The supermassive black hole and double nucleus of the core elliptical NGC5419

Abstract

We obtained adaptive-optics assisted SINFONI observations of the central regions of the giant elliptical galaxy NGC5419 with a spatial resolution of 0.2 arcsec ($\approx 55$ pc). NGC5419 has a large depleted stellar core with a radius of 1.58 arcsec (430 pc). HST and SINFONI images show a point source located at the galaxy's photocentre, which is likely associated with the low-luminosity AGN previously detected in NGC5419. Both the HST and SINFONI images also show a second nucleus, off-centred by 0.25 arcsec ($\approx 70$ pc). Outside of the central double nucleus, we measure an almost constant velocity dispersion of $\sigma \sim 350$ km/s. In the region where the double nucleus is located, the dispersion rises steeply to a peak value of $\sim 420$ km/s. In addition to the SINFONI data, we also obtained stellar kinematics at larger radii from the South African Large Telescope. While NGC5419 shows low rotation ($v<50$ km/s), the central regions (inside $\sim 4r_b$) clearly rotate in the opposite direction to the galaxy's outer parts. We use orbit-based dynamical models to measure the black hole mass of NGC5419 from the kinematical data outside of the double nuclear structure. The models imply M${}_{\mathrm{BH}}=7.2_{-1.9}^{+2.7}\times 10^9$ M${}_{\odot }$. The enhanced velocity dispersion in the region of the double nucleus suggests that NGC5419 possibly hosts two supermassive black holes at its centre, separated by only $\approx 70$ pc. Yet our measured M${}_{\mathrm{BH}}$ is consistent with the black hole mass expected from the size of the galaxy's depleted stellar core. This suggests, that systematic uncertainties in M${}_{\mathrm{BH}}$ related to the secondary nucleus are small.

arXiv commentAccepted for publication in MNRAS

References in corpus (64)

• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• Evolutionary population synthesis: models, analysis of the ingredients and application to high-z galaxies
• Nuclear Activity in Nearby Galaxies
• Stellar population models of Lick indices with variable element abundance ratios
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• The Centers of Early-Type Galaxies with HST. IV. Central Parameter Relations
• The Atlas3D project - XV. Benchmark for early-type galaxies scaling relations from 260 dynamical models: mass-to-light ratio, dark matter, Fundamental Plane and Mass Plane
• Discovery of a binary AGN in the ultraluminous infrared galaxy NGC 6240 using Chandra
• Formation of Galactic Nuclei
• A Close Look at Star Formation around Active Galactic Nuclei
• A Compact Supermassive Binary Black Hole System
• Dynamical Friction and Galaxy Merging Timescales
• Axisymmetric Dynamical Models of the Central Regions of Galaxies
• The Centers of Early-Type Galaxies with HST. V. New WFPC2 Photometry
• The SINFONI Black Hole Survey: The Black Hole Fundamental Plane revisited and the paths of (co-) evolution of supermassive black holes and bulges
• The Density Profiles of Massive, Relaxed Galaxy Clusters. I. The Total Density Over Three Decades in Radius
• A New Empirical Model for the Structural Analysis of Early-type Galaxies and a Critical Review of the Nuker Model
• Axisymmetric, 3-Integral Models of Galaxies: A Massive Black Hole in NGC3379
• HST STIS spectroscopy of the triple nucleus of M31: two nested disks in Keplerian rotation around a Supermassive Black Hole
• Masses of star clusters in the nuclei of bulge-less spiral galaxies
• Evolutionary synthesis of stellar populations: a modular tool
• Evidence for a New Elliptical-Galaxy Paradigm: Sersic and Core Galaxies
• A method to remove residual OH emission from near infrared spectra
• Mass Deficits, Stalling Radii, and the Merger Histories of Elliptical Galaxies
• Gravitational Recoil From Accretion-Aligned Black-Hole Binaries
• An Eccentric Disk Model for the Nucleus of M31
• Chandra unveils a binary Active Galactic Nucleus in Mrk463
• Correlations Between Supermassive Black Holes, Velocity Dispersions, and Mass Deficits in Elliptical Galaxies with Cores
• Arp 299: a second merging system with two active nuclei?
• Dissipation and Extra Light in Galactic Nuclei: III. 'Core' Ellipticals and 'Missing' Light
• A 17-billion-solar-mass black hole in a group galaxy with a diffuse core
• Composite Bulges: The Coexistence of Classical Bulges and Disky Pseudobulges in S0 and Spiral Galaxies
• Extragalactic Globular Clusters in the Near-Infrared II. The Globular Clusters Systems of NGC 3115 and NGC 4365
• Chandra Discovery of a Binary Active Galactic Nucleus in Mrk 739
• Estimating Black Hole Masses in Triaxial Galaxies
• Mapping stationary axisymmetric phase-space distribution functions by orbit libraries
• Central mass-to-light ratios and dark matter fractions in early-type galaxies
• The Chandra view of the 3C/FRI sample of low luminosity radio-galaxies
• The Influence of Dark Matter Halos on Dynamical Estimates of Black Hole Mass: Ten New Measurements for High-sigma Early-Type Galaxies
• The old and heavy bulge of M31 I. Kinematics and stellar populations
• The star cluster system of the 3 Gyr old merger remnant NGC 1316: Clues from optical and near-infrared photometry
• A Kiloparsec-Scale Binary Active Galactic Nucleus Confirmed by the Expanded Very Large Array
• The Dynamical Fingerprint of Core Scouring in Massive Elliptical Galaxies
• Do black hole masses scale with classical bulge luminosities only? The case of the two composite pseudobulge galaxies NGC3368 and NGC3489
• Regularized orbit models unveiling the stellar structure and dark matter halo of the Coma elliptical NGC 4807
• Depleted Galaxy Cores and Dynamical Black Hole Masses
• Molecular gas in the centre of nearby galaxies from VLT/SINFONI integral field spectroscopy - I. Morphology and mass inventory
• IMF shape constraints from stellar populations and dynamics from CALIFA
• The central black hole mass of the high-sigma but low-bulge-luminosity lenticular galaxy NGC 1332
• The supermassive black hole of Fornax A
• The supermassive black hole in NGC4486a detected with SINFONI at the VLT
• Kinematical signatures of hidden stellar discs
• Measurement of the Black Hole Mass in NGC 1332 from ALMA Observations at 0.044 Arcsecond Resolution
• Recoiling Supermassive Black Holes: a search in the Nearby Universe
• Virgo Cluster and field dwarf ellipticals in 3D - II. Internal dynamics points to tidal harassment?
• An optical/NIR survey of globular clusters in early-type galaxies II. Ages of GC systems and the relation to galaxy morphology
• Analytical Solutions to the Mass-Anisotropy Degeneracy with Higher Order Jeans Analysis: A General Method
• Indication for an intermediate-mass black hole in the globular cluster NGC 5286 from kinematics
• The HST view of the nuclear emission line region in low luminosity radio-galaxies
• The Black Hole Mass in Brightest Cluster Galaxy NGC 6086
• Extragalactic Globular Clusters in the Near Infrared: III. NGC 5846 and NGC 7192
• Cores and the Kinematics of Early-Type Galaxies
• PKS B1400-33: an unusual radio relic in a poor cluster
• The dynamical structure of isotropic spherical galaxies with a central black hole

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