The Issue with Diffusive Shock Acceleration

Caprioli, Damiano; Haggerty, Colby

doi:10.22323/1.358.0209

Cited by 6 publications

(6 citation statements)

References 32 publications

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“…Yet, the degree of hardening or even its very existence were largely questioned over the past decade. This stems mostly from the non-detection of a corresponding signature in radio or gamma-ray observations of young SNRs, with inferred indices for the emitting particle populations of ∼ 2.2 − 3.0 (Caprioli & Haggerty 2019). Additional evidence challenging concave distributions from non-linear DSA came from analyses of locally measured CR spectra in the framework of standard Galactic propagation models (see, e.g., Trotta et al 2011;Evoli et al 2019); despite coming with different assumptions on source and transport terms, they invariably require power-law indices in the range ∼2.3-2.4 for the nuclei injection spectra above ∼10 GeV (although it remains unclear in this context how exactly such injection spectra are shaped by the processes of acceleration in the source and escape from it).…”

Section: Sn 1987amentioning

confidence: 99%

Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre

Acharyya

Adam

Adams

et al. 2021

J. Cosmol. Astropart. Phys.

117

149

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A deep survey of the Large Magellanic Cloud at ∼ 0.1−100 TeV photon energies with the Cherenkov Telescope Array is planned. We assess the detection prospects based on a model for the emission of the galaxy, comprising the four known TeV emitters, mock populations of sources, and interstellar emission on galactic scales. We also assess the detectability of 30 Doradus and SN 1987A, and the constraints that can be derived on the nature of dark matter. The survey will allow for fine spectral studies of N 157B, N 132D, LMC P3, and 30 Doradus C, and half a dozen other sources should be revealed, mainly pulsar-powered objects. The remnant from SN 1987A could be detected if it produces cosmic-ray nuclei with a flat power-law spectrum at high energies, or with a steeper index 2.3 − 2.4 pending a flux increase by a factor > 3 − 4 over ∼ 2015 − 2035. Large-scale interstellar emission remains mostly out of reach of the survey if its > 10 GeV spectrum has a soft photon index ∼ 2.7, but degree-scale 0.1 − 10 TeV pion-decay emission could be detected if the cosmic-ray spectrum hardens above >100 GeV. The 30 Doradus star-forming region is detectable if acceleration efficiency is on the order of 1 − 10% of the mechanical luminosity and diffusion is suppressed by two orders of magnitude within < 100 pc. Finally, the survey could probe the canonical velocity-averaged cross section for self-annihilation of weakly interacting massive particles for cuspy Navarro-Frenk-White profiles.

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Section: Sn 1987amentioning

confidence: 99%

Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre

Acharyya

Adam

Adams

et al. 2021

J. Cosmol. Astropart. Phys.

117

149

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“…Recent observations have indicated that CCSNe commonly have CCSM with a size of R w ∼ a few × 10 14 -10 15 cm (Boian & Groh 2020;Chugai & Utrobin 2022;Terreran et al 2022). DSA should operate as in SN remnants, which predicts CR energy fractions of ∼10%-20% and spectral indices of s cr ∼ 2, being supported by numerical simulations (Axford et al 1977;Krymskii 1977;Bell 1978;Blandford & Ostriker 1978;Schure et al 2012;Caprioli & Spitkovsky 2014;Caprioli & Haggerty 2020). This situation is different from high-energy neutrino emission from jets, in which CR acceleration is highly uncertain (Mészáros & Waxman 2001;Murase et al 2006;Murase & Ioka 2013).…”

Section: High-energy Neutrinos From Ccsnementioning

confidence: 84%

Detecting High-energy Neutrino Minibursts from Local Supernovae with Multiple Neutrino Observatories

Kheirandish,

Murase

2023

ApJL

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Growing evidence from multiwavelength observations of extragalactic supernovae (SNe) has established the presence of dense circumstellar material in Type II SNe. Interaction between the SN ejecta and the circumstellar material should lead to diffusive shock acceleration of cosmic rays and associated high-energy emission. Observation of high-energy neutrinos along with the MeV neutrinos from SNe will provide unprecedented opportunities to understand unanswered questions in cosmic-ray and neutrino physics. We show that current and future neutrino detectors can identify high-energy neutrinos from an extragalactic SN in the neighborhood of the Milky Way. We present the prospects for detecting high-energy neutrino minibursts from SNe in known local galaxies, and demonstrate how the network of multiple high-energy neutrino detectors will extend the horizon for the identification of high-energy SN neutrinos. We also discuss high-energy neutrino emission from SN 2023ixf.

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“…However, such flat spectra are never observed in SNRs [16,17] or in radio SNe [18], and would be inconsistent with the observed fluxes of Galactic CRs when propagation in the Milky Way is accounted for [19,20]. The reader is referred to [21][22][23] and references therein for more details about the tension between DSA theory and observations, and for the possible solutions that have been suggested in the literature.…”

Section: Introductionmentioning

confidence: 94%

The Theory of Efficient Particle Acceleration at Shocks

Caprioli¹,

Haggerty²,

Blasi³

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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The recent discoveries in the theory of diffusive shock acceleration (DSA) that stem from firstprinciple kinetic plasma simulations are discussed. When ion acceleration is efficient, the backreaction of non-thermal particles and self-generated magnetic fields becomes prominent and leads to both enhanced shock compression and particle spectra significantly softer than the standard testparticle DSA theory. These results are discussed in the context of the non-thermal phenomenology of astrophysical shocks, with a special focus on the supernova remnant SN1006.

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The Issue with Diffusive Shock Acceleration

Cited by 6 publications

References 32 publications

Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre

Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre

Detecting High-energy Neutrino Minibursts from Local Supernovae with Multiple Neutrino Observatories

The Theory of Efficient Particle Acceleration at Shocks

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