3D AMR hydrosimulations of a compact-source scenario for the Galactic Centre cloud G2
| Autor: | Elizabeth George, Maryam Habibi, Stefan Gillessen, R. Genzel, P. M. Plewa, A. Ballone, Andreas Burkert, T. Ott, Marc Schartmann, Frank Eisenhauer, Oliver Pfuhl |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
010308 nuclear & particles physics Adaptive mesh refinement business.industry FOS: Physical sciences Astronomy Astronomy and Astrophysics Cloud computing Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Accretion (astrophysics) T Tauri star Compact space Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Outflow Astrophysics::Earth and Planetary Astrophysics business 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 479:5288-5302 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/sty1408 |
| Popis: | The nature of the gaseous and dusty cloud G2 in the Galactic Centre is still under debate. We present three-dimensional hydrodynamical adaptive mesh refinement (AMR) simulations of G2, modeled as an outflow from a "compact source" moving on the observed orbit. The construction of mock position-velocity (PV) diagrams enables a direct comparison with observations and allow us to conclude that the observational properties of the gaseous component of G2 could be matched by a massive ($\dot{M}_\mathrm{w}=5\times 10^{-7} \;M_{\odot} \mathrm{yr^{-1}}$) and slow ($50 \;\mathrm{km \;s^{-1}}$) outflow, as observed for T Tauri stars. In order for this to be true, only the material at larger ($>100 \;\mathrm{AU}$) distances from the source must be actually emitting, otherwise G2 would appear too compact compared to the observed PV diagrams. On the other hand, the presence of a central dusty source might be able to explain the compactness of G2's dust component. In the present scenario, 5-10 years after pericentre the compact source should decouple from the previously ejected material, due to the hydrodynamic interaction of the latter with the surrounding hot and dense atmosphere. In this case, a new outflow should form, ahead of the previous one, which would be the smoking gun evidence for an outflow scenario. resubmitted to MNRAS after referee report, 16 pages, 11 figures |
| Databáze: | OpenAIRE |
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