TeV sky versus AUGER one: Are UHECR also radioactive, heavy galactic nuclei?

Fargion, Daniele

doi:10.1016/j.nima.2012.01.069

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…The UHECR fragmentation in multiplets ,forseen for lightest nuclei before the observations, toward two main AGN sources is an obvious confirm of this scenario. The presence at edge energies of heavy (like Ni, Co, Fe) nuclei, might explain , by their largest bending, (originated mostly within our galaxy), bending able to smear and uncorrelate UHECR -to their sources events, possibly in correlation with tens TeV anisotropy sky [7] [5].…”

Section: The Uhecr Composition Along Eev-zev Energies : From Light Nu...mentioning

confidence: 86%

UHECR multiplets versus Hot spots clustering in AUGER sky: the forgotten signals

Fargion,

De Sanctis Lucentini,

Khlopov

2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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Two main UHECR hotspots have been found in the Auger sky, clustering towards NGC253 and CenA, our nearby AGN sources: their presence is still controversial, as well as the additional AUGER dipole at ten Eev. A first data (2009)(2010)(2011)(2012) sample in Auger was related to three chains of multiplets with energy of tens of EeV, clustered around the more energetic UHECR clusters. These multiplet trails, nearly a dozen of events each, were pointing to the main well-defined directions in the sky: Cen A and NGC 253. These secondaries signals, probably fragments of high-energy UHECR primaries, have been forgotten or neglected. Such additional information, in our opinion, is capable of accurately disentangle and confirm the nature of the UHECR candidate hot spot sources. For different reasons UHECR are imagined mostly located in our nearby (one or few Mpcs) Local Group universe.

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Section: The Uhecr Composition Along Eev-zev Energies : From Light Nu...mentioning

confidence: 86%

UHECR multiplets versus Hot spots clustering in AUGER sky: the forgotten signals

Fargion,

De Sanctis Lucentini,

Khlopov

2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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“…The present spread shower signals in ICECUBE maps are not useful to address clearly to any smoking gun sources, nor to test large scale anisotropy. Clustering along a source, possibly along galactic regions (in analogy to the observed Cen-A UHECR multiplet events in AUGER maps or to the ARGO-MILAGRO anisotropy sky at TeVs CR), might favor also the presence of UHECR radioactive decay in flight, bent by magnetic fields [13], whose decay secondaries could be γ and also TeVs-PeV neutrinos. However the need for sharp neutrino maps is compelling.…”

Section: Conclusion and Updatesmentioning

confidence: 95%

Crossing muons in Icecube at highest energy: a cornerstone to ν Astronomy

Fargion

Oliva

Lucentini

2014

Nuclear Physics B - Proceedings Supplements

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Highest energy neutrino events (contained) in cubic km ICECUBE detector resulted in last three years to be as many as 37 − 2 = 35 signals (two of those having been recently discharged); these tens-hundred TeV (32 energetic events) up to rarest (only 3) PeV cascade showers, proved to have an extraterrestrial origin. Their flux exceeded, indeed, the expected atmospheric noise and clearly favored and tested the birth of a long waited ν astronomy. The UHE neutrino flavor transition from a ν µ atmospheric dominance (over ν e showers at TeV energy), toward a higher energy shower cascade (ν e , ν τ ) events at few tens TeV up to PeV energy is a hint of such a fast extraterrestrial injection. The majority (28 out of 35) of all these events are spherical cascade showers and their exact timing in shower shining provided an approximate ν arrival direction, within about ±10 • . However, their consequent smeared map is inconclusive: both because of such a wide angle spread signal of ±10 • and because of their paucity, is not yet allowable to define any meaningful source correlation or anisotropy. The additional rarest 9 − 2 = 7 muon tracks, while being sharp in arrival directions, did not offer any correlated clustering nor any overlapping within known sources. Larger sample of UHE ν signals and their most accurate directionality is needed. We recently suggested that the highest energy (tens-TeV) crossing muon along the ICECUBE, mostly at horizons or upcoming, are the ideal tool able to reveal soon such clustering or even any narrow angle pointing to known (IR, X, Radio or γ) sources or self-correlation in rare doublet or triplet: a last hope for a meaningful and short-time ν Astronomy. Any crossing muons clustering along galactic sources or within UHECR arrivals might also probe rarest (possibly galactic, radioactive and in decay in flight) UHECR event made by nuclei or neutrons. Within three years of ICECUBE data all the non-contained crossing highest energy muons above few tens TeV may be several dozens, possibly around 54, mostly enhanced along horizontal edges, painting known sources and/or self-correlating in doublets or rarest triplet, offering a first solution of the UHE neutrino source puzzle (if steady or transient nearby source are at sight). Recent preliminary ICECUBE presentation on crossing muons are consistent with our preliminary muon rate estimate.

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UHECR Signatures and Sources

2023

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We discuss recent results on the clustering, composition and distribution of Ultra-High Energy Cosmic Rays (UHECR) in the sky; from the energy of several tens of EeV in the dipole anisotropy, up to the highest energy of a few narrow clusters, those of Hot Spots. Following the early UHECR composition records deviations from proton we noted that the UHECR events above 40 EeV can be made not just by any light or heavy nuclei, but mainly by the lightest ones as He,D, Li,Be. The remarkable Virgo absence and the few localized nearby extragalactic sources, such as CenA, NGC 253 and M82, are naturally understood: lightest UHECR nuclei cannot reach us from the Virgo distance of twenty Mpc, due to their nuclei fragility above a few Mpc distances. Their deflection and smearing in wide hot spots is better tuned to the lighter nuclei than to the preferred proton or heavy nuclei candidate courier. We note that these lightest nuclei still suffer of a partial photodistruction even from such close sources. Therefore, their distruption in fragments, within few tens EeV multiplet chain of events, have been expected and later on observed by Auger collaboration, nearly a decade ago. These multiplet presences, strongly correlate with the same CenA, NGC253 sources. The statistical weight of such correlation is reminded. We conclude that the same role of NGC 253 clustering at lower energies could also feed the Auger dipole anisotropy at lower energy ranges. Such lower energy anisotropy could be fed and integrated by nearest Vela, Crab, LMC and Cas A contributes. In our present UHECR model, based on lightest nuclei in local volumes of a few Mpcs, closest AGN, Star-Burst or very close SNR are superimposing their signals, frozen in different epochs, distances and directions, feeding small and wide anisotropy. Possible tests to confirm, or untangle the current model from alternative ones, are suggested and updated.

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TeV sky versus AUGER one: Are UHECR also radioactive, heavy galactic nuclei?

Cited by 5 publications

References 32 publications

UHECR multiplets versus Hot spots clustering in AUGER sky: the forgotten signals

UHECR multiplets versus Hot spots clustering in AUGER sky: the forgotten signals

Crossing muons in Icecube at highest energy: a cornerstone to ν Astronomy

UHECR Signatures and Sources

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