A Galactic Halo Origin of the Neutrinos Detected by IceCube

Taylor, A. M.

doi:10.1016/j.nuclphysbps.2015.06.069

Cited by 6 publications

(8 citation statements)

References 31 publications

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“…Among the possibilities explored are viable astrophysical sources [11][12][13][14][15][16][17][18][19][20][21], a possible DM connection [22][23][24][25][26][27], a leptoquark resonance [28], the decay of massive neutrinos [29,30], the decay of a very heavy long-lived particle [31,32] or even the possibility that these events could be understood in terms of novel interactions that neutrinos have with the cosmic neutrino background [33][34][35]. Finally, in ref.…”

Section: Jhep02(2015)189mentioning

confidence: 99%

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Possible interpretations of IceCube high-energy neutrino events

Fong

Minakata

Panes

et al. 2015

J. High Energ. Phys.

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Abstract:We discuss possible interpretations of the 37 high energy neutrino events observed by the IceCube experiment in the South Pole. We examine the possibility to explain the observed neutrino spectrum exclusively by the decays of a heavy long-lived particle of mass in the PeV range. We compare this with the standard scenario, namely, a single power-law spectrum related to neutrinos produced by astrophysical sources and a viable hybrid situation where the spectrum is a product of two components: a power-law and the long-lived particle decays. We present a simple extension of the Standard Model that could account for the heavy particle decays that are needed in order to explain the data. We show that the current data equally supports all above scenarios and try to evaluate the exposure needed in order to falsify them in the future.

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Section: Jhep02(2015)189mentioning

confidence: 99%

“…Since this is not directly relevant for our current study, we won't pursue it further. Next the leptonic decay widths of Y to charged and neutral leptons are, respectively, 20) JHEP02 (2015)189…”

Section: The Fermionic Sectormentioning

confidence: 99%

Possible interpretations of IceCube high-energy neutrino events

Fong

Minakata

Panes

et al. 2015

J. High Energ. Phys.

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“…However, the limited event statistics of the samples leave some room for Galactic contributions. Possible Galactic contributions to super-TeV neutrinos are the diffuse neutrino emission of galactic CRs [11,12,13], the joint emission of galactic PeV sources [14,15] or microquasars [16], and extended galactic structures like the Fermi Bubbles [17,11,18] or the Galactic halo [19]. A possible association with the sub-TeV diffuse galactic gamma-ray emission [20] and constraints from the non-observation of diffuse galactic PeV gamma-rays [21,11], have also been investigated.…”

Section: Pos(icrc2015)022mentioning

confidence: 99%

“…However, with the limited angular resolution and statistics of the neutrino observation it is possible that extended emission from Galactic sources can contribute to the data. These emission includes the diffuse gamma-ray emission of the Galactic Plane [72], quasi-diffuse emission from the sum of Galactic sources, or extended emission from Fermi Bubbles [73,74] or Galactic halo [19]. Exotic contributions like decaying heavy dark matter could also produce an extended emission in gammarays and neutrinos [22,23,24,25].…”

Section: Multi-messenger Aspects Of Cosmic Neutrinosmentioning

confidence: 99%

Multi-Messenger Aspects of Cosmic Neutrinos

Ahlers¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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The recent observation of TeV-PeV neutrinos by IceCube has opened a new window to the highenergy Universe. I will discuss this signal in the context of multi-messenger astronomy. For extragalactic source scenarios the corresponding hadronic gamma-rays are not directly observable due to interactions with the cosmic radiation backgrounds. Nevertheless, the isotropic sub-TeV gamma ray background observed by Fermi-LAT contains indirect information from secondary emission produced in electromagnetic cascades. On the other hand, observation of PeV gamma rays would provide a smoking-gun signal for Galactic emission. Interestingly, the overall energy density of the observed neutrino flux is close to a theoretical limit for neutrino production in ultrahigh energy cosmic ray sources and might indicate a common origin of these phenomena. I will highlight various multi-messenger relations and their implications for neutrino source scenarios.

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“…而预期的 µ 子背景为 8.4 ± 4.2 个, 预期的大气中微子背景为 6.6 +5.9 −1.6 个, 置信度达到了 5.7σ . 37 个事件的空间分布基本是各向同性的, 表明其来源很可能是河外, 因为河内源大多分布在银盘上, 难以造成各向同性分布 (但这些中微子也有可能产生于银河系的晕中 [67] , 另参考文献 [ 大体来说, 中微子的流量主要由宇宙线的总能量以及反应效率两者决定, 其关系可以写成…”

Section: 极高能宇宙线的反应及次级粒子unclassified

河外极高能宇宙线的起源

Liu

Wang

Zhang

2015

Sci. Sin.-Phys. Mech. Astron.

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The origin of ultrahigh energy cosmic rays is a long-standing puzzle. Studies on these energetic particles will not only reveal the most violent process in the universe, but also extend our understanding on particle physics at extremely high energies. Thanks to large cosmic ray experiments such as the Pierre Auger Observatory (PAO) and the Telescope Array (TA), a lot of progress has been made in the studies on cosmic rays with energy above 10 18 eV, including the discovery of flux suppression at the highest energy of the spectrum or the GZK cutoff, the possible anisotropy signal especially the correlation with extragalactic objects and their chemical compositions. In this paper, we firstly give a brief review on the detection technique of ultrahigh energy cosmic rays and recent results from PAO and TA. And then, various candidate sources of ultrahigh energy cosmic rays such as gamma-ray bursts, active galactic nuclei, intergalactic shocks are introduced, as well as some basic theories on particle acceleration mechanisms. Also, we discuss the interactions of ultrahigh energy cosmic rays with photon fields, matter and magnetic fields. Some constraints on candidate sources can be obtained through multi-messengers like high energy neutrinos and gamma rays generated in the propagation of the cosmic rays from distant universe. Additionally, the possible anisotropy signal of ultrahigh energy cosmic ray events can also be used to study the distance and metallicity of the candidate sources, and probe Galactic and extragalactic magnetic fields. particle astrophysics, ultrahigh energy cosmic rays, neutrino, gamma ray, magnetic field

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A Galactic Halo Origin of the Neutrinos Detected by IceCube

Cited by 6 publications

References 31 publications

Possible interpretations of IceCube high-energy neutrino events

Possible interpretations of IceCube high-energy neutrino events

Multi-Messenger Aspects of Cosmic Neutrinos

河外极高能宇宙线的起源

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