On the high-energy protons regular acceleration in the Fermi Bubbles

Abstract

We propose the model of the global structure of the electromagnetic fields in the Fermi bubbles (FBs), which makes possible the proton regular acceleration up to ultra-high energies. The poloidal and the toroidal magnetic fields, as well as the radial electric field, turn to have a structure similar to fields that exist in jets ejected out from active galactic nuclei (AGN). A powerful source of relativistic particles observed in the centre of the Galaxy and associated with the rotating supermassive black hole (SMBH) Sgr A* can energize the FB and keeps its active for a long time. The absence of accretion onto a BH and thus the absence of a relativistic jet does not mean that there is no loss of rotational energy of BH. In the case of FB, the energy lost by BH can keep the FB activity. The regular FBs structure could be formed by inheritance from a relativistic jet that presumably existed in the active past of the Galaxy $10^7$ years ago, or by processes near the Galaxy centre existing during the entire life cycle of the Galaxy. The acceleration of protons in electromagnetic fields of FB are found up to energies $E_{max}\simeq 10^{17}$ eV, which explains the observed radiation of FB in the gamma range, as well as the emission of high-energy neutrinos.

arXiv comment8 pages, 3 figures

References in corpus (27)

• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• Acceleration of petaelectronvolt protons in the Galactic Centre
• The Fermi Bubbles: Giant, Multi-Billion-Year-Old Reservoirs of Galactic Center Cosmic Rays
• Giant Magnetized Outflows from the Centre of the Milky Way
• The Fermi Bubbles: Supersonic AGN Jets with Anisotropic Cosmic Ray Diffusion
• Origin of the Fermi Bubble
• Galactic Neutrinos in the TeV to PeV Range
• Non-Thermal Insights on Mass and Energy Flows Through the Galactic Centre and into the Fermi Bubbles
• Evidence for Gamma-ray Jets in the Milky Way
• The Life Cycle of the Central Molecular Zone. I: Inflow, Star Formation, and Winds
• The Fermi Bubbles. II. The Potential Roles of Viscosity and Cosmic Ray Diffusion in Jet Models
• The Fermi Bubbles as Starburst Wind Termination Shocks
• An upper limit on the spin of SgrA${}^{\ast }$ based on stellar orbits in its vicinity
• Neutrino Events at IceCube and the Fermi Bubbles
• Simulating the Fermi Bubbles as Forward Shocks Driven by AGN Jets
• The Fermi Bubble as a Source of Cosmic Rays in the Energy Range > 10E15 eV
• Multi-wavelength Emission from the Fermi Bubble III. Stochastic (Fermi) Re-Acceleration of Relativistic Electrons Emitted by SNRs
• Formation of large-scale magnetic structures associated with the Fermi bubbles
• Multi-wavelength Emission from the Fermi Bubble II. Secondary Electrons and the Hadronic Model of the Bubble
• On the origin of galactic cosmic rays
• Multi-wavelength Emission from the Fermi Bubble I. Stochastic acceleration from Background Plasma
• High-energy neutrinos from cosmic ray interactions in the Local Bubble
• The Fermi bubbles from stochastic acceleration of electrons in a Galactic outflow
• Acceleration of high energy protons in AGN relativistic jets
• Analytical and numerical studies of central galactic outflows powered by tidal disruption events -- a model for the Fermi bubbles?
• Centrifugal acceleration of protons by a supermassive black hole
• Fermi bubbles as a source of cosmic rays above 10^{15} eV