Searches for correlation between UHECR events and high-energy gamma-ray Fermi-LAT data

Álvarez, Ezequiel; Cuoco, A.; Mirabal, N.; Zaharijaš, Gabrijela

doi:10.1088/1475-7516/2016/12/023

Cited by 7 publications

(5 citation statements)

References 54 publications

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“…Among the proposed scenarios offered as an explanation for this additional spectral component, those involving UHECRs (e.g., Asano et al 2009a) are attractive for multimessenger connections. The possibility that UHECRs are accelerated in GRBs was also studied through the direct cross-correlations between the LAT HE (1 GeV) events and UHECRs detected by the Telescope Array and the Pierre Auger Observatory (Alvarez et al 2016). However, no statistically significant correlation was found in comparisons to date.…”

Section: Introductionmentioning

confidence: 99%

Multicollision Internal Shock Lepto-hadronic Models for Energetic Gamma-Ray Bursts (GRBs)

Rudolph

Πετροπούλου

Bošnjak

et al. 2023

ApJ

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For a subpopulation of energetic gamma-ray bursts (GRBs), a moderate baryonic loading may suffice to power ultra-high-energy cosmic rays (UHECRs). Motivated by this, we study the radiative signatures of cosmic-ray protons in the prompt phase of energetic GRBs. Our framework is the internal shock model with multicollision descriptions of the relativistic ejecta (with different emission regions along the jet), plus time-dependent calculations of photon and neutrino spectra. Our GRB prototypes are motivated by Fermi-Large Area Telescope-detected GRBs (including GRB 221009A) for which further, owing to the large energy flux, neutrino nonobservation of single events may pose a strong limit on the baryonic loading. We study the feedback of protons on electromagnetic spectra in synchrotron- and inverse Compton-dominated scenarios to identify the multiwavelength signatures, to constrain the maximally allowed baryonic loading, and to point out the differences between hadronic and inverse Compton signatures. We find that hadronic signatures appear as correlated flux increases in the optical-UV to soft X-ray and GeV–TeV gamma-ray ranges in the synchrotron scenarios, whereas they are difficult to identify in inverse Compton-dominated scenarios. We demonstrate that baryonic loadings around 10, which satisfy the UHECR energetic requirements, do not distort the predicted photon spectra in the Fermi Gamma-Ray Burst Monitor range and are consistent with constraints from neutrino data if the collision radii are large enough (i.e., the time variability is not too short). It therefore seems plausible that under the condition of large dissipation radii a population of energetic GRBs can be the origin of the UHECRs.

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Section: Introductionmentioning

confidence: 99%

Multicollision Internal Shock Lepto-hadronic Models for Energetic Gamma-Ray Bursts (GRBs)

Rudolph

Πετροπούλου

Bošnjak

et al. 2023

ApJ

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“…Such a XC technique was previously proposed to study the anisotropy of the γ-ray sky by Camera et al (2013), Fornengo & Regis (2014), and Pinetti et al (2019) and proved successful for several tracers of the LSS (Fornengo et al 2015;Cuoco et al 2015;Branchini et al 2017;Ammazzalorso et al 2020). A search for a XC between UHECRs and high-energy photons was performed in Alvarez et al (2016). If UHECR sources statistically trace the LSS, then the positions of these sources, and the arrival directions of UHECRs (if not strongly affected by intervening magnetic fields), should have a non-zero correlation with a galaxy sample up to a given distance.…”

Section: Introductionmentioning

confidence: 99%

Detecting ultra-high-energy cosmic ray anisotropies through harmonic cross-correlations

Urban

Camera

Alonso

2021

A&A

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We propose an observable for ultra-high-energy cosmic ray (UHECR) physics: the harmonic-space cross-correlation power spectrum between the arrival directions of UHECRs and the large-scale cosmic structure mapped by galaxies. This cross-correlation has not yet been considered in the literature, and it permits a direct theoretical modelling of the main astrophysical components. We describe the expected form of the cross-correlation and show how, if the distribution of UHECR sources traces the large-scale cosmic structure, it could be easier to detect with current data than the UHECR auto-correlation. Moreover, the cross-correlation is more sensitive to UHECR anisotropies on smaller angular scales, it is more robust to systematic uncertainties, and it could be used to determine the redshift distribution of UHECR sources, making it a valuable tool for determining their origins and properties.

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“…For example, due to its high sensitivity, the CTA project [10] will be capable of detecting the first gamma-ray signature of the most powerful accelerators of ultra-high-energy cosmic rays [11]. Several attempts have been made to search for correlations between high-energy neutrinos and charged cosmic rays, as well as between gamma rays and cosmic rays [12][13][14][15][16]. This kind of investigation is much easier to perform using a common set of astrophysical data and convenient tools to work with it.…”

Section: Introductionmentioning

confidence: 99%

Russian–German Astroparticle Data Life Cycle Initiative

Bychkov

Demichev

Dubenskaya

et al. 2018

Data

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Modern large-scale astroparticle setups measure high-energy particles, gamma rays, neutrinos, radio waves, and the recently discovered gravitational waves. Ongoing and future experiments are located worldwide. The data acquired have different formats, storage concepts, and publication policies. Such differences are a crucial point in the era of Big Data and of multi-messenger analysis in astroparticle physics. We propose an open science web platform called ASTROPARTICLE.ONLINE which enables us to publish, store, search, select, and analyze astroparticle data. In the first stage of the project, the following components of a full data life cycle concept are under development: describing, storing, and reusing astroparticle data; software to perform multi-messenger analysis using deep learning; and outreach for students, post-graduate students, and others who are interested in astroparticle physics. Here we describe the concepts of the web platform and the first obtained results, including the meta data structure for astroparticle data, data analysis by using convolution neural networks, description of the binary data, and the outreach platform for those interested in astroparticle physics. The KASCADE-Grande and TAIGA cosmic-ray experiments were chosen as pilot examples.

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Searches for correlation between UHECR events and high-energy gamma-ray Fermi-LAT data

Cited by 7 publications

References 54 publications

Multicollision Internal Shock Lepto-hadronic Models for Energetic Gamma-Ray Bursts (GRBs)

Multicollision Internal Shock Lepto-hadronic Models for Energetic Gamma-Ray Bursts (GRBs)

Detecting ultra-high-energy cosmic ray anisotropies through harmonic cross-correlations

Russian–German Astroparticle Data Life Cycle Initiative

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