Weighing the young stellar discs around Sgr A*
arXiv:astro-ph/0511830 · doi:10.1111/j.1365-2966.2005.09906.x
Abstract
It is believed that young massive stars orbiting Sgr A* in two stellar discs on scales of 0.1-0.2 parsecs were formed either farther out in the Galaxy and then quickly migrated inward, or in situ in a massive self-gravitating disc. Comparing N-body evolution of stellar orbits with observational constraints, we set upper limits on the masses of the two stellar systems. These masses turn out to be few times lower than the expected total stellar mass estimated from the observed young high-mass stellar population and the standard galactic IMF. If these stars were formed in situ, in a massive self-gravitating disc, our results suggest that the formation of low-mass stars was suppressed by a factor of at least a few, requiring a top-heavy initial mass function (IMF) for stars formed near sgr A*.
accepted to MNRAS. 6 pages, 5 figures
References in corpus (18)
- Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
- Stellar Orbits Around the Galactic Center Black Hole
- The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
- SINFONI in the Galactic Center: young stars and IR flares in the central light month
- The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center
- Selfgravity and QSO disks
- Stellar disk in the galactic center -- a remnant of a dense accretion disk?
- A Hierarchical O(N) Force Calculation Algorithm
- The Galactic Center He I Stars: Remains of a Dissolved Young Cluster?
- The "missing" YSOs in the central parsec of the Galaxy: evidence for star formation in a massive accretion disk and a top-heavy IMF
- Self-gravitating accretion disk in Sgr A* few million years ago: was Sgr A* a failed quasar?
- Dynamical Friction on Star Clusters near the Galactic Center
- The Link between Warm Molecular Disks in Maser Nuclei and Star Formation near the Black Hole at the Galactic Center
- 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
- Warped accretion disks and the unification of Active Galactic Nuclei
- Intermediate-mass Black Hole and stellar orbits in the Galactic Center
Cited by in corpus (50)
- The Galactic Center Massive Black Hole and Nuclear Star Cluster
- The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
- Gravitational waves from scattering of stellar-mass black holes in galactic nuclei
- Radiative feedback from massive black holes in elliptical galaxies. AGN flaring and central starburst fueled by recycled gas
- A Disk of Young Stars at the Galactic Center as Determined by Individual Stellar Orbits
- Stellar Populations in the Central 0.5 pc of the Galaxy II: The Initial Mass Function
- Evidence for Warped Disks of Young Stars in the Galactic Center
- The structure of the nuclear stellar cluster of the Milky Way
- Resonant relaxation near a massive black hole: the stellar distribution and gravitational wave sources
- Simulations of star formation in a gaseous disc around sgr A* - a failed AGN
- Feedback from central black holes in elliptical galaxies. I: models with either radiative or mechanical feedback but not both
- Resonant relaxation and the warp of the stellar disc in the Galactic centre
- Stellar Evolution in AGN Disks
- Convective cooling and fragmentation of gravitationally unstable disks
- Simulations of the formation of stellar discs in the Galactic centre via cloud-cloud collisions
- Near-infrared proper motions and spectroscopy of infrared excess sources at the Galactic Center
- Fermi Bubbles in the Milky Way: the closest AGN feedback laboratory courtesy of Sgr A*?
- The effect of stellar feedback on the formation and evolution of gas and dust tori in AGN
- Enhanced activity of massive black holes by stellar capture assisted by a self-gravitating accretion disc
- Massive stars in sub-parsec rings around galactic centers
- Production of Hypervelocity Stars through Encounters with Stellar-Mass Black Holes in the Galactic Centre
- Clockwise Stellar Disk and the Dark Mass in the Galactic Center
- Gas dynamics of the central few parsec region of NGC 1068 fuelled by the evolving nuclear star cluster
- Star formation in accretion discs : from the Galactic Center to Active Galactic Nuclei
- Self-gravitating fragmentation of eccentric accretion disks
- Constraints on the Stellar Mass Function from Stellar Dynamics at the Galactic Center
- Simulations of Direct Collisions of Gas Clouds with the Central Black Hole
- A new type of compact stellar population: dark star clusters
- Stellar dynamical evidence against a cold disc origin for stars in the Galactic Centre
- Cluster Core Dynamics at the Galactic Center
- Influence of a stellar cusp on the dynamics of young stellar discs and the origin of the S-stars in the Galactic Centre
- Constraining the initial mass function of stars in the Galactic Centre
- IRS 13N: a new comoving group of sources at the Galactic Center
- VLT Spectroscopy of Globular Clusters in Low Surface Brightness Dwarf Galaxies
- On the number of young stellar discs in the Galactic Centre
- The Effectiveness of the Kozai Mechanism in the Galactic Centre
- On the origin of kinematic distribution of the sub-parsec young stars in the Galactic center
- Eccentric disc instability in stellar discs formed from inspiraling gas clouds in the Galactic Centre
- Spin Evolution of Supermassive Black Holes and Galactic Nuclei
- Two-body relaxation driven evolution of the young stellar disc in the Galactic Centre
- Are SMBHs shrouded by "super-Oort" clouds of comets and asteroids?
- Secular Evolution Driven by Massive Eccentric Disks/Rings: An Apsidally Aligned Case
- Rich Kozai-Lidov Dynamics in an Initially Thin and Eccentric Stellar Disc Around a Supermassive Black Hole
- On the possibility of a warped disc origin of the inclined stellar discs at the Galactic Centre
- Constraints on jet-driven disk accretion in Sagittarius A*
- Sculpting the Stellar Cusp in the Galactic Center
- Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*
- Simulations of the formation of a gaseous disc and young stars near Sgr A* via cloud-cloud collisions
- News from the year 2006 Galactic Center workshop
- Revisiting the Evolutionary Status of Massive Stars at the central parsec of the Milky Way