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arXiv 1209.6090astro-ph.HEhep-ph
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UHECR的放射性和碎裂:γ各向异性和中微子PeV事件的相关

Radioactivity and fragmentation of UHECR: Correlating gamma anisotropy and neutrino PeV events

Daniele Fargion

摘要:

UHECR(超高能宇宙射线)被认为是质子,直线飞行,并受到GZK(CMB辐射不透明度)的限制。奥格在2007年提出,这种早期的UHECR各向异性与预见的超银河系平面是相容的,而HIRES和奥格都证实了光谱中明显的GZK截止。然而,自2007年以来,相同的AUGER成分有利于原子核(而不是核子)。最近在UHECR图中没有窄角聚集,因为它应该是预期的质子,沿着最近的室女座星系团的事件失踪,UHECR沿着Cen A的广泛传播(近16度角)与第一个质子-UHECR俄歇的理解不一致。自2008年以来,我们一直在为Cen A密集区提供轻核角色。然而,ICECUBE的TeV中微子集群或各向异性的情况下,它的光谱陡化主要有利于一个执政的大气中微子噪声高达几十TeV。然而,最近的两个PeV中微子事件,不能容易地共存或外推与这样的大气统治的情况下,或与GZK(无论是核子或核)的次级预期的光谱。最后,ARGO-MILAGRO-ICECUBE映象中的几十个TeV γ各向异性很难与已知的强子源联系起来。我们想象这样的各向异性由扩散的伽马射线控制,沿着UHECR弯曲和飞行发光:放射性GRB-SGRs-jet中的(Ni,Co,Al,D,中子)轻、重UHECR核在飞行中散射或衰变时,可能会在天空中绘画(由伽马,电子和中微子第二)他们的轨迹和弯曲,连接UHECR传播事件与TeV各向异性,也提供了一个非常现实的来源,观测到的PeV中微子。Díaz Trigo合作组最近在4U 1630 -47系统中观测到了这种相对论性Ni喷注的证据。

英文摘要:

UHECR (Ultra High Energy Cosmic Rays) were expected to be protons, to fly straight and to suffer from a GZK (opacity on CMB radiation) cut off. AUGER suggested in 2007 that such early UHECR anisotropy was compatible with the foreseen Super-Galactic plane, while both HIRES and AUGER confirmed this apparent GZK cut-off in the spectra. However, the same AUGER composition since 2007 had favored nuclei (and not nucleons). The recent absence of narrow angle clustering in UHECR maps, as it should be expected for protons, the missing of events along the nearest Cluster Virgo, the wide spread (nearly 16 degree angle) of UHECR along Cen A are in disagreement with the first proton-UHECR AUGER understanding. Since 2008 we had claimed a light nuclei role for the Cen A crowded area. However the ICECUBE absence of TeV neutrino clustering or anisotropy, its spectra steepening favors mostly a ruling atmospheric neutrino noise up to tens TeV. However two recent PeV neutrino event, cannot easily coexist or been extrapolated with such an atmospheric ruling scenario, or with GZK (either nucleons or nuclei) secondary expected spectra. Finally tens of TeV gamma anisotropy in ARGO-MILAGRO-ICECUBE maps may hardly be associated with known hadronic sources. We imagine such anisotropy ruled by diffused gamma secondaries, shining along UHECR bending and flight: radioactive (Ni,Co,Al,D, neutron) light and heavy UHECR nuclei in GRB-SGRs-jet, while scattering or decaying in flight, may paint in the sky (by gamma, electrons and neutrinos secondaries) their trajectories and bending, connecting UHECR spread events with TeV anisotropy, and also offering a very realistic source of first, otherwise puzzling, observed PeV neutrinos. Evidences for such relativistic Ni jet in 4U1630-47 system has been observed recently by Díaz Trigo collaboration.

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