Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F20%3AA0000027" target="_blank" >RIV/47813059:19630/20:A0000027 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.3847/1538-4357/ab8ae9/meta" target="_blank" >https://iopscience.iop.org/article/10.3847/1538-4357/ab8ae9/meta</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/ab8ae9" target="_blank" >10.3847/1538-4357/ab8ae9</a>
Alternative languages
Result language
angličtina
Original language name
Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays
Original language description
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.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal
ISSN
0004-637X
e-ISSN
1538-4357
Volume of the periodical
895
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
11
Pages from-to
„14-1“-„14-11“
UT code for WoS article
000559792800001
EID of the result in the Scopus database
2-s2.0-85086326132