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The probability of forming hyperveloicty stars in the Galaxy

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Abstract

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 106 M ⊙ and 3.4 × 106 M ⊙. 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.

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Authors and Affiliations

  1. B. N. Yeltsin Ural Federal University, Ekaterinburg, Russia

    G. N. Dremova & V. V. Dremov

  2. Saint-Petersburg State University, St. Petersburg, Russia

    V. V. Orlov & K. S. Shirokova

  3. Main (Pulkovo) Astronomical Observatory, Russian Academy of Sciences, St. Petersburg, Russia

    V. V. Orlov & K. S. Shirokova

  4. Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, Russia

    A. V. Tutukov

Authors
  1. G. N. Dremova
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  2. V. V. Dremov
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  3. V. V. Orlov
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  4. A. V. Tutukov
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  5. K. S. Shirokova
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Correspondence to G. N. Dremova.

Additional information

Original Russian Text © G.N. Dremova, V.V. Dremov, V.V. Orlov, A.V. Tutukov, K.S. Shirokova, 2015, published in Astronomicheskii Zhurnal, 2015, Vol. 92, No. 11, pp. 907–924.

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Dremova, G.N., Dremov, V.V., Orlov, V.V. et al. The probability of forming hyperveloicty stars in the Galaxy. Astron. Rep. 59, 1019–1035 (2015). https://doi.org/10.1134/S1063772915110037

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  • DOI: https://doi.org/10.1134/S1063772915110037

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