Impact of the magnetic horizon on the interpretation of the Pierre Auger Observatory spectrum and composition data

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Date
2024
Author
Abdul Halim A.
Abreu P.
Aglietta M.
Allekotte I.
Cheminant K.A.
Almela A.
Aloisio R.
Alvarez-Muñiz J.
Ammerman Yebra J.
Anastasi G.A.
Anchordoqui L.
Andrada B.
Andringa S.
Apollonio L.
Aramo C.
Araújo Ferreira P.R.
Arnone E.
Arteaga Velázquez J.C.
Assis P.
Avila G.
Avocone E.
Bakalova A.
Barbato F.
Bartz Mocellin A.
Bellido J.A.
Berat C.
Bertaina M.E.
Bhatta G.
Bianciotto M.
Biermann P.L.
Binet V.
Bismark K.
Bister T.
Biteau J.
Blazek J.
Bleve C.
Blümer J.
Boháčová M.
Boncioli D.
Bonifazi C.
BonneauArbeletche L.
Borodai N.
Brack J.
Brichetto Orchera P.G.
Briechle F.L.
Bueno A.
Buitink S.
Buscemi M.
Büsken M.
Bwembya A.
Caballero-Mora K.S.
Cabana-Freire S.
Caccianiga L.
Campuzano F.
Caruso R.
Castellina A.
Catalani F.
Cataldi G.
Cazon L.
Cerda M.
Cermenati A.
Chinellato J.A.
Chudoba J.
Chytka L.
Clay R.W.
Cobos Cerutti A.C.
Colalillo R.
Coluccia M.R.
Conceição R.
Condorelli A.
Consolati G.
Conte M.
Convenga F.
dos Santos D.C.
Costa P.J.
Covault C.E.
Cristinziani M.
Cruz Sanchez C.S.
Dasso S.
Daumiller K.
Dawson B.R.
de Almeida R.M.
de Jesús J.
de Jong S.J.
de Mello Neto J.R.T.
De Mitri I.
de Oliveira J.
de Oliveira Franco D.
de Palma F.
de Souza V.
de Souza de Errico B.P.
De Vito E.
Del Popolo A.
Deligny O.
Denner N.
Deval L.
di Matteo A.
Dobre M.
Dobrigkeit C.
D’Olivo J.C.
Domingues Mendes L.M.
Dorosti Q.
dos Anjos J.C.
dos Anjos R.C.
Ebr J.
Ellwanger F.
Emam M.
Engel R.
Epicoco I.
Erdmann M.
Etchegoyen A.
Evoli C.
Falcke H.
Farrar G.
Fauth A.C.
Feldbusch F.
Fenu F.
Fernandes A.
Fick B.
Figueira J.M.
Filipčič A.
Fitoussi T.
Flaggs B.
Fodran T.
Fujii T.
Fuster A.
Galea C.
García B.
Gaudu C.
Gherghel-Lascu A.
Giaccari U.
Glombitza J.
Gobbi F.
Gollan F.
Golup G.
Gómez Berisso M.
Gómez Vitale P.F.
Gongora J.P.
González J.M.
González N.
Góra D.
Gorgi A.
Gottowik M.
Guarino F.
Guedes G.P.
Guido E.
Gülzow L.
Hahn S.
Hamal P.
Hampel M.R.
Hansen P.
Harari D.
Harvey V.M.
Haungs A.
Hebbeker T.
Hojvat C.
Hörandel J.R.
Horvath P.
Hrabovský M.
Huege T.
Insolia A.
Isar P.G.
Janardhana V.
Janecek P.
Jilek V.
Johnsen J.A.
Jurysek J.
Kampert K.-H.
Keilhauer B.
Khakurdikar A.
Kizakke Covilakam V.V.
Klages H.O.
Kleifges M.
Knapp F.
Köhler J.
Krieger F.
Kunka N.
Lago B.L.
Langner N.
de Oliveira M.A.L.
Lema-Capeans Y.
Letessier-Selvon A.
Lhenry-Yvon I.
Lopes L.
Lu L.
Luce Q.
Lundquist J.P.
Machado Payeras A.
Majercakova M.
Mandat D.
Manning B.C.
Mantsch P.
Mariani F.M.
Mariazzi A.G.
Mariş I.C.
Marsella G.
Martello D.
Martinelli S.
Martínez Bravo O.
Martins M.A.
Mathes H.-J.
Matthews J.
Matthiae G.
Mayotte E.
Mayotte S.
Mazur P.O.
Medina-Tanco G.
Meinert J.
Melo D.
Menshikov A.
Merx C.
Michal S.
Micheletti M.I.
Miramonti L.
Mollerach S.
Montanet F.
Morejon L.
Mulrey K.
Mussa R.
Namasaka W.M.
Negi S.
Nellen L.
Nguyen K.
Nicora G.
Niechciol M.
Nitz D.
Nosek D.
Novotny V.
Nožka L.
Nucita A.
Núñez L.A.
Oliveira C.
Palatka M.
Pallotta J.
Panja S.
Parente G.
Paulsen T.
Pawlowsky J.
Pech M.
Pękala J.
Pelayo R.
Pelgrims V.
Pereira L.A.S.
Pereira Martins E.E.
Perez Armand J.
Pérez Bertolli C.
Perrone L.
Petrera S.
Petrucci C.
Pierog T.
Pimenta M.
Platino M.
Pont B.
Pothast M.
Shahvar M.P.
Privitera P.
Prouza M.
Querchfeld S.
Rautenberg J.
Ravignani D.
Reginatto Akim J.V.
Reininghaus M.
Reuzki A.
Ridky J.
Riehn F.
Risse M.
Rizi V.
de Carvalho W.R.
Rodriguez E.
Rojo J.R.
Roncoroni M.J.
Rossoni S.
Roth M.
Roulet E.
Rovero A.C.
Ruehl P.
Saftoiu A.
Saharan M.
Salamida F.
Salazar H.
Salina G.
Sanabria Gomez J.D.
Sánchez F.
Santos E.M.
Santos E.
Sarazin F.
Sarmento R.
Sato R.
Savina P.
Schäfer C.M.
Scherini V.
Schieler H.
Schimassek M.
Schimp M.
Schmidt D.
Scholten O.
Schoorlemmer H.
Schovánek P.
Schröder F.G.
Schulte J.
Schulz T.
Sciutto S.J.
Scornavacche M.
Sedoski A.
Segreto A.
Sehgal S.
Shivashankara S.U.
Sigl G.
Silli G.
Sima O.
Simkova K.
Simon F.
Smau R.
Šmída R.
Sommers P.
Soriano J.F.
Squartini R.
Stadelmaier M.
Stanič S.
Stasielak J.
Stassi P.
Strähnz S.
Straub M.
Suomijärvi T.
Supanitsky A.D.
Svozilikova Z.
Szadkowski Z.
Tairli F.
Tapia A.
Taricco C.
Timmermans C.
Tkachenko O.
Tobiska P.
Todero Peixoto C.J.
Tomé B.
Torrès Z.
Travaini A.
Travnicek P.
Tueros M.
Unger M.
Uzeiroska R.
Vaclavek L.
Vacula M.
Valdés Galicia J.F.
Valore L.
Varela E.
Vašíčková V.
Vásquez-Ramírez A.
Veberič D.
Vergara Quispe I.D.
Verzi V.
Vicha J.
Vink J.
Vorobiov S.
Watanabe C.
Weindl A.
Wiencke L.
Wilczyński H.
Wittkowski D.
Wundheiler B.
Yue B.
Yushkov A.
Zapparrata O.
Zas E.
Zavrtanik D.
Zavrtanik M.
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Abstract
The flux of ultra-high energy cosmic rays reaching Earth above the ankle energy (5 EeV) can be described as a mixture of nuclei injected by extragalactic sources with very hard spectra and a low rigidity cutoff. Extragalactic magnetic fields existing between the Earth and the closest sources can affect the observed CR spectrum by reducing the flux of low-rigidity particles reaching Earth. We perform a combined fit of the spectrum and distributions of depth of shower maximum measured with the Pierre Auger Observatory including the effect of this magnetic horizon in the propagation of UHECRs in the intergalactic space. We find that, within a specific range of the various experimental and phenomenological systematics, the magnetic horizon effect can be relevant for turbulent magnetic field strengths in the local neighbourhood in which the closest sources lie of order Brms ≃ (50–100) nG (20 Mpc/ds)(100 kpc/Lcoh)1/2, with ds the typical intersource separation and Lcoh the magnetic field coherence length. When this is the case, the inferred slope of the source spectrum becomes softer and can be closer to the expectations of diffusive shock acceleration, i.e., ∝ E−2. An additional cosmic-ray population with higher source density and softer spectra, presumably also extragalactic and dominating the cosmic-ray flux at EeV energies, is also required to reproduce the overall spectrum and composition results for all energies down to 0.6 EeV. © 2024 The Author(s).
URI
http://hdl.handle.net/11407/8746
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