidden Broad Line AGN in a Bulgeless Galaxy: Keck NIR Spectroscopic Observations of SDSS J085153.64+392611.76