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The Stream-Stream Collision after the Tidal Disruption of a Star Around a Massive Black Hole by Kim, Sungsoo S.; Park, Myeong-Gu; Lee, Hyung Mok is a scholarly article available to read on EtoBox.

What is The Stream-Stream Collision after the Tidal Disruption of a Star Around a Massive Black Hole about?

A star can be tidally disrupted around a massive black hole. It has been known that the debris forms a precessing stream, which may collide with itself. The stream collision is a key process determining the subsequent evolution of the stellar debris: if the orbital energy is efficiently dissipated, the debris will eventually form a circular disk (or torus). In this paper, we have numerically studied such stream collision resulting from the encounter between a 10^6 Msun black hole and a 1 Msun normal star with a pericenter radius of 100 Rsun. A simple treatment for radiative cooling has been adopted for both optically thick and thin regions. We have found that approximately 10 to 15% of the initial kinetic energy of the streams is converted into thermal energy during the collision. The angular momentum of the incoming stream is increased by a factor of 2 to 3, and such increase, together with the decrease in kinetic energy, significantly helps the circularization process. Initial luminosity burst due to the collision may reach as high as 10^41 erg/sec in 10^4 sec, after which the luminosity increases again (but slowly this time) to a steady value of a few 10^40 erg/sec in a few time

Author

Kim, Sungsoo S.; Park, Myeong-Gu; Lee, Hyung Mok

Published

1999

Language

EN