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Speaker |
Fragione, Giacomo |
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Coauthors |
Capuzzo-Dolcetta, Roberto |
| Talk Title |
Massive galactic black holes and the origin of high- and hyper-velocity stars |
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Abstract |
In our Galaxy there is a population of high velocity and even hypervelocity stars (HVS, escaping from the Galaxy). Hills (1988) was the first to predict theoretically their existence as a consequence of interactions with a massive black hole (BH) in the Galactic centre. Their actual existence was later proved by Brown et al. (2005) observations. The most recent HVS Survey, the MMT, revealed 21 unbound HVS ejected from the Milky Way, at distances between 50-120 kpc. Hills' mechanism involves the tidal breakup of a binary star passing by a massive or even super massive BH. As counterpart, the tidal breakup could lead to a population of stars orbiting in the inner regions of the Galaxy around the central BH, the so-called S stars. Since Hills' prediction, a lot of mechanisms have been proposed to explain the production of such HVS, which involve different astrophysical components and phenomena. In this talk we will present the results of our investigation of another mechanism of HVS production, which involves a globular cluster passing close to a super massive BH in the central region of the hosting galaxy. |
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Talk view |
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