On the Formation of Compact Stellar Disks Around Sgr A*

Abstract

The recent identification of one or two sub-parsec disks of young, massive stars orbiting the ~4e6 solar mass black hole Sgr A* has prompted an "in-situ" scenario for star formation in disks of gas formed from a cloud captured from the Galactic center environment. To date there has been no explanation given for the low angular momentum of the disks relative to clouds passing close to the center. Here we show that the partial accretion of extended Galactic center clouds, such as the 50 km/s giant molecular cloud, that temporarily engulf Sgr A* during their passage through the central region of the Galaxy provide a natural explanation for the angular momentum and surface density of the the observed stellar disks. The captured cloud material is gravitationally unstable and forms stars as it circularizes, potentially explaining the large eccentricity and range of inclinations of the observed stellar orbits. The application of this idea to the formation of the circumnuclear ring is also discussed.

arXiv comment12 pages, 2 figs, minor changes, ApJ Letters accepted

References in corpus (22)

• The Proper Motion of Sgr A*: II. The Mass of Sgr A*
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center
• Stellar disk in the galactic center -- a remnant of a dense accretion disk?
• Stellar Dynamics in the Galactic centre: Proper Motions and Anisotropy
• Stellar dynamics in the central arcsecond of our galaxy
• A Review of Bondi--Hoyle--Lyttleton Accretion
• HCN and HCO+ Observations of the Galactic Circumnuclear Disk
• The Galactic Center He I Stars: Remains of a Dissolved Young Cluster?
• Simulations of star formation in a gaseous disc around sgr A* - a failed AGN
• Really Cool Stars and the Star Formation History at the Galactic Center
• Self-gravitating accretion disk in Sgr A* few million years ago: was Sgr A* a failed quasar?
• Evidence for a Long-Standing Top-Heavy IMF in the Central Parsec of the Galaxy
• The AST/RO Survey of the Galactic Center Region. I. The Inner 3 Degrees
• The proper motion of the Arches cluster with Keck Laser-Guide Star Adaptive Optics
• Dynamical Friction of Galactic Center Star Clusters with an Intermediate-Mass Black Hole
• The fate of star clusters near the Galactic center I: Analytic considerations
• The Disruption of Stellar Clusters Containing Massive Black Holes near the Galactic Center
• The Circumnuclear Material in the Galactic Centre: A Clue to the Accretion Process
• The origin of IRS 16: dynamically driven inspiral of a dense star cluster to the Galactic center?
• Resonant relaxation near a massive black hole: the dependence on eccentricity
• Full Three Dimensional Orbits For Multiple Stars on Close Approaches to the Central Supermassive Black Hole

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• The Galactic Center Massive Black Hole and Nuclear Star Cluster
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• Star Formation Around Super-Massive Black Holes
• Properties of the Remnant Clockwise Disk of Young Stars in the Galactic Center
• The evolution of active galactic nuclei and their spins
• Properties of gravitoturbulent accretion disks
• The 1.28 GHz MeerKAT Galactic Center Mosaic
• The Bolocam Galactic Plane Survey IV: 1.1 and 0.35 mm Dust Continuum Emission in the Galactic Center Region
• Simulations of the formation of stellar discs in the Galactic centre via cloud-cloud collisions
• KMOS view of the Galactic Centre I. Young stars are centrally concentrated
• Fossil imprint of a powerful flare at the Galactic Centre along the Magellanic Stream
• In situ formation of SgrA* stars via disk fragmentation: parent cloud properties and thermodynamics
• The High-Density Ionized Gas in the Central Parsec of the Galaxy
• Numerical simulations of the possible origin of the two sub-parsec scale and counter-rotating stellar disks around SgrA*
• Magnetically-levitating disks around supermassive black holes
• Simulations of Direct Collisions of Gas Clouds with the Central Black Hole
• Milky Way Supermassive Black Hole: Dynamical Feeding from the Circumnuclear Environment
• Dynamical constraints on the origin of the young B-stars in the Galactic center
• Massive Star Formation in the Molecular Ring Orbiting the Black Hole at the Galactic Center
• Misaligned streamers around a galactic centre black hole from a single cloud's infall
• A rapid evolving region in the Galactic Center: Why S-stars thermalize and more massive stars are missing
• ALMA Observations of the Galactic Center: SiO Outflows and High Mass Star Formation near Sgr A*
• Star Formation in the vicinity of Nuclear Black Holes: Young Stellar Objects close to Sgr A*
• Massive black holes in central cluster galaxies
• On the evolution of gas clouds exposed to AGN radiation. I. Three-dimensional radiation hydrodynamic simulations
• The fragmenting past of the disk at the Galactic Center : The culprit for the missing red giants
• On the origin of the B-stars in the Galactic center
• Molecular Gas Feeding the Circumnuclear Disk of the Galactic Center
• A Kiloparsec-Scale Nuclear Stellar Disk in the Milky Way as a Possible Explanation of the High Velocity Peaks in the Galactic Bulge
• The Galactic Center as a laboratory for theories of gravity and dark matter
• Angular Momentum and the Formation of Stars and Black Holes
• ALMA Detection of Bipolar Outflows: Evidence for Low Mass Star Formation within 1pc of Sgr A*
• Modelling the formation of the circumnuclear ring in the Galactic centre
• Star Formation and Dynamics in the Galactic Centre
• A Scaling Relation Between Megamaser Disk Radius and Black Hole Mass in Active Galactic Nuclei
• Eccentric disc instability in stellar discs formed from inspiraling gas clouds in the Galactic Centre
• Signatures of Young Star Formation Activity Within Two Parsecs of Sgr A*
• Physical Contact between the +20 km/s Cloud and the Galactic Circumnuclear Disk
• Perturbations induced by a molecular cloud on the young stellar disc in the Galactic Centre
• Forming circumnuclear disks and rings in galactic nuclei: a competition between supermassive black hole and nuclear star cluster
• The apparent tail of the Galactic center object G2/DSO
• Slicing the Torus: Obscuring Structures in Quasars
• Predicted Stellar Kinematics of a Kiloparsec-Scale Nuclear Disc (or Ring) in the Milky Way
• On the origin of the central 1" hole in the stellar disk of Sgr A* and the Fermi gamma-ray bubbles
• Galactic Centre star formation: the case of the missing gas disc
• Effects of turbulence in the Circumnuclear Disk
• Millimeter-wave Spectral Line Surveys toward the Galactic Circumnuclear Disk and Sgr A*
• Rich Kozai-Lidov Dynamics in an Initially Thin and Eccentric Stellar Disc Around a Supermassive Black Hole
• Evolution of eccentric stellar disks around supermassive black holes: the complex disk disruption dynamics and the milliparsec stars
• The Evaporating Massive Embedded Stellar Cluster IRS 13 Close to Sgr A*. II. Kinematic structure
• A common origin for the circumnuclear disc and the nearby molecular clouds in the Galactic Centre
• Sculpting the Stellar Cusp in the Galactic Center
• The connecting molecular ridge in the Galactic center
• Red giant - jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits
• The Origin of Parsec-Scale Gaseous and Stellar Disks in the Galactic Center and AGNs
• Gas Inflow and Star Formation near Supermassive Black Holes: The Role of Nuclear Activity
• Mass flows in the Galactic Center by supernovae of the circumnuclear disk
• The Origin of Keplerian Megamaser Disks
• Star Formation Close to Sgr A* and Beyond the Nuclear Cluster