The probability of forming hyperveloicty stars in the Galaxy
| Autor: | V. V. Dremov, Alexander V. Tutukov, K. S. Shirokova, G. N. Dremova, Victor V. Orlov |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Supermassive black hole Intergalactic star Astrophysics::High Energy Astrophysical Phenomena Galactic Center X-ray binary Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Binary black hole Space and Planetary Science Binary star Satellite galaxy Astrophysics::Solar and Stellar Astrophysics Stellar black hole Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Astronomy Reports. 59:1019-1035 |
| ISSN: | 1562-6881 1063-7729 |
| Popis: | The probability of forming a Galactic hypervelocity star is estimated for the scenario of Hills, which describes the dynamical capture of one component of a binary star by the gravitational field of the supermassive black hole in the Galactic center, leading to the ejection of the other component. Ten thousand initial orientations of the binary orbits were considered, and the semi-major axes of the binary orbits were varied in a wide range from 11.3 R⊙ to 425 R⊙. Two series of computations were carried out, in which the mass of the supermassive black hole was taken to be 106M⊙ and 3.4 × 106M⊙. Numerical simulations of encounters of the binary and black hole in the framework of the three-body and N-body problems are used to localize regions favorable for the formation of hypervelocity stars. The motion of the ejected star in the regular field of the Galaxy is calculated, and the conditions under which the star escapes the Galaxy defined. The probability of escaping the Galaxy is caluclated as a function of various parameters the initial separation of the binary components and the distance of the binary from the black hole. On average, the probability of forming a hypervelocity star is higher for closer encounters and more tightly bound binary pairs. |
| Databáze: | OpenAIRE |
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