Can Star-Disk Collisions Explain the Missing Red Giants Problem in the Galactic Center?

Abstract

Observations have revealed a relative paucity of red giant (RG) stars within the central 0.5pc in the Galactic Center (GC). Motivated by this finding we investigate the hypothesis that collisions of stars with a fragmenting accretion disk are responsible for the observed dearth of evolved stars. We use 3-dimensional hydrodynamic simulations to model a star with radius $10R_{\odot }$ and mass $1M_{\odot }$, representative of the missing population of RGs, colliding with high density clumps. We find that multiple collisions with clumps of column density $\gtrsim 10^8\mathrm{g}\mathrm{c}{\mathrm{m}}^{-2}$ can strip a substantial fraction of the star's envelope and in principle render it invisible to observations. Simulations confirm that repeated impacts are particularly efficient in driving mass loss as partially stripped RGs expand and have increased cross sections for subsequent collisions. Because the envelope is unbound on account of the kinetic energy of the star, any significant amount of stripping of the RG population in the GC should be mirrored by a systematic decay of their orbits and possibly by their enhanced rotational velocity. To be viable, this scenario requires that the total mass of the fragmenting disk has been several orders of magnitude higher than that of the early type stars which now form the stellar disk in the GC.

arXiv comment15 pages, 11 figures, accepted for publication in ApJ

References in corpus (44)

• Monitoring stellar orbits around the Massive Black Hole in the Galactic Center
• Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits
• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• Stellar Orbits Around the Galactic Center Black Hole
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
• Stellar disk in the galactic center -- a remnant of a dense accretion disk?
• An Extremely Top-Heavy IMF in the Galactic Center Stellar Disks
• A Disk of Young Stars at the Galactic Center as Determined by Individual Stellar Orbits
• Starbursts near supermassive black holes: young stars in the Galactic Center, and gravitational waves in LISA band
• Evidence for Warped Disks of Young Stars in the Galactic Center
• The nuclear star cluster of the Milky Way: proper motions and mass
• Precise radial velocities of giant stars. III. Spectroscopic stellar parameters
• Dissipationless Formation and Evolution of the Milky Way Nuclear Star Cluster
• Properties of the Remnant Clockwise Disk of Young Stars in the Galactic Center
• High angular resolution integral-field spectroscopy of the Galaxy's nuclear cluster: a missing stellar cusp?
• The Tidal Disruption of Giant Stars and Their Contribution to the Flaring Supermassive Black Hole Population
• Collapse of a molecular cloud core to stellar densities: stellar core and outflow formation in radiation magnetohydrodynamics simulations
• The ecology of star clusters and intermediate mass black holes in the Galactic bulge
• Kinematics of the old stellar population at the Galactic Center
• The distribution of stars near the super-massive black hole in the Galactic Center
• Dynamical Friction on Star Clusters near the Galactic Center
• Long-term evolution of massive black hole binaries. IV. Mergers of galaxies with collisionally relaxed nuclei
• The Magnetohydrodynamics of Shock-Cloud Interaction in Three Dimensions
• Red giant stellar collisions in the Galactic Centre
• Evolution of Galactic Nuclei. I. orbital evolution of IMBH
• Red giant collisions in the galactic centre
• Magnetohydrodynamic Simulations of Shock Interactions with Radiative Clouds
• X-ray flares from Sgr A*: star-disk interactions?
• Tracing intermediate-mass black holes in the Galactic Centre
• Self-gravitating fragmentation of eccentric accretion disks
• Disruption of a Red Giant Star by a Supermassive Black Hole and the Case of PS1-10jh
• Quasi-Periodic Flares from Star-Accretion Disc Collisions
• Mapping the Outer Edge of the Young Stellar Cluster in the Galactic Center
• The role of the central stellar cluster in active galactic nuclei. I. Semi-analytical model
• Orbital decay of satellites crossing an accretion disc
• Bubble-Wrap for Bullets: The Stability Imparted By A Thin Magnetic Layer
• Relativistic effects in the tidal interaction between a white dwarf and a massive black hole in Fermi normal coordinates
• The fragmenting past of the disk at the Galactic Center : The culprit for the missing red giants
• Red giant-disk encounters: Food for quasars?
• On the dissolution of star clusters in the Galactic centre. I. Circular orbits
• The Extraordinary Abundances of QSO Broad Absorption Line Regions: A Matter of Novae?
• Young stars in the Galactic Centre: a potential intermediate-mass star origin
• Ejection of Hyper-Velocity Stars from the Galactic Centre by Intermediate-Mass Black Holes

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• The distribution of old stars around the Milky Way's central black hole I: Star counts
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• Asymmetric Dark Matter Imprint on Low-mass Main-sequence Stars in the Milky Way Nuclear Star Cluster
• A hadronic emission model for black hole-disc impacts in the blazar OJ 287
• Making Bright Giants Invisible At The Galactic Centre
• A spectroscopic map of the Galactic centre -- Observations and resolved stars
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• Red giant - jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits
• Missing bright red giants in the Galactic center: A fingerprint of its once active state?