The supermassive black hole of Fornax A

Abstract

The radio galaxy Fornax A (NGC 1316) is a prominent merger remnant in the outskirts of the Fornax cluster. Its giant radio lobes suggest the presence of a powerful AGN and thus a central supermassive black hole (SMBH). We present high-resolution adaptive optics assisted integral-field data of Fornax A, taken with SINFONI at the Very Large Telescope in the K band. We use axisymmetric orbit models to determine the mass of the SMBH in the centre of Fornax A. The three-dimensional nature of our data provides the possibility to directly test the consistency of the data with axisymmetry by modelling each of the four quadrants separately. According to our dynamical models, consistent SMBH masses and dynamical Ks band mass-to-light ratios are obtained for all quadrants, with <M_BH>=1.3x10^8 M_\odot (rms(M_BH)=0.4x10^8 Msun) and <M/L>=0.68 (rms(M/L)=0.03), confirming the assumption of axisymmetry. For the folded and averaged data we find M_BH=(1.5+0.75-0.8)x10^8 Msun and M/L=(0.65+0.075-0.05) (3-sigma errors). Thus the black-hole mass of Fornax A is consistent within the error with the Tremaine (2002) M-sigma relation, but is a factor ~4 smaller than expected from its bulge mass and the Marconi&Hunt (2003) relation.

24 pages, 24 figures, submitted to MNRAS

References in corpus (16)

• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• A Close Look at Star Formation around Active Galactic Nuclei
• The Star-Forming Torus and Stellar Dynamical Black Hole Mass in the Seyfert 1 Nucleus of NGC3227
• Dynamical modelling of luminous and dark matter in 17 Coma early-type galaxies
• The central parsecs of Centaurus A: High Excitation Gas, a Molecular Disk, and the Mass of the Black Hole
• The SAURON project - XI. Stellar Populations from Absorption Line Strength Maps of 24 Early-Type Spirals
• SINFONI adaptive optics integral field spectroscopy of the Circinus Galaxy
• The Self-Regulated Growth of Supermassive Black Holes
• A New Approach to the Study of Stellar Populations in Early-Type Galaxies: K-band Spectral Indices and an Application to the Fornax Cluster
• The Black Hole Mass and Extreme Orbital Structure in NGC1399
• The supermassive black hole in NGC4486a detected with SINFONI at the VLT
• Axisymmetric orbit models of N-body merger remnants: a dependency of reconstructed mass on viewing angle
• A new stellar library in the region of the CO index at 2.3 $\mu$m. New index definition and empirical fitting functions
• S0 galaxies in Fornax: data and kinematics
• Central K-band kinematics and line strength maps of NGC 1399
• Spatially resolved spectroscopy of Coma cluster early-type galaxies IV. Completing the dataset

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