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31.
Search for point sources of ultra-high-energy photons with the Telescope Array surface detector
R.U. Abbasi, Jon Paul Lundquist, 2020, original scientific article

Abstract: 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.
Keywords: methods: data analysis, cosmic rays, gamma-rays: general
Published in RUNG: 29.04.2020; Views: 2710; Downloads: 0
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32.
Search forγ-ray emission from dark matter particle interactions from theAndromeda and Triangulum galaxies with the Fermi Large Area Telescope
Gabrijela Zaharijas, 2019, original scientific article

Keywords: gamma rays, dark matter
Published in RUNG: 20.02.2020; Views: 2601; Downloads: 0
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33.
Unresolved Gamma-Ray Sky through its Angular Power Spectrum
Gabrijela Zaharijas, 2018, original scientific article

Keywords: gamma rays, Fermi LAT, isotropic emission
Published in RUNG: 20.12.2018; Views: 3117; Downloads: 0
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34.
A gamma-ray determination of the Universe ’ s star formation history
Gabrijela Zaharijas, Marco Ajello, 2018, original scientific article

Keywords: gamma rays, Fermi LAT, Extragalactic Background LIght
Published in RUNG: 05.12.2018; Views: 3182; Downloads: 0
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35.
36.
The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope
Gabrijela Zaharijas, 2018, original scientific article

Keywords: BL Lacertae objects, gamma rays, ISM: H II Regions, ISM: supernova remnants
Published in RUNG: 23.08.2018; Views: 3562; Downloads: 0
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37.
Fermi -LAT Observations of LIGO / Virgo Event GW170817
Gabrijela Zaharijas, 2018, original scientific article

Keywords: gamma-ray burst, gamma rays, gravitational waves
Published in RUNG: 23.08.2018; Views: 3619; Downloads: 0
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38.
Performance of the Cherenkov Telescope Array
G. Maier, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution

Keywords: CTA, Monte Carlo simulations, gamma rays
Published in RUNG: 16.02.2018; Views: 3314; Downloads: 138
.pdf Full text (321,78 KB)

39.
The Dark Matter Programme of the Cherenkov Telescope Array
A. Morselli, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution

Keywords: dark matter, CTA, gamma rays
Published in RUNG: 16.02.2018; Views: 3303; Downloads: 153
.pdf Full text (769,34 KB)

40.
Cherenkov Telescope Array: The Next Generation Gamma-ray Observatory
Rene A. Ong, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Marko Zavrtanik, Danilo Zavrtanik, 2017, published scientific conference contribution

Abstract: The Cherenkov Telescope Array (CTA) will be the next-generation gamma-ray observatory, investigating gamma-ray and cosmic ray astrophysics at energies from 20 GeV to more than 300 TeV. The observatory, consisting of large arrays of imaging atmospheric Cherenkov telescopes in both the southern and northern hemispheres, will provide full-sky coverage and will achieve a sensitivity improved by up to an order of magnitude compared to existing instruments such as H.E.S.S., MAGIC and VERITAS. CTA is expected to discover hundreds of new TeV gammaray sources, allowing it to significantly advance our understanding of the origin of cosmic rays, to probe much larger distances in the universe, and to search for WIMP dark matter with unprecedented sensitivity in TeV mass range. The development of CTA is being carried out by a worldwide consortium of scientists from 32 countries. Consortium scientists have developed the core scientific programme of CTA and institutes of the Consortium are expected to provide the bulk of the CTA components. The construction of CTA is overseen by the CTA Observatory that will in the future manage observatory operations, the guest observer programme, and data dissemination. This talk will review the scientific motivation for CTA, focusing on the key science projects that form the core programme of research. The talk will outline the design of CTA, including the science drivers, overall concept, performance optimization, and array layouts. The current status of CTA, including sites, prototype telescope progress, and steps forward will also be described.
Keywords: CTA, next-generation gamma-ray observatory, gamma rays
Published in RUNG: 16.02.2018; Views: 3939; Downloads: 140
.pdf Full text (1,35 MB)

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