Journal Article

PUBDB-2025-01902

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Neutrino and pair creation in reconnection-powered coronae of accreting black holes

Karavola, D. (Corresponding author)Extern* ; Petropoulou, M. ; Fiorillo, D. F. G.Extern*DESY* ; Comisso, L. ; Sironi, L.

2024
IOP London

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Please use a persistent id in citations: doi:10.1088/1475-7516/2025/04/075  doi:10.3204/PUBDB-2025-01902

Report No.: arXiv:2410.12638

Abstract: A ubiquitous feature of accreting black hole systems is their hard X-ray emission which is thought to be produced through Comptonization of soft photons by electrons and positrons in the vicinity of the black hole, in a region with optical depth of order unity. The origin and composition of this Comptonizing region, known as the corona, is a matter open for debate. In this paper we investigate the role of relativistic protons accelerated in black-hole magnetospheric current sheets for the pair enrichment and neutrino emission of AGN coronae. Our model has two free parameters, namely the proton plasma magnetization $\sigma_{\rm p}$, which controls the peak energy of the neutrino spectrum, and the Eddington ratio $\lambda_{\rm Edd}$ (defined as the ratio between X-ray luminosity $L_{\rm X}$ and Eddington luminosity $L_{\rm Edd}$), which controls the amount of energy transferred to secondary particles. For sources with $\lambda_{\rm Edd} \gtrsim \lambda_{\rm Edd, crit}$ (where $\lambda_{\rm Edd, crit} \sim 10^{-1}$ for $\sigma_{\rm p}=10^5$ or $\sim 10^{-2}$ for $\sigma_{\rm p}=10^7$), proton-photon interactions and $ \gamma \gamma$ annihilation produce enough secondary pairs to achieve Thomson optical depths $\tau_{\rm T} \sim 0.1-10$. Additionally, we find that the neutrino luminosity scales as $L^2_{\rm X}/L_{\rm Edd}$ for $\lambda_{\rm Edd} \lesssim \lambda_{\rm Edd, crit}$, while it is proportional to $L_{\rm X}$ for higher $\lambda_{\rm Edd}$ values. We apply our model to four Seyfert galaxies, including NGC 1068, and discuss our results in light of recent IceCube observations.

Note: DFGF is supported by the Alexander von Humboldt Foundation (Germany)

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Contributing Institute(s):

1. Theoretische Astroteilchenphysik (Z_THAT)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)
2. INTERACTIONS - NBIA INTERACTIONS POSTDOCTORAL PROGRAMME (847523) (847523)

Experiment(s):

1. No specific instrument

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article (Erratum/Correction) Karavola, D. (Corresponding author)Extern* ; Petropoulou, M. ; Fiorillo, D. F. G.Extern* ; Comisso, L. ; Sironi, L.
Erratum: Neutrino and pair creation in reconnection-powered coronae of accreting black holes
Journal of cosmology and astroparticle physics 2025(11), E01 (2025) [10.1088/1475-7516/2025/11/E01]2025     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Karavola, D. (Corresponding author)Extern* ; Petropoulou, M. ; Fiorillo, D. F. G.Extern*DESY* ; Comisso, L. ; Sironi, L.
Neutrino and pair creation in reconnection-powered coronae of accreting black holes
    Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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