| Title: | Scrutinizing FR 0 radio galaxies as ultra-high-energy cosmic ray source candidates |
|---|
| Authors: | ID Merten, Lukas (Author)
ID Boughelilba, Margot (Author)
ID Reimer, Anita (Author)
ID Da Vela, Paolo (Author)
ID Vorobiov, Serguei (Author)
ID Tavecchio, Fabrizio (Author)
ID Bonnoli, Giacomo (Author)
ID Lundquist, Jon Paul (Author)
ID Righi, Chiara (Author) |
|---|
| Files: |
This document has no files that are freely available to the public. This document may have a physical copy in the library of the organization, check the status via COBISS.  |
|---|
| Language: | English |
|---|
| Work type: | Unknown |
|---|
| Typology: | 1.01 - Original Scientific Article |
|---|
| Organization: | UNG - University of Nova Gorica
|
|---|
| Abstract: | Fanaroff-Riley (FR) 0 radio galaxies compose a new class of radio galaxies, which are usually weaker but much more numerous than the well-established class of FR 1 and FR 2 galaxies. The latter classes have been proposed as sources of the ultra-high-energy cosmic rays (UHECRs) with energies reaching up to eV. Based on this conjecture, the possibility of UHECR acceleration and survival in an FR 0 source environment is examined in this work.
In doing so, an average spectral energy distribution (SED) based on data from the FR 0 catalog (FR0CAT) is compiled. The resulting photon fields are used as targets for UHECRs, which suffer from electromagnetic pair production, photo-disintegration, photo-meson production losses, and synchrotron radiation. Multiple mechanisms are discussed to assess the UHECR acceleration probability, including Fermi-I order and gradual shear accelerations, and particle escape from the source region.
This work shows that in a hybrid scenario, combining Fermi and shear accelerations, FR 0 galaxies can contribute to the observed UHECR flux, as long as where shear acceleration starts to dominate over escape. Even in less optimistic scenarios, FR 0s can be expected to contribute to the cosmic-ray flux between the knee and the ankle. Our results are relatively robust with respect to the realized magnetic turbulence model and the speed of the accelerating shocks. |
|---|
| Keywords: | acceleration of particles, nonthermal radiation mechanisms, jets, active galaxies, cosmic rays |
|---|
| Year of publishing: | 2021 |
|---|
| Number of pages: | str. 1-48 |
|---|
| Numbering: | Vol. , 1 |
|---|
| PID: | 20.500.12556/RUNG-6250 |
|---|
| COBISS.SI-ID: | 50457091 |
|---|
| UDC: | 539.1 |
|---|
| ISSN on article: | 0927-6505 |
|---|
| DOI: | 10.1016/j.astropartphys.2021.102564 |
|---|
| NUK URN: | URN:SI:UNG:REP:P8FF0HZC |
|---|
| Publication date in RUNG: | 05.02.2021 |
|---|
| Views: | 3416 |
|---|
| Downloads: | 0 |
|---|
| Metadata: |    |
|---|
|
:
|
Copy citation |
|---|
| | | | Average score: | (0 votes) |
|---|
| Your score: | Voting is allowed only for logged in users. |
|---|
| Share: |  |
|---|
Hover the mouse pointer over a document title to show the abstract or click
on the title to get all document metadata. |
