Papers by Daniele Fargion
arXiv (Cornell University), Jan 31, 2017
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arXiv (Cornell University), Feb 23, 1999
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arXiv (Cornell University), Aug 30, 2016
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HAL (Le Centre pour la Communication Scientifique Directe), Mar 6, 2019
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cosp, Jul 1, 2018
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TechConnect Briefs, May 22, 2016
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Gamma jets (G J) at MeV energies may be produced in galactic halos by Inverse Compton Scattering ... more Gamma jets (G J) at MeV energies may be produced in galactic halos by Inverse Compton Scattering (ICS) of coUinear ultrarelativistic electron beams (at GeV energies) onto thermal photons. These electron jets are emitted by neutron star jets (NSJ) or black holes (BH) while the target thermal photons are generated by a nearby binary stellar- like companion (or by a relic accreting disk). The GJ precesses in a conical shape as a lighthouse (with a characteristic Keplerian binary period) forced by the NSJ magnetic lines interaction with the stellar companion ones. The sudden blazing of the G J, once the observer is into the beam cone direction, is detected as a GRB. Our predicted GRB spectra fit the GRB observed ones; GRB luminosity, variabihty and counts are well explained if the GJ sources are located in an "extended" and an "evaporating" galactic halo as the one recently required in the fast running away NS model. Observed jets such as SS433, the Great Annihilator, superhminal sources such as the last GRS1758-258, GRS1915+105 are the ideal candidates for NSJ as well as GJ. The SGRs are the lower energy and wider beamed version of this GJ model so they are linked to classical GRBs. The last mysterious presence of the twin rings near SN1987A (as well as the ring traces near NGC6543) are the spectacular signature of such (double sided) conical jet precession projected onto the red giant relic spherical shell. The tiny but very puzzling offaxis nature of the SN1987A twin rings is due to the high eccentricity of the binary NSJ. The GRBs from the nearby Andromeda halo might be detected as soon as the instrumental sensitivity is increased.
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Lettere Al Nuovo Cimento, Apr 1, 1983
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cosp, Jul 1, 2016
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42nd COSPAR Scientific Assembly, Jul 1, 2018
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Proceedings of XII Multifrequency Behaviour of High Energy Cosmic Sources Workshop — PoS(MULTIF2017), 2018
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Proceedings of Frontier Research in Astrophysics — PoS(FRAPWS2014), 2016
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Proceedings of XII Multifrequency Behaviour of High Energy Cosmic Sources Workshop — PoS(MULTIF2017), 2018
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arXiv: High Energy Astrophysical Phenomena, 2016
Every GRB model where the progenitor is assumed to be a highly relativistic hadronic jet whose pi... more Every GRB model where the progenitor is assumed to be a highly relativistic hadronic jet whose pions, muons and electron pair secondaries are feeding the gamma jets engine, necessarily (except for very fine-tuned cases) leads to a high average neutrino over photon radiant exposure (radiance), a ratio well above unity, though the present observed average IceCube neutrino radiance is at most comparable to the gamma in the GRB one. Therefore no hadronic GRB, fireball or hadronic thin precessing jet, escaping exploding star in tunneled or penetrarting beam, can fit the actual observations. A new model is shown here, based on a purely electronic progenitor jet, fed by neutrons (and relics) stripped from a neutron star (NS) by tidal forces of a black hole or NS companion, showering into a gamma jet. Such thin precessing spinning jets explain unsolved puzzles such as the existence of the X-ray precursor in many GRBs. The present pure electron jet model, disentangling gamma and (absent) neu...
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IceCube Neutrino Astronomy is considered. The tau neutrino flavor paucity and the asymmetry for t... more IceCube Neutrino Astronomy is considered. The tau neutrino flavor paucity and the asymmetry for the tracks suggest a dominant atmospheric charm noise. The correlated cascades and tracks asymmetry with relevant statistics enforce the charm noise dominance in the data. The charm signal may explain at once the absence of correlation for the tracks data with the galactic plane and with known brightest gamma sources.
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arXiv: High Energy Astrophysical Phenomena, 2017
Since 2013 IceCube cascade showers sudden overabundance have shown a fast flavor change above 30-... more Since 2013 IceCube cascade showers sudden overabundance have shown a fast flavor change above 30-60 TeV up to PeV energy. This flavor change from dominant muon tracks at TeVs to shower events at higher energies, has been indebted to a new injection of a neutrino astronomy. However the recent published 54 neutrino HESE, high energy starting events, as well as the 38 external muon tracks made by trough going muon formed around the IceCube, none of them are pointing to any expected X-gamma or radio sources: no one in connection to GRB, no toward active BL Lac, neither to AGN source in Fermi catalog. No clear correlation with nearby mass distribution (Local Group), nor to galactic plane. Moreover there have not been any record (among a dozen of 200 TeV energetic events) of the expected double bang due to the tau neutrino birth and decay. An amazing and surprising unfair distribution in flavor versus expected democratic one. Finally there is not a complete consistence of the internal HES...
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arXiv: High Energy Astrophysical Phenomena, 2015
High Energy Neutrino Astronomy has been revealed by a sudden change in the flavor composition aro... more High Energy Neutrino Astronomy has been revealed by a sudden change in the flavor composition around maximal energies since three years of recording in ice km detector. However these discover didn' t led to any clear promised Neutrino Astronomy land yet. No correlation with hard gamma sources was found. Moreover the astrophysical spectra expected at Fermi value, seem to converge to a softer value, also required to avoid any Glashow resonant neutrino signal. We suggest a main solution within a composite flux ruled by prompt atmospheric neutrinos. Nevertheless the recent discover of twentyone crossing muons at hundreds TeVs had shown a first narrow overlapped doublet and a correlated track with a peculiar hard UHECR event clustering pointing to a well known microjet in bynary precession; these first connections hint for a non negligible astrophysical component making neutrino astronomy anyway already more than a hope.
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arXiv: High Energy Astrophysical Phenomena, 2016
We argue that any GRB model where the progenitor is made by high relativistic hadronic interactio... more We argue that any GRB model where the progenitor is made by high relativistic hadronic interactions shock waves, and later on by electron-pairs feeding gamma jets, is necessarily leading to an average high neutrino over photon fluency ratio well above unity, mostly above several thousands. The present observed average highest energy ICECUBE neutrino energy fluency is at most comparable to the gamma-X in GRB one. Therefore no hadronic GRB, Fireball or even any earliest hadronic thin precessing Jet, may fit the observation. We therefore imagine a novel electronic thin spinning and precessing jet, born in late binary system where a NS stripped by tidal forces feed an accreating ring around BH or NS companion, able to avoid the overcrowded neutrino tails foreseen in hadronic GRB models. In some occasion such an electronic model may lead to an explosion, due to stripped NS unstability, that shines during a GRB with an (apparent) late SN-like event.
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arXiv: High Energy Astrophysical Phenomena, 2017
The largest Solar flare have been recorded in gamma flash and hard spectra up to tens GeV energy.... more The largest Solar flare have been recorded in gamma flash and hard spectra up to tens GeV energy. The present building and upgrade of Hyper-Kamiokande (HK) and IceCube (as well as Deep Core, PINGU) neutrino detectors do offer a novel way to largest trace of solar Flare: their sudden anti-neutrino (or neutrino) flare made by proton scattering and pion decays via Delta resonance production. These signals might be observable at largest flare by HK via soft spectra up to tens- hundred MeV energy and by IceCube-PINGU at higher, GeV up to hundred GeV, energies. We show the expected rate of signals for the most powerful solar flare occurred in recent decades.
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Papers by Daniele Fargion