121. Inferences on mass composition and tests of hadronic interactions from 0.3 to 100 EeV using the water-Cherenkov detectors of the Pierre Auger ObservatoryA. Aab, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Mohamed Saleh Hassanin Khalil, Samo Stanič, Marta Trini, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, original scientific article Keywords: hadronske interakcije, modeli, kozmični žarki, ekstremne energije, Observatorij Pierre Auger
Published in RUNG: 25.01.2018; Views: 3295; Downloads: 0
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122. Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus AJagdish Joshi, Marlui Miranda, Lili Yang, Soebur Razzaque, 2017, published scientific conference contribution abstract Abstract: The association of at least a dozen ultrahigh-energy cosmic-ray (UHECR) events with energy 54 EeV or higher detected by the Pierre Auger Observatory from the direction of Centaurus-A, the nearest radio galaxy, supports the scenario of UHECR acceleration in the jets of radio galaxies. Multiwavelength observations of Centaurus-A suggest that the inner jet is likely the site for particle acceleration, which emits in X-ray to very high-energy (VHE) gamma-ray. We model broadband spectral energy distribution with emission from shock-accelerated electrons and protons in a combined synchrotron-self-Compton and photo-hadronic scenario. The UHECR flux from Centaurus-A, required to explain Pierre Auger data, successfully explains observed VHE gamma rays as photo-hadronic emission.
Keywords: Centaurus A, gamma ray, cosmic rays
Published in RUNG: 17.01.2018; Views: 3228; Downloads: 0
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123. High-Energy Astroparticle DetectionLili Yang, invited lecture at foreign university Abstract: Astroparticle Physics has evolved as a new interdisciplinary field at the intersection of particle physics, astronomy and cosmology, addressing some of the most fundamental questions of contemporary physics. Neutrinos, cosmic rays, gamma rays and also gravitational waves as the cosmic messengers, take the information from the universe to tell us more about those energetic astro phenomena. Physicists have been developing experiments to detect and study these messengers. I would like to talk about the basic ideas and searching results from the dedicate cosmic ray detector Pierre Auger Observatory and also the future performance of Cherenkov Telescope Array (CTA), the next-generation ground based telescope array. CTA will play an very important role in detecting GeV-TeV gamma rays and represents the era of precision gamma ray astronomy. The multi-messenger and multi-wavelength study with various messengers are the main field in astrophysics.
Keywords: Cherenkov Telescope Array
Published in RUNG: 17.01.2018; Views: 3712; Downloads: 0
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124. Astroparticle studies at the Pierre Auger ObservatoryLili Yang, invited lecture at foreign university Abstract: The Pierre Auger Observatory (PAO), the world’s largest cosmic ray detector combines a large surface detector (SD) with an air fluorescence detector (FD). It is designed to observe extensive air showers (EAS) of billions of secondary particles induced by the UHECRs in the earths’ atmosphere. The “hybrid” design (i.e., detected simultaneously by SD and FD) provides wealth of information about shower development and excellent event reconstruction. Together with observations of UHECRs, the Surface Detector (SD) of the PAO is sensitive to UHE neutrinos through the observation of deeply initiated inclined down-going showers produced by neutrino interactions in the atmosphere, which method has been well established. On the other hand, high-energy photons can also be discriminated from background of charged cosmic rays based on their characters of the shower front. In this talk, I will give a review on recent results from PAO and introduce the ultra-high energy multi-messenger studies from PAO.
Keywords: Pierre Auger Observatory, cosmic rays, ultra-high energy
Published in RUNG: 17.01.2018; Views: 3755; Downloads: 0
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125. Multi-messenger study with the Pierre Auger ObservatoryLili Yang, unpublished invited conference lecture Abstract: The Pierre Auger Observatory is the largest cosmic ray detector in the world, studying particles with energy above 10^17 eV. Even though Auger is dedicated to charged cosmic rays, it’s also sensitive to ultra-high energy neutral particles, such as photons, neutrinos and neutrons, which are undeflected by magnetic field and pointing back to the source site. More exciting, with the breakthrough observations of gravitational-wave signal, the new era of multi-messenger analysis has come. I will present the recent results and prospects of multi-messenger study with Auger and also the first joint detection of gravitational and electromagnetic radiation from the source, with a focus on the UHE neutrino search.
Keywords: Pierre Auger Observatory, multi-messenger, neutrino, gravitational wave
Published in RUNG: 17.01.2018; Views: 3990; Downloads: 0
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126. Search for High-energy Neutrinos from Binary Neutron Star Merger GW170817Arnauld Albert, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Mohamed Saleh Hassanin Khalil, Samo Stanič, Marta Trini, Serguei Vorobiov, Lili Yang, Marko Zavrtanik, Danilo Zavrtanik, 2017, original scientific article Keywords: izbruhi žarkov gama, gravitacijski valovi, nevtrini
Published in RUNG: 15.12.2017; Views: 3597; Downloads: 0
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127. Calibration of the logarithmic-periodic dipole antenna (LPDA) radio stations at the Pierre Auger Observatory using an octocopterA. Aab, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Mohamed Saleh Hassanin Khalil, Samo Stanič, Marta Trini, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, original scientific article Keywords: Kalibracija, dipolna antena, oktokopter, observatorij Pierre Auger
Published in RUNG: 23.10.2017; Views: 3803; Downloads: 0
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128. Multi-messenger Observations of a Binary Neutron Star MergerAndrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Marko Zavrtanik, Benjamin Abbott, Danilo Zavrtanik, 2017, original scientific article Keywords: gravitacijski valovi, nevtronske zvezde, izbruhi žarkov gama, nevtrini, optični teleskopi
Published in RUNG: 20.10.2017; Views: 3733; Downloads: 254
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129. Science with the Cherenkov Telescope ArrayGašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Marko Zavrtanik, B.S. Acharya, Danilo Zavrtanik, 2017, scientific monograph Keywords: astronomija z gama žarki, ekstremna okolja v vesolju, izvori relativističnih kozmičnih žarkov, nevtronske zvezde, črne luknje, temna snov, gravitacija
Published in RUNG: 04.10.2017; Views: 4962; Downloads: 203
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130. Spectral calibration of the fluorescence telescopes of the Pierre Auger ObservatoryAndrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Marko Zavrtanik, A. Aab, Danilo Zavrtanik, 2017, original scientific article Keywords: dušikova fluorescenca, kalibracija, Observatorij Pierre Auger
Published in RUNG: 29.09.2017; Views: 3852; Downloads: 0
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