We propose that the inner engine of a type I binary-driven hypernova (BdHN) is composed of Kerr black hole (BH) in a non-stationary state, embedded in a uniform magnetic field B 0 aligned with the BH rotation axis and surrounded by an ionized plasma of extremely low density of 10-14 g cm-3. Using GRB 130427A as a prototype, we show that this inner engine acts in a sequence of elementary impulses. Electrons accelerate to ultrarelativistic energy near the BH horizon, propagating along the polar axis, θ = 0, where they can reach energies of ∼1018 eV, partially contributing to ultrahigh-energy cosmic rays. When propagating with ="$ heta e 0$" SRC="apjab4ce6ieqn1.gif"/> through the magnetic field B 0, they produce GeV and TeV radiation through synchroton emission. The mass of BH, M = 2.31M o˙, its spin, α = 0.47, and the value of magnetic field B 0 = 3.48 1010 G, are determined self consistently to fulfill the energetic and the transparency requirement. The repetition time of each elementary impulse of energy ="${ mathcal E }sim {10}^{37}$" SRC="apjab4ce6ieqn2.gif"/> erg is ∼10-14 s at the beginning of the process, then slowly increases with time evolution. In principle, this "inner engine" can operate in a gamma-ray burst (GRB) for thousands of years. By scaling the BH mass and the magnetic field, the same inner engine can describe active galactic nuclei.
On the GeV Emission of the Type i BdHN GRB 130427A
Cherubini C;Filippi S;
2019-01-01
Abstract
We propose that the inner engine of a type I binary-driven hypernova (BdHN) is composed of Kerr black hole (BH) in a non-stationary state, embedded in a uniform magnetic field B 0 aligned with the BH rotation axis and surrounded by an ionized plasma of extremely low density of 10-14 g cm-3. Using GRB 130427A as a prototype, we show that this inner engine acts in a sequence of elementary impulses. Electrons accelerate to ultrarelativistic energy near the BH horizon, propagating along the polar axis, θ = 0, where they can reach energies of ∼1018 eV, partially contributing to ultrahigh-energy cosmic rays. When propagating with ="$ heta e 0$" SRC="apjab4ce6ieqn1.gif"/> through the magnetic field B 0, they produce GeV and TeV radiation through synchroton emission. The mass of BH, M = 2.31M o˙, its spin, α = 0.47, and the value of magnetic field B 0 = 3.48 1010 G, are determined self consistently to fulfill the energetic and the transparency requirement. The repetition time of each elementary impulse of energy ="${ mathcal E }sim {10}^{37}$" SRC="apjab4ce6ieqn2.gif"/> erg is ∼10-14 s at the beginning of the process, then slowly increases with time evolution. In principle, this "inner engine" can operate in a gamma-ray burst (GRB) for thousands of years. By scaling the BH mass and the magnetic field, the same inner engine can describe active galactic nuclei.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
