ZEU-EXP/AT

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2019-07-15
16:54
OpenAccess [PUBDB-2019-02726] Journal Article
et al
A Decade of Gamma-Ray Bursts Observed by Fermi -LAT: The Second GRB Catalog
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission from gamma-ray bursts (GRBs). Here we present the second catalog of LAT-detected GRBs, covering the first 10 yr of operations, from 2008 to 2018 August 4. [...]
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ddc:520
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2019-07-15
16:44
OpenAccess [PUBDB-2019-02725] Journal Article
et al
Open Questions in Cosmic-Ray Research at Ultrahigh Energies
We review open questions and prospects for progress in ultrahigh-energy cosmic ray (UHECR) research, based on a series of discussions that took place during the “The High-Energy Universe: Gamma-Ray, Neutrino, and Cosmic-ray Astronomy” MIAPP workshop in 2018. Specifically, we overview open questions on the origin of the bulk of UHECRs, the UHECR mass composition, the origin of the end of the cosmic-ray spectrum, the transition from Galactic to extragalactic cosmic rays, the effect of magnetic fields on the trajectories of UHECRs, anisotropy expectations for specific astrophysical scenarios, hadronic interactions, and prospects for discovering neutral particles as well as new physics at ultrahigh energies [...]
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ddc:620
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2019-07-15
16:34
OpenAccess [PUBDB-2019-02724] Preprint/Report
et al
Fundamental Physics with High-Energy Cosmic Neutrinos
[arXiv:1903.04333]
 GO
High-energy cosmic neutrinos can reveal new fundamental particles and interactions, probing energy and distance scales far exceeding those accessible in the laboratory. This white paper describes the outstanding particle physics questions that high-energy cosmic neutrinos can address in the coming decade. [...]
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2019-07-15
16:18
OpenAccess [PUBDB-2019-02722] Preprint/Report
et al
Astrophysics Uniquely Enabled by Observations of High-Energy Cosmic Neutrinos
[arXiv:1903.04334]
 GO
High-energy cosmic neutrinos carry unique information about the most energetic non-thermal sources in the Universe. This white paper describes the outstanding astrophysics questions that neutrino astronomy can address in the coming decade. [...]
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2019-07-15
15:21
Embargoed OpenAccess [PUBDB-2019-02719] Journal Article
et al
Direct measurement of stellar angular diameters by the VERITAS Cherenkov telescopes
Nature astronomy 3(6), 511 - 516 () [10.1038/s41550-019-0741-z]  GO
The angular size of a star is a critical factor in determining its basic properties$^1$. Direct measurement of stellar angular diameters is difficult: at interstellar distances stars are generally too small to resolve by any individual imaging telescope. [...]
Published on 2019-04-15. Available in OpenAccess from 2019-10-15.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:520
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2019-07-15
15:12
Embargoed OpenAccess [PUBDB-2019-02716] Journal Article
et al
Towards open and reproducible multi-instrument analysis in gamma-ray astronomy
The analysis and combination of data from different gamma-ray instruments involves the use of collaboration proprietary software and case-by-case methods. The effort of defining a common data format for high-level data, namely event lists and instrument response functions (IRFs), has recently started for very-high-energy gamma-ray instruments, driven by the upcoming Cherenkov Telescope Array (CTA). [...]
Published on 2019-04-30. Available in OpenAccess from 2020-04-30.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-07-15
14:44
OpenAccess [PUBDB-2019-02713] Journal Article
et al
A Search for Pulsed Very High-energy Gamma-Rays from 13 Young Pulsars in Archival VERITAS Data
We conduct a search for periodic emission in the very high-energy (VHE) gamma-ray band (E > 100 GeV) from a total of 13 pulsars in an archival VERITAS data set with a total exposure of over 450 hr. The set of pulsars includes many of the brightest young gamma-ray pulsars visible in the Northern Hemisphere. [...]
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2019-05-07
16:16
OpenAccess [PUBDB-2019-02174] Journal Article
et al
Deep observations of the globular cluster M15 with the MAGIC telescopes
A population of globular clusters (GCs) has been recently established by the Fermi-LAT telescope as a new class of GeV γ-ray sources. Leptons accelerated to TeV energies, in the inner magnetospheres of MSPs or in their wind regions, should produce γ-rays through the inverse Compton scattering in the dense radiation field from the huge population of stars. [...]
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2019-05-07
15:45
Embargoed OpenAccess [PUBDB-2019-02172] Journal Article
et al
A GeV–TeV Measurement of the Extragalactic Background Light
The extragalactic background light (EBL) can be probed via the absorption imprint it leaves in the spectra of gamma-ray sources ($\gamma \gamma \to {e}^{-}{e}^{+}$). We recently developed a dedicated technique to reconstruct the EBL, and its evolution with redshift, from γ-ray optical depth data using a large sample of blazars detected by the Fermi Large Area Telescope. [...]
Published on 2019-03-22. Available in OpenAccess from 2020-03-22.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-04-08
14:54
[PUBDB-2019-01903] Journal Article
et al
Application of New Approximations of the Lateral Distribution of EAS Cherenkov Light in the Atmosphere
A new knee-like approximation of the lateral distribution function (LDF) of EAS Cherenkov light in the 30–3000 TeV energy range was proposed and tested with simulated showers in our earlier studies. This approximation fits the LDFs of individual showers accurately for all types of primary particles gamma-rays, protons, and nuclei) and is suitable for reconstructing the shower core, determining the energy, and separating gamma-induced showers from hadron-induced ones. [...]
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ddc:530
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