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| DOI | 10.1093/MNRAS/STU1483 | ||||
| Año | 2014 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
It is often assumed that the strong gravitational field of a super-massive black hole disrupts an adjacent molecular cloud preventing classical star formation in the deep potential well of the black hole. Yet, young stars have been observed across the entire nuclear star cluster of the Milky Way including the region close (<0.5 pc) to the central black hole, Sgr A*. Here, we focus particularly on small groups of young stars, such as IRS 13N located 0.1 pc away from Sgr A*, which is suggested to contain about five embedded massive young stellar objects (<1 Myr). We perform three-dimensional hydrodynamical simulations to follow the evolution of molecular clumps orbiting about a 4 x 10(6) M-circle dot black hole, to constrain the formation and the physical conditions of such groups. The molecular clumps in our models are assumed to be isothermal containing 100 M-circle dot in <0.2 pc radius. Such molecular clumps exist in the circumnuclear disc of the Galaxy. In our highly eccentrically orbiting clump, the strong orbital compression of the clump along the orbital radius vector and perpendicular to the orbital plane causes the gas densities to increase to values higher than the tidal density of Sgr A*, which are required for star formation. Additionally, we speculate that the infrared excess source G2/DSO approaching Sgr A* on a highly eccentric orbit could be associated with a dust-enshrouded star that may have been formed recently through the mechanism supported by our models.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Jalali, B. | - |
Univ Cologne - Alemania
University of Cologne - Alemania Universität zu Köln - Alemania |
| 2 | Pelupessy, F. I. | - |
Leiden Univ - Países Bajos
Leiden Observatory Research Institute - Países Bajos Sterrewacht Leiden - Países Bajos |
| 3 | Eckart, A. | Hombre |
Univ Cologne - Alemania
Max Planck Inst Radioastron - Alemania University of Cologne - Alemania Max Planck Institute for Radio Astronomy - Alemania Universität zu Köln - Alemania |
| 4 | Zwart, S. Portegies | Hombre |
Leiden Univ - Países Bajos
Sterrewacht Leiden - Países Bajos |
| 4 | Portegies Zwart, S. | Hombre |
Leiden Observatory Research Institute - Países Bajos
Leiden Univ - Países Bajos Sterrewacht Leiden - Países Bajos |
| 5 | Sabha, N. | - |
Univ Cologne - Alemania
Max Planck Inst Radioastron - Alemania University of Cologne - Alemania Max Planck Institute for Radio Astronomy - Alemania Universität zu Köln - Alemania |
| 6 | Borkar, A. | - |
Univ Cologne - Alemania
Max Planck Inst Radioastron - Alemania University of Cologne - Alemania Max Planck Institute for Radio Astronomy - Alemania Universität zu Köln - Alemania |
| 7 | Moultaka, J. | - |
Univ Toulouse 3 - Francia
Universite Paul Sabatier Toulouse III - Francia Université Toulouse III - Paul Sabatier - Francia |
| 8 | Muzic, K. | Mujer |
ESO - Chile
European Southern Observatory Santiago - Chile Observatorio Europeo Austral - Chile |
| 9 | Moser, L. | Mujer |
Univ Cologne - Alemania
University of Cologne - Alemania Universität zu Köln - Alemania |
| Fuente |
|---|
| European Union |
| DFG |
| Seventh Framework Programme |
| Max Planck Society |
| Deutsche Forschungsgemeinschaft (DFG) |
| Netherlands Research School for Astronomy (NOVA) |
| DFG via the Cologne Bonn Graduate School (BCGS) |
| Netherlands Research Council NWO |
| University of Cologne through the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics |
| Agradecimiento |
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| We acknowledge the anonymous referee for the constructive comments that helped clarifying the manuscript. We thank the regional computing centre of the University of Cologne (RRZK) for providing computing time on the Deutsche Forschungsgemeinschaft (DFG) funded High Performance Computing (HPC) system CHEOPS. This work was also supported by the Netherlands Research Council NWO (grants #643.000.803 [Is Fast], #639.073.803 [VICI], #614.061.608 [AMUSE] and #612.071.305 [LGM]), by the Netherlands Research School for Astronomy (NOVA). BJ is grateful to Volker Winkelmann kind support at the HPC centre, and to Arjen Elteren and Nathan de Vries friendly help on the AMUSE installation and its functionality issues. BJ thanks Fatemeh Motalebi for helping on Fig. 1 visualization to be as informative as possible. We thank Mattew Horrobin for English revision. This work was supported in part by the DFG via the Cologne Bonn Graduate School (BCGS), and via grant SFB 956, as well as by the Max Planck Society and the University of Cologne through the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics. We had fruitful discussions with members of the European Union funded COST Action MP0905: Black Holes in a violent Universe and the COST Action MP1104: Polarization as a tool to study the Solar System and beyond. We received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 312789. |