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Naslov:FR-0 jetted active galaxies : extending the zoo of candidate sites for UHECR acceleration
Avtorji:ID Merten, Lukas (Avtor)
ID Boughelilba, Margot (Avtor)
ID Reimer, Anita (Avtor)
ID Da Vela, Paolo (Avtor)
ID Vorobiov, Serguei (Avtor)
ID Tavecchio, Fabrizio (Avtor)
ID Bonnoli, Giacomo (Avtor)
ID Lundquist, Jon Paul (Avtor)
ID Righi, Chiara (Avtor)
Datoteke:.pdf ICRC2021_986.pdf (1,13 MB)
MD5: F8BC7CC81C80544FA7B1328F80D94C26
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.08 - Objavljeni znanstveni prispevek na konferenci
Organizacija:UNG - Univerza v Novi Gorici
Opis:Fanaroff-Riley (FR) 0 radio galaxies form a low-luminosity extension to the well-established ultra-high-energy cosmic-ray (UHECR) candidate accelerators FR-1 and FR-2 galaxies. Their much higher number density — up to a factor five times more numerous than FR-1 with z ≤ 0.05 — makes them good candidate sources for an isotropic contribution to the observed UHECR flux. Here, the acceleration and survival of UHECR in prevailing conditions of the FR-0 environment are discussed. First, an average spectral energy distribution (SED) is compiled based on the FR0CAT. These photon fields, composed of a jet and a host galaxy component, form a minimal target photon field for the UHECR, which will suffer from electromagnetic pair production, photo-disintegration, photo-meson production losses, and synchrotron radiation. The two most promising acceleration scenarios based on Fermi-I order and gradual shear acceleration are discussed as well as different escape scenarios. When an efficient acceleration mechanism precedes gradual shear acceleration, e.g., Fermi-I orothers, FR-0 galaxies are likely UHECR accelerators. Gradual shear acceleration requires a jet Lorentz factor of Gamma>1.6, to be faster than the corresponding escape. In less optimistic models, a contribution to the cosmic-ray flux between the knee and ankle is expected to be relatively independent of the realized turbulence and acceleration.
Ključne besede:jetted active galaxies, FR-0 radiogalaxies, ultra-high energy cosmic rays, cosmic ray acceleration, cosmic ray energy losses
Leto izida:2021
Št. strani:str. 1-8
PID:20.500.12556/RUNG-6673 Novo okno
COBISS.SI-ID:73062147 Novo okno
UDK:539.1
ISSN pri članku:1824-8039
NUK URN:URN:SI:UNG:REP:QHH51HOF
Datum objave v RUNG:16.08.2021
Število ogledov:1766
Število prenosov:3
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
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Gradivo je del zbornika

Naslov:37th International Cosmic Ray Conference [also] ICRC2021
COBISS.SI-ID:69435907 Novo okno

Gradivo je del revije

Naslov:Proceedings of science
Skrajšan naslov:Pos proc. sci.
Založnik:Sissa
ISSN:1824-8039
COBISS.SI-ID:20239655 Novo okno

Gradivo je financirano iz projekta

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:N1-0111
Naslov:Identifikacija izvorov kozmičnih žarkov med aktivnimi galaksijami s curki

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
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