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Recent X-ray observations by Jiang et al. have identified an active galacticnucleus (AGN) in the bulgeless spiral galaxy NGC 3319, located just$14.3\pm1.1\,$Mpc away, and suggest the presence of an intermediate-mass blackhole (IMBH; $10^2\leq M_\bullet/\mathrm{M_{\odot}}\leq10^5$) if the Eddingtonratios are as high as 3 to $3\times10^{-3}$. In an effort to refine the blackhole mass for this (currently) rare class of object, we have explored multipleblack hole mass scaling relations, such as those involving the (not previouslyused) velocity dispersion, logarithmic spiral-arm pitch angle, total galaxystellar mass, nuclear star cluster mass, rotational velocity, and colour of NGC3319, to obtain ten mass estimates, of differing accuracy. We have calculated amass of $3.14_{-2.20}^{+7.02}\times10^4\,\mathrm{M_\odot}$, with a confidenceof 84% that it is $\leq$$10^5\,\mathrm{M_\odot}$, based on the combinedprobability density function from seven of these individual estimates. Ourconservative approach excluded two black hole mass estimates (via the nuclearstar cluster mass, and the fundamental plane of black hole activity$\unicode{x2014}$ which only applies to black holes with low accretion rates)that were upper limits of $\sim$$10^5\,{\rm M}_{\odot}$, and it did not use the$M_\bullet\unicode{x2013}L_{\rm 2-10\,keV}$ relation's prediction of$\sim$$10^5\,{\rm M}_{\odot}$. This target provides an exceptional opportunityto study an IMBH in AGN mode and advance our demographic knowledge of blackholes. Furthermore, we introduce our novel method of meta-analysis as abeneficial technique for identifying new IMBH candidates by quantifying theprobability that a galaxy possesses an IMBH.

Refining the mass estimate for the intermediate-mass black hole candidate in NGC 3319