Circumnuclear dense gas disk fuelling the active galactic nucleus in the nearby radio galaxy NGC 4261

The cold molecular gas in the circumnuclear disk (CND) of radio galaxies provides critical information for understanding mass accretion onto active galactic nuclei. We present first detection and maps HCN J=1-0 HCO+ emission lines from region a nearby galaxy, NGC 4261, using Northern Extended Millimeter Array. Both are detected at radial velocity +-700 km/s relative to systemic they arise CND with an outer radius 100 pc. fields fitted Keplerian rotation. enclosed is (1.6+-0.1)x10^9 M_solar, assuming inclination angle 64 degree. continuum image 80 GHz reveals weak two-sided jet structure extending over 5 kpc along east-west direction bright core centre. spectrum between 230 shows spectral index -0.34+-0.02, which suggests optically thin synchrotron radiation. dense associated calculated be 6.03x10^7 M_solar. It supports positive correlation rate supermassive black hole, though there uncertainties parameters correlation.