The Black Hole in IC 1459 from Hubble Space Telescope Observations of the Ionized Gas Disk

摘要: The peculiar elliptical galaxy IC 1459 (MV = -21.19, D 16.5 h-1 Mpc) has a fast counterrotating stellar core, shells and ripples, blue nuclear point source, strong radio core emission. We present results of detailed Hubble Space Telescope study 1459, in particular its central gas disk, aimed at constraining the mass distribution. obtained WFPC2 narrowband imaging centered on Hα+[N II] emission lines to determine flux distribution small radii, we FOS spectra six aperture positions along major axis sample kinematics. construct dynamical models for Hβ kinematics that include supermassive black hole which is constrained by observed surface brightness ground-based In one set assume rotates circular orbits an infinitesimally thin disk. Such adequately reproduce fluxes steepness rotation velocity gradient implies must be present. There are some differences between various line species observe wavelength range 4569–6819 A. Species with higher critical densities generally have more concentrated toward nucleus, velocities higher. This can attributed qualitatively presence hole. evidence few arcsec certain amount asymmetric drift, therefore alternative resides collisionless cloudlets move isotropically. All consistent M• 1–4 × 108 M⊙, without always ruled out high confidence. implied ratio holes 0.4–1.5 10-3, not inconsistent other galaxies. These add interesting data studies nature galactic nuclei.