Origin of small-scale anisotropies in Galactic cosmic rays

Ahlers, M.; Mertsch, Philipp

doi:10.1016/j.ppnp.2017.01.004

Cited by 76 publications

(86 citation statements)

References 130 publications

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“…This is in addition to the deflection in extragalactic magnetic fields, which is considerably more difficult to quantify but unlike the GMF, only diminishes the directional information by blurring the UHECR sources over more or less large cones, an effect ger Highlights tical and systematic uncertainty of 2% and  9% respectively. For comparison, a recent attem estimate the light-mass fraction from X max was based on 118 events only [29]. The mass fr ns presented here complement the findings of the KASCADE-Grande Coll.…”

Section: Ultra-high Energy Cosmic Rayssupporting

confidence: 68%

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IMAGINE: a comprehensive view of the interstellar medium, Galactic magnetic fields and cosmic rays

Boulanger

Enßlin

Fletcher

et al. 2018

J. Cosmol. Astropart. Phys.

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In this white paper we introduce the IMAGINE Consortium and its scientific background, goals and structure. The purpose of the consortium is to coordinate and facilitate the efforts of a diverse group of researchers in the broad areas of the interstellar medium, Galactic magnetic fields and cosmic rays, and our overarching goal is to develop more comprehensive insights into the structures and roles of interstellar magnetic fields and their interactions with cosmic rays within the context of Galactic astrophysics. The ongoing rapid development of observational and numerical facilities and techniques has resulted in a widely felt need to advance this subject to a qualitatively higher level of self-consistency, depth and rigour. This can only be achieved by the coordinated efforts of experts in diverse areas of astrophysics involved in observational, theoretical and numerical work. We present our view of the present status of this research area, identify its key unsolved problems and suggest a strategy that will underpin our work. The backbone of the consortium is the Interstellar MAGnetic field INference Engine, a publicly available Bayesian platform that employs robust statistical methods to explore the multi-dimensional likelihood space using any number of modular inputs. This tool will be used by the IMAGINE Consortium to develop an interpretation and modelling framework that provides the method, power and flexibility to interfuse information from a variety of observational, theoretical and numerical lines of evidence into a self-consistent and comprehensive picture of the thermal and non-thermal interstellar media. An important innovation is that a consistent understanding of the phenomena that are directly or indirectly influenced by the Galactic magnetic field, such as the deflection of ultra-high energy cosmic rays or extragalactic backgrounds, is made an integral part of the modelling. The IMAGINE Consortium, which is informal by nature and open to new participants, hereby presents a methodological framework for the modelling and understanding of Galactic magnetic fields that is available to all communities whose research relies on a state of the art solution to this problem.

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Section: Ultra-high Energy Cosmic Rayssupporting

confidence: 68%

“…Combined cosmic ray anisotropy of the Tibet-AS and IceCube experiments in the equatorial coordinate system. See [29] for detailed information. 1 At GCR proton energies 100 GeV, the decreasing cosmic ray energy density implies a significantly smaller growth rate of the resonantly excited Alfvén waves.…”

Section: Galactic Cosmic Raysmentioning

confidence: 99%

IMAGINE: a comprehensive view of the interstellar medium, Galactic magnetic fields and cosmic rays

Boulanger

Enßlin

Fletcher

et al. 2018

J. Cosmol. Astropart. Phys.

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“…Besides the dipolar pattern expected from the diffusion in the presence of a CR density gradient, also structures at smaller angular scales, at least down to 10 • , have been observed in the TeV to PeV energy range [145,146,147,148]. These are not predicted by the simple diffusion picture and they have been the topic of different theoretical modeling efforts (see [149] for a review). The suggested explanations consider local effects of the heliosphere, possible non-diffusive propagation or that they may be the result of a combination of the dipolar pattern and the local inhomogeneities of the interstellar magnetic fields within the scale of the diffusion length [150,151].…”

Section: Anisotropies In the Tev To Pev Energy Rangementioning

confidence: 99%

Progress in high-energy cosmic ray physics

Mollerach

Roulet

2018

Progress in Particle and Nuclear Physics

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We review some of the recent progress in our knowledge about high-energy cosmic rays, with an emphasis on the interpretation of the different observational results. We discuss the effects that are relevant to shape the cosmic ray spectrum and the explanations proposed to account for its features and for the observed changes in composition. The physics of air-showers is summarized and we also present the results obtained on the proton-air cross section and on the muon content of the showers. We discuss the cosmic ray propagation through magnetic fields, the effects of diffusion and of magnetic lensing, the cosmic ray interactions with background radiation fields and the production of secondary neutrinos and photons. We also consider the cosmic ray anisotropies, both at large and small angular scales, presenting the results obtained from the TeV up to the highest energies and discuss the models proposed to explain their origin.Comment: 48 pages, to appear in Progress in Particle and Nuclear Physics (2017

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“…Note that we have not accounted for the shot noise necessarily present in the data or for cross talk between multipole moments due to IceCube's limited field of view, see Ref. [7]. In the right panel of Fig.…”

Section: Resultsmentioning

confidence: 99%