We present an estimate of the mass of the supermassive black hole ( SMBH ) in the nearby type-1 Seyfert galaxy ( catalog NGC 1097 ) using Atacamma Large Millimeter/Submillimeter Array ( ALMA ) observations of dense gas kinematics .
Dense molecular gas dynamics are traced with { HCN } ( J = 1 - 0 ) and { HCO ^ { + } } ( J = 1 - 0 ) emission lines .
Assuming a host galaxy inclination of 46 ^ { \circ } , we derive a SMBH mass , M _ { BH } = 1.40 ^ { +0.27 } _ { -0.32 } \times 10 ^ { 8 } M _ { \odot } , and an I-band mass to light ratio to be 5.14 ^ { +0.03 } _ { -0.04 } , using { HCN } ( J = 1 - 0 ) .
The estimated parameters are consistent between the two emission lines .
The measured SMBH mass is in good agreement with the SMBH mass and bulge velocity dispersion relationship .
Our result showcases ALMA ’ s potential for deriving accurate SMBH masses , especially for nearby late-type galaxies .
Larger samples and accurate SMBH masses will further elucidate the relationship between the black hole ( BH ) and host galaxy properties and constrain the coevolutionary growth of galaxies and BHs .