Neutral Hydrogen Emission in Nearby X-ray-Selected Active Galaxies

We have searched for neutral hydrogen (H I) in 95 active galaxies using the 100-meter Green Bank Telescope. The sample includes only nearby active galaxies up to 220 Mpc away (redshifts up to 0.05). Our galaxies all contain Seyfert active galactic nuclei (AGN) detected in the hard X-ray (14-195 keV) by the Swift Gamma-ray Burst satellite’s Burst Alert Telescope (BAT) 22-month survey. The hard X-ray emission is purely from the AGN with no component from star formation in the host galaxy. By using this band for our selection method we include Seyfert AGN that are otherwise obscured in the optical and ultraviolet spectra. We present the H I systemic velocities, H I integrated line fluxes, and H I masses for the 37 galaxies with H I emission. Using published optical data we present maximum rotational velocities and dynamical masses for 27 of the galaxies with emission. We used the X-ray flux from the Swift BAT 22-month survey to calculate the corresponding X-ray luminosity, which is an estimate of the accretion rate of the AGN. We used this to explore relationships between the accretion rate of the AGN and properties of the host galaxy mainly the cold gas content and dynamical mass. We present the parameters of the relationships between both cold gas mass and dynamical mass with accretion rate of the AGN.