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Abstract
Discovery of two giant structures seen in gamma-rays and radio, located above and below the Galactic center, known as Fermi bubbles, can be considered as one of the most interesting phenomena observed by Fermi-LAT. Their position and total energy content suggest a very strong energy outburst happened in the Galactic center in the past. We point out some limitations of theoretical models of Fermi bubbles. We also discuss interconnection between Fermi bubbles and Galactic cosmic rays. In particular, we point out that gamma-ray emitting electrons in the bubbles are most likely originated from cosmic ray electrons. In addition we show that Fermi bubbles may be responsible for the formation of the spectrum of cosmic rays above the “knee”.
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Details
1 I.E.Tamm Theoretical Physics Division of P.N.Lebedev Institute of Physics, Leninskii pr. 53, 119991 Moscow, Russia
2 Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, China
3 Institute of Astronomy, Department of Physics and Center for Complex Systems, National Central University, Jhongli District, Taoyuan City, Taiwan 320, R.O.C.