The Physics of UHECRs: Spectra, Composition and the Transition Galactic-Extragalactic

Aloisio, Roberto

doi:10.7566/jpscp.19.011008

Cited by 2 publications

(4 citation statements)

References 55 publications

(70 reference statements)

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“…The differences between the second and third scenarios were in general larger, but still smaller than ∼ 6%, except for a single value that was at ∼ 21%. 1 These results suggest that using cubes of side 100 pc containing a uniform magnetic field does not have a significant effect on the propagation, while using larger cubes could have a more pronounced effect.…”

Section: Validationmentioning

confidence: 88%

“…Ultra high energy cosmic rays (UHECRs) are the most energetic particles ever detected, with energies in some cases exceeding 10 20 eV. Their sources, mechanism of acceleration, and composition are currently unknown and debated [1]. One reason for the difficulty to reach safe conclusions in any of the above areas is the extremely small flux of the incoming UHECRs, which leads to poor statistics.…”

Section: Jcap02(2019)004mentioning

confidence: 99%

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Deflections of ultra-high energy cosmic rays by the Milky Way magnetic field: how well can they be corrected?

Magkos

Pavlidou

2019

J. Cosmol. Astropart. Phys.

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Locating the sources of ultra-high energy cosmic rays (UHECRs) still remains a difficult puzzle for modern astrophysics. A major hurdle in the search for the sources is the fact that UHECRs are deflected by the Galactic magnetic field (GMF). Current knowledge of the GMF is limited, as most experimental measurements track line-of-sight-integrated quantities that are used to obtain best-fit parameters for global models including a large random component. The advent, however, of the Gaia era, with measurements of ∼ 10 9 stellar parallaxes, in combination with upcoming large polarimetric surveys, make, for the first time, a 3D measurement of the GMF possible in principle. Such measurements can then be used to attempt a reconstruction of the trajectories of individual UHECRs through the Galaxy, in order to correct for their deflection.Motivated by these developments, in the present work, we study the limits of such a correction, by examining how its effectiveness depends on the uncertainty of any such future magnetic field measurements. To that end, we simulate attempts to reconstruct the trajectory of the cosmic ray by using hypothetical measurements of the GMF, based on values received from two recently updated GMF models. To simulate the uncertainty of a 3D measurement, random errors to these values are introduced separately for the plane-of-the-sky (POS) magnitude, the line-of-sight (LOS) magnitude and the POS direction.Our results highlight the conditions under which an effective correction is achievable. We find that the effectiveness is dependent on the particle rigidity and arrival direction, and can vary significantly depending on the GMF model used.

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Section: Validationmentioning

confidence: 88%

Section: Jcap02(2019)004mentioning

confidence: 99%

Deflections of ultra-high energy cosmic rays by the Milky Way magnetic field: how well can they be corrected?

Magkos

Pavlidou

2019

J. Cosmol. Astropart. Phys.

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“…Despite decades of observations and modelling (see e.g. Kotera 2011;Abbasi et al 2012 andAloisio 2018 for recent reviews) the underlying source remains uncertain.…”

Section: Ultra-high Energy Cosmic Raysmentioning

confidence: 99%

“…UHECRs (Auger 1935;Linsley 1963) have puzzled physicists and astrophysicists since their discovery. Despite decades of observations and modeling (see e.g., Kotera 2011;Abbasi et al 2012 andAloisio 2018 for recent reviews) the underlying source remains uncertain.…”

Section: Ultra-high Energy Cosmic Raysmentioning

confidence: 99%

A quark nova in the wake of a core-collapse supernova: a unifying model for long duration gamma-ray bursts and fast radio bursts

Ouyed

Leahy

Koning

2020

Res. Astron. Astrophys.

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By appealing to a Quark-Nova (QN; the explosive transition of a neutron star to a quark star) in the wake of a core-collapse Supernova explosion of a massive star, we develop a unified model for long duration Gamma-ray Bursts (LGRBs) and Fast Radio Bursts (FRBs). The time delay (years to decades) between the SN and the QN and, the fragmented nature (i.e. millions of chunks) of the relativistic QN ejecta are key to yielding a robust LGRB engine. In our model, a LGRB light-curve exhibits the interaction of the fragmented QN ejecta with a turbulent (i.e. filamentary and magnetically saturated) SN ejecta which is shaped by its interaction with an underlying pulsar wind nebula (PWN). The afterglow is due to the interaction of the QN chunks, exiting the SN ejecta, with the surrounding medium. Our model can fit BAT/XRT prompt and afterglow light-curves, simultaneously with their spectra, thus yielding the observed properties of LGRBs (e.g. the Band function and the X-ray flares). We find that the peak luminosity-peak photon energy relationship (i.e. the Yonetoku law), and the isotropic energy-peak photon energy relationship (i.e. the Amati law) are not fundamental but phenomenological. FRBs in our model result from coherent synchrotron emission (CSE) when the QN chunks interact with non-turbulent weakly magnetized PWN-SN ejecta, where conditions are prone to the Weibel instability. Magnetic field amplification induced by the Weibel instability in the shocked chunk frame sets the bunching length for electrons and pairs to radiate coherently. The resulting emission frequency, luminosity, duration and dispersion measure (DM) in our model are consistent with FRB data. We find a natural unification of high-energy burst phenomena from FRBs to LGRBs including X-ray Flashes (XRFs) and X-ray rich GRBs (XRR-GRBs) as well as Super-Luminous SNe (SLSNe). We find a possible connection between Ultra-High Energy Cosmic Rays and FRBs and propose that a QN following a binary neutron star merger can yield a short GRB (SGRB) with fits to BAT/XRT light-curves.

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The Physics of UHECRs: Spectra, Composition and the Transition Galactic-Extragalactic

Cited by 2 publications

References 55 publications

Deflections of ultra-high energy cosmic rays by the Milky Way magnetic field: how well can they be corrected?

Deflections of ultra-high energy cosmic rays by the Milky Way magnetic field: how well can they be corrected?

A quark nova in the wake of a core-collapse supernova: a unifying model for long duration gamma-ray bursts and fast radio bursts

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