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arXiv · 2611.09343

Activity of the ejected galactic nuclei and cosmic rays

Yu. N. Eroshenko
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Abstract

The double and triple approaches of supermassive central black holes are a fairly common process in the hierarchical picture of galaxy formation. In this case, the ejection of a black hole is possible; it may carry the accretion disk and some amount of stars with it. The activity of the galactic nucleus can be restored after the ejection. One consequence of this activity is an ultrafast gas outflow, accompanied by a shock wave. We show that the acceleration of cosmic rays at such a shock is more effective than in the case of a stationary galactic nucleus due to the lower density of the surrounding gas and the higher velocity of the shock front. In this case, proton acceleration can occur up to energies of ~10^{19} eV, which is an order of magnitude higher than in an ordinary nucleus in the centers of galaxies.

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Yu. N. Eroshenko. 2026-11-06. Activity of the ejected galactic nuclei and cosmic rays. https://arxiv.org/abs/2611.09343

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