Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays

@article{49400,
   author = {Tursunov, Arman and Stuchlík, Zdeněk and Kološ, Martin and Dadhich, Naresh and Ahmedov, Bobomurat},
   article_number = {1},
   doi = {http://dx.doi.org/10.3847/1538-4357/ab8ae9},
   keywords = {PENROSE PROCESS; FORCE-FREE; EXTRACTION; ENERGETICS; EFFICIENCY},
   language = {eng},
   issn = {0004-637X},
   journal = {Astrophysical Journal},
   title = {Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays},
   url = {https://iopscience.iop.org/article/10.3847/1538-4357/ab8ae9/meta},
   volume = {895},
   year = {2020}
}

TY  - JOUR
ID  - 49400
AU  - Tursunov, Arman - Stuchlík, Zdeněk - Kološ, Martin - Dadhich, Naresh - Ahmedov, Bobomurat
PY  - 2020
TI  - Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays
JF  - Astrophysical Journal
VL  - 895
IS  - 1
SP  - "14-1"-"14-11"
EP  - "14-1"-"14-11"
SN  - 0004637X
KW  - PENROSE PROCESS
KW  - FORCE-FREE
KW  - EXTRACTION
KW  - ENERGETICS
KW  - EFFICIENCY
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/ab8ae9/meta
N2  - The production and acceleration mechanisms of ultrahigh-energy cosmic rays (UHECRs) of energy >10(20) eV, clearly beyond the GZK cutoff limit, remain unclear, which points to the exotic nature of the phenomena. Recent observations of extragalactic neutrinos may indicate that the source of UHECRs is an extragalactic supermassive black hole (SMBH). We demonstrate that ultraefficient energy extraction from a rotating SMBH driven by the magnetic Penrose process (MPP) could indeed fit the bill. We envision ionization of neutral particles, such as neutron beta decay, skirting close to the black hole horizon that energizes protons to over 10(20) eV for an SMBH of mass 10(9)M(circle dot) and magnetic field 10(4). G. Applied to the Galactic center SMBH, we have a proton energy of order approximate to 10(15.6) eV that coincides with the knee of the cosmic-ray spectra. We show that large gamma(z) factors of high-energy particles along the escaping directions occur only in the presence of an induced charge of the black hole, which is known as the Wald charge in the case of a uniform magnetic field. It is remarkable that the process requires neither an extended acceleration zone nor fine-tuning of accreting-matter parameters. Further, this leads to certain verifiable constraints on the SMBH's mass and magnetic field strength as the source of UHECRs. This clearly makes the ultraefficient regime of the MPP one of the most promising mechanisms for fueling the UHECR powerhouse.
ER  - 

TURSUNOV, Arman, Zdeněk STUCHLÍK, Martin KOLOŠ, Naresh DADHICH a Bobomurat AHMEDOV. Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays. \textit{Astrophysical Journal}. 2020, roč.~895, č.~1, s.~''14-1''-''14-11'', 11 s. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/ab8ae9.