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61.
FermiandSwiftObservations of GRB 190114C: Tracing the Evolution of High-energyEmission from Prompt to Afterglow
Gabrijela Zaharijas, 2020, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ... gamma-ray bursts...
Ključne besede: gamma-ray bursts
Objavljeno: 20.02.2020; Ogledov: 1003; Prenosov: 46
.pdf Polno besedilo (1,71 MB)

62.
Search forγ-ray emission from dark matter particle interactions from theAndromeda and Triangulum galaxies with the Fermi Large Area Telescope
Gabrijela Zaharijas, 2019, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ... gamma rays, dark matter...
Ključne besede: gamma rays, dark matter
Objavljeno: 20.02.2020; Ogledov: 1032; Prenosov: 0
.pdf Polno besedilo (11,40 MB)

63.
Search for point sources of ultra-high-energy photons with the Telescope Array surface detector
J. P. Lundquist, R.U. Abbasi, 2020, izvirni znanstveni članek

Opis: The surface detector (SD) of the Telescope Array (TA) experiment allows us to detect indirectly photons with energies of the order of 10^18 eV and higher, and to separate photons from the cosmic ray background. In this paper, we present the results of a blind search for point sources of ultra-high-energy (UHE) photons in the Northern sky using the TA SD data. The photon-induced extensive air showers are separated from the hadron-induced extensive air shower background by means of a multivariate classifier based upon 16 parameters that characterize the air shower events. No significant evidence for the photon point sources is found. The upper limits are set on the flux of photons from each particular direction in the sky within the TA field of view, according to the experiment’s angular resolution for photons. The average 95 per cent confidence level upper-limits for the point-source flux of photons with energies greater than 10^18, 10^18.5, 10^19, 10^19.5 and 10^20 eV are 0.094, 0.029, 0.010, 0.0073 and 0.0058 km−2yr−1, respectively. For energies higher than 10^18.5 eV, the photon point-source limits are set for the first time. Numerical results for each given direction in each energy range are provided as a supplement to this paper.
Najdeno v: ključnih besedah
Povzetek najdenega: ...methods: data analysis, cosmic rays, gamma-rays: general...
Ključne besede: methods: data analysis, cosmic rays, gamma-rays: general
Objavljeno: 29.04.2020; Ogledov: 1008; Prenosov: 0
.pdf Polno besedilo (1,05 MB)

64.
Gamma Ray Showers Observed at Ground Level in Coincidence With Downward Lightning Leaders
J. P. Lundquist, R.U. Abbasi, 2018, izvirni znanstveni članek

Opis: Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders in lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700‐km^2 cosmic ray observatory located in southwestern Utah, USA. In data collected between 2014 and 2016, correlated observations showing the structure and temporal development of three shower‐producing flashes were obtained with a 3‐D lightning mapping array, and electric field change measurements were obtained for an additional seven flashes, in both cases colocated with the TASD. National Lightning Detection Network information was also used throughout. The showers arrived in a sequence of 2–5 short‐duration (≤10 μs) bursts over time intervals of several hundred microseconds and originated at an altitude of ≃3–5 km above ground level during the first 1–2 ms of downward negative leader breakdown at the beginning of cloud‐to‐ground lightning flashes. The shower footprints, associated waveforms and the effect of atmospheric propagation indicate that the showers consist primarily of downward‐beamed gamma radiation. This has been supported by GEANT simulation studies, which indicate primary source fluxes of ≃10^12–10^14 photons for 16° half‐angle beams. We conclude that the showers are terrestrial gamma ray flashes, similar to those observed by satellites, but that the ground‐based observations are more representative of the temporal source activity and are also more sensitive than satellite observations, which detect only the most powerful terrestrial gamma ray flashes.
Najdeno v: ključnih besedah
Ključne besede: gamma rays, lightning, gamma ray bursts, surface detector
Objavljeno: 30.04.2020; Ogledov: 1221; Prenosov: 0
.pdf Polno besedilo (1,14 MB)

65.
The bursts of high energy events observed by the telescope array surface detector
J. P. Lundquist, R.U. Abbasi, 2017, izvirni znanstveni članek

Opis: The Telescope Array (TA) experiment is designed to detect air showers induced by ultra high energy cosmic rays. The TA ground Surface particle Detector (TASD) observed several short-time bursts of air shower like events. These bursts are not likely due to chance coincidence between single shower events. The expectation of chance coincidence is less than 10^-4 for five-year's observation. We checked the correlation between these bursts of events and lightning data, and found evidence for correlations in timing and position. Some features of the burst events are similar to those of a normal cosmic ray air shower, and some are not. On this paper, we report the observed bursts of air shower like events and their correlation with lightning.
Najdeno v: ključnih besedah
Povzetek najdenega: ...High energy radiation, Lightning, Terrestrial gamma-ray flash...
Ključne besede: High energy radiation, Lightning, Terrestrial gamma-ray flash
Objavljeno: 30.04.2020; Ogledov: 1062; Prenosov: 0
.pdf Polno besedilo (1,70 MB)

66.
TeV dark matter search at the Galactic center with the CTA
Gabrijela Zaharijas, vabljeno predavanje na konferenci brez natisa

Najdeno v: ključnih besedah
Povzetek najdenega: ... gamma rays, dark matter, Cherenkov Telescope Array...
Ključne besede: gamma rays, dark matter, Cherenkov Telescope Array
Objavljeno: 16.05.2020; Ogledov: 954; Prenosov: 0
.pdf Polno besedilo (107,91 KB)
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67.
Fermi Large Area Telescope fourth source catalog
S. Abdollahi, F. Acero, M. Ajello, W. B. Atwood, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, Gabrijela Zaharijas, 2020, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...astronomy, gamma rays, sky surveys...
Ključne besede: astronomy, gamma rays, sky surveys
Objavljeno: 22.05.2020; Ogledov: 996; Prenosov: 42
.pdf Polno besedilo (2,55 MB)
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68.
Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
Serguei Vorobiov, Samo Stanič, Christopher Eckner, R. Adam, A. Acharyya, F. Acero, H. Abe, H. Abdalla, Gabrijela Zaharijas, Marko Zavrtanik, Danilo Zavrtanik, Miha Živec, 2021, izvirni znanstveni članek

Opis: The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of γ cosmology that can be explored as part of the Key Science Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic jets. Observations of AGN with CTA will enable a measurement of γ absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z=2 and to constrain or detect γ halos up to intergalactic-magnetic-field strengths of at least 0.3 pG . Extragalactic observations with CTA also show promising potential to probe physics beyond the Standard Model. The best limits on Lorentz invariance violation from γ astronomy will be improved by a factor of at least two to three. CTA will also probe the parameter space in which axion-like particles could constitute a significant fraction, if not all, of dark matter. We conclude on the synergies between CTA and other upcoming facilities that will foster the growth of γ cosmology.
Najdeno v: ključnih besedah
Ključne besede: Cherenkov Telescope Array, active galactic nuclei, gamma-ray experiments, axions, extragalactic magnetic fields
Objavljeno: 02.03.2021; Ogledov: 499; Prenosov: 21
URL Polno besedilo (0,00 KB)
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69.
On the GeV Emission of the Type I BdHN GRB 130427A
Laura Beccera, She Sheng Xue, Yu Wang, Narek Sahakyan, Mile Karlica, Yen-Chen Chen, Simonetta Filippi, Christian Cherubini, Carlo Luciano Bianco, Jorge Armando Rueda, Rahim Moradi, Remo Ruffini, 2019, izvirni znanstveni članek

Opis: We propose that the inner engine of a type I binary-driven hypernova (BdHN) is composed of Kerr black hole (BH) in a non-stationary state, embedded in a uniform magnetic field B_0 aligned with the BH rotation axis and surrounded by an ionized plasma of extremely low density of 10^−14 g cm−3. Using GRB 130427A as a prototype, we show that this inner engine acts in a sequence of elementary impulses. Electrons accelerate to ultrarelativistic energy near the BH horizon, propagating along the polar axis, θ = 0, where they can reach energies of ~10^18 eV, partially contributing to ultrahigh-energy cosmic rays. When propagating with $\theta \ne 0$ through the magnetic field B_0, they produce GeV and TeV radiation through synchroton emission. The mass of BH, M = 2.31M ⊙, its spin, α = 0.47, and the value of magnetic field B_0 = 3.48 × 10^10 G, are determined self consistently to fulfill the energetic and the transparency requirement. The repetition time of each elementary impulse of energy ${ \mathcal E }\sim {10}^{37}$ erg is ~10^−14 s at the beginning of the process, then slowly increases with time evolution. In principle, this "inner engine" can operate in a gamma-ray burst (GRB) for thousands of years. By scaling the BH mass and the magnetic field, the same inner engine can describe active galactic nuclei.
Najdeno v: ključnih besedah
Povzetek najdenega: ...this "inner engine" can operate in a gamma-ray burst (GRB) for thousands of years. By...
Ključne besede: black hole physics, binaries, gamma-ray burst, neutron stars, supernovae, Astrophysics - High Energy Astrophysical Phenomena
Objavljeno: 20.07.2020; Ogledov: 940; Prenosov: 0
.pdf Polno besedilo (1,09 MB)

70.
Constraining dark matter particle properties with Fermi-LAT and the Cherenkov Telescope Array
Christopher Eckner, 2020, doktorska disertacija

Najdeno v: ključnih besedah
Povzetek najdenega: ...dark matter, astroparticle physics, high-energy gamma-ray astronomy, cosmic rays, Imaging Atmospheric Cherenkov Telescope,...
Ključne besede: dark matter, astroparticle physics, high-energy gamma-ray astronomy, cosmic rays, Imaging Atmospheric Cherenkov Telescope, Cherenkov Telescope Array, Fermi Large Area Telescope
Objavljeno: 29.09.2020; Ogledov: 1151; Prenosov: 37
.pdf Polno besedilo (68,77 MB)

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