The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center

Abstract

We analyze deep near-IR adaptive optics imaging as well as new proper motion data of the nuclear star cluster of the Milky Way. The surface density distribution of faint stars peaks within 0.2" of the black hole candidate SgrA*. The radial density distribution of this stellar 'cusp' follows a power law of exponent 1.3-1.4. The K-band luminosity function of the overall nuclear stellar cluster (within 9" of SgrA*) resembles that of the large scale, Galactic bulge, but shows an excess of stars at K<14. We find that most of the massive early type stars at distances 1-10" from SgrA* are located in two rotating and geometrically thin disks. These disks are inclined at large angles and counter-rotate with respect to each other. Their stellar content is essentially the same, indicating that they formed at the same time. The star closest to SgrA* in 2002, S2, exhibits a 3.8 micron excess. We propose that the mid-IR emission either comes from the accretion flow around the black hole itself, or from dust in the accretion flow that is heated by the ultra-violet emission of S2.

arXiv comment59 pages, 18 figures

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• Stellar cusp and warm dust at the heart of NGC1068
• Adaptive Optics: Observations and Prospects for Studies of Active Galactic Nuclei
• Close stars and accretion in Low Luminosity Active Galactic Nuclei
• Intrinsically Polarized Stars and Implication for Star Formation in the Central Parsec of Our Galaxy
• Magnetic-Reconnection and Current-Sheet Model for the Radio Arc and Threads in the Galactic Center
• A conservation-based method for simulating the inspiral of binary black holes
• $G$ Objects and primordial black holes
• Model Atmospheres for Irradiated Giant Stars: Implications for the Galactic Center
• A comprehensive X-ray view of the active nucleus in NGC 4258
• Low angular momentum flow model of Sgr A* activity
• Resonant Relaxation near the Massive Black Hole in the Galactic Center
• Nuclear Spirals as Signatures of Supermassive Black Holes
• Massive perturbers in the galactic center
• Probing the formation of planetesimals in the Galactic Centre using Sgr A* flares
• Sgr A* as probe of the theory of supermassive compact objects without event horizon
• Study of the Science Capabilities of PRIMA in the Galactic Center
• Adaptive Optics Observations of the Galactic Center Young Stars
• Black Holes Admitting Strong Resonant Phenomena
• Self-consistent Solutions of Evolving Nuclear Star Clusters with Two-Dimensional Monte-Carlo Dynamical Simulations
• Galaxy dynamics tracing quantum cosmology beyond $\Lambda$CDM below the de Sitter scale of acceleration
• MOLsphere and pulsations of the Galactic Center's red supergiant GCIRS 7 from VLTI/GRAVITY
• The AGN Jet Model of the Fermi Bubbles
• Star formation in the central 0.5 pc of the Milky Way
• Accelerations of stars in central 2-7 arcsec from Sgr A*
• A study of the central stellar populations of galaxies in SDSS-IV MaNGA: identification of a sub-sample with unusually young and massive stars
• Black holes: from stars to galaxies
• Deformation of the Galactic Centre stellar cusp due to the gravity of a growing gas disc
• 21cm Absorption by Compact Hydrogen Disks Around Black Holes in Radio-Loud Nuclei of Galaxies
• Hydrodynamical simulations of a compact source scenario for G2
• LIINUS/SERPIL: a design study for interferometric imaging spectroscopy at the LBT
• The Near-Infrared Spectrum of the Nuclear Star Cluster: Looking Below the Tip of the Iceberg and Comparisons with Extragalactic Nuclei
• Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*
• The Galactic Center
• Observational constraints on the formation and evolution of the Milky Way nuclear star cluster with Keck and Gemini
• Gas Inflow and Star Formation near Supermassive Black Holes: The Role of Nuclear Activity
• Chandra Observations of Galactic Center: High Energy Processes at Arcsecond Resolution
• Disks of Stars in the Galactic center triggered by Tidal Disruption Events
• Photometric Constraints on Intermediate-mass Black Holes in the Galactic Centre
• Merger of Black Holes in the Galactic Center
• Unveiling the Massive Stars in the Galactic Center
• An Ingot-like class of WaveFront Sensors for Laser Guide Stars
• Supernovae Light Curves: An Argument for a New Distance Modulus
• The Fate of Binary Stars Hosting Planets upon Interaction with Sgr A* Black hole
• Simulations of the formation of a gaseous disc and young stars near Sgr A* via cloud-cloud collisions
• NACO/SAM observations of sources at the Galactic Center
• LIINUS/SERPIL: a design study for interferometric imaging spectroscopy at the LBT
• Top-heavy stellar mass distribution in galactic nuclei inferred from the universally high abundance ratio of [Fe/Mg]
• Binary Dynamics and Mergers in a Stellar Disk and the Formation of Dusty Objects in the Galactic Center
• Composition of the galactic center star cluster: Population analysis from adaptive optics narrow band spectral energy distributions
• Using the Hills Mechanism to Generate Repeating Partial Tidal Disruption Events and ASASSN-14ko
• A New Bayesian Test to test for the Intractability-Countering Hypothesis
• A cyclic universe with colour fields
• Black Hole Survival Guide: Searching for Stars in the Galactic Center That Endure Partial Tidal Disruption
• Black Hole Motion as Catalyst of Orbital Resonances
• Ejection of Hyper-Velocity Stars from the Galactic Centre by Intermediate-Mass Black Holes