1. A Search for Ultra-high-energy Neutrinos from TXS 0506+056 Using the Pierre Auger ObservatoryMarko Zavrtanik, Lukas Zehrer, Danilo Zavrtanik, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, A. Aab, 2020, izvirni znanstveni članek Najdeno v: ključnih besedah
Ključne besede: ultra-high energy neutrinos, blazar TXS 0506+056, the Pierre Auger Observatory, high-energy astrophysics, neutrino astronomy, blazars, transient sources, active galaxies
Objavljeno: 20.10.2020; Ogledov: 2311; Prenosov: 0
 Polno besedilo (696,03 KB) |
2. The muon component of extensive air showers above 10[sup]17.5 eV measured with the Pierre Auger ObservatoryLukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, Federico Sánchez, 2019, objavljeni znanstveni prispevek na konferenci Najdeno v: ključnih besedah
Povzetek najdenega: ...ultra- high energy cosmic rays, Pierre Auger Observatory, extensive...
Ključne besede: ultra-high energy cosmic rays, Pierre Auger Observatory, extensive air showers, muon shower component
Objavljeno: 29.11.2020; Ogledov: 1886; Prenosov: 0
Polno besedilo (784,63 KB) |
3. The H.E.S.S. measurement of the cosmic-ray electron spectrumSerguei Vorobiov, Kathrin Egberts, 2010, objavljeni povzetek znanstvenega prispevka na konferenci Najdeno v: ključnih besedah
Povzetek najdenega: ...y-ray telescopes, H.E.S.S. system, Cherenkov telescopes, very high energy, cosmic-ray electrons, energy spectrum, ...
Ključne besede: ground based y-ray telescopes, H.E.S.S. system, Cherenkov telescopes, very high energy, cosmic-ray electrons, energy spectrum
Objavljeno: 25.04.2014; Ogledov: 4130; Prenosov: 23
 Polno besedilo (0,00 KB) |
4. Ultra-visokovakuumski sistem za naparevanje organskih polprevodnikovRobert Hudej, Gvido Bratina, 2001, izvirni znanstveni članek Opis: A new molecular-beam-epitaxy system for the growth of organic semiconductor layers was recently installed in the Laboratory for epitaxy and nanostructures of the Nova Gorica Polytechnic. The system is built around an ultra-high-vacuum chamber. The organic semiconductor material is evaporated from a low-temperature Knudsen cell. The system is equipped with a refraction high-energy electron-difraction system, a quadrupole mass spectrometer and a spectroscopic ellipsometer.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Polytechnic. The system is built around an ultra- high-vacuum chamber. The organic semiconductor material is evaporated... ...The system is equipped with a refraction high- energy electron-difraction system, a quadrupole mass spectrometer and...
Ključne besede: ultra-high vacuum, molecular-beam epitaxy, Knudsen cell, mass quadrupole spectrometer, spectroscopic ellipsometer, high-energy electrons
Objavljeno: 10.07.2015; Ogledov: 4613; Prenosov: 22
Polno besedilo (0,00 KB) |
5. The flux of ultra-high energy cosmic rays after ten years of operation of the Pierre Auger ObservatoryMarko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Inés Valiño, 2015, objavljeni znanstveni prispevek na konferenci Opis: The flux of ultra-high energy cosmic rays has been measured
with unprecedented precision at the Pierre Auger Observatory.
We report an update of the all-sky flux of cosmic rays above 3 x 10 [sup] 17 eV obtained by combining four
independent data sets. These measurements are based on data
from the surface detector arrays (divided into two sets according to the shower zenith angle), from a nested, denser,
detector array, and hybrid events measured simultaneously with
both the fluorescence detector and the surface detector array.
The spectral features are presented in detail and the
systematic uncertainties are addressed. The huge amount of data
collected to date, with a total exposure exceeding
50,000 km2 sr yr, together with the wide range of sky observed
(in declination from -90[deg] to 45[deg]) also allow us to
measure the energy spectrum from different regions of the sky.
We present the results of the search for a dependence of the
measured flux on the declination of the incoming directions.
Najdeno v: ključnih besedah
Ključne besede: ultra-high energy cosmic rays
energy spectrum
Pierre Auger Observatory
Objavljeno: 02.03.2016; Ogledov: 5027; Prenosov: 222
Polno besedilo (755,08 KB) |
6. Arrival directions of the highest-energy cosmic rays detected with the Pierre Auger ObservatoryMarko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Julien Aublin, 2015, objavljeni znanstveni prispevek na konferenci Opis: We present the results of a search for small to intermediate
scale anisotropies in the distribution of arrival directions
of ultra-high energy cosmic rays recorded at the Pierre Auger
Observatory. The data set, gathered in ten years of operation,
includes arrival directions with zenith angles up to 80◦,
and is about three times larger than that used in earlier
studies. We update the test based on correlations with active
galactic nuclei (AGNs) from the Véron-Cetty and Véron catalog,
which does not yield a significant indication of anisotropy
with the present data set. We perform a blind search for
localized excess fluxes and for self-clustering of arrival
directions at angular scales up to 30◦ and for different
energy thresholds between 40 EeV and 80 EeV. We also examine
the correlation of arrival directions with relatively nearby galaxies in the 2MRS catalog, AGNs detected by Swift-BAT,
and a sample of radio galaxies with jets and with the
Centaurus A galaxy. None of the searches shows a statistically
significant evidence of anisotropy. The two largest
departures from isotropy that were found have a post-trial
probability ≈ 1.4%. One is for cosmic rays with energy above
58 EeV that arrive within 15◦ of the direction toward
Centaurus A. The other is for arrival directions within 18◦
of Swift-BAT AGNs closer than 130 Mpc and brighter than
10[sup]44 erg/s, with the same energy threshold.
Najdeno v: ključnih besedah
Povzetek najdenega: ...in the distribution of arrival directions
of ultra- high energy cosmic rays recorded at the Pierre...
Ključne besede: ultra-high energy cosmic rays
anisotropy studies
active galactic nuclei
Pierre Auger Observatory
Objavljeno: 02.03.2016; Ogledov: 4497; Prenosov: 226
Polno besedilo (1,32 MB) |
7. Indications of anisotropy at large angular scales in the arrival directions of cosmic rays detected at the Pierre Auger ObservatoryMarko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Imen Al Samarai, 2015, objavljeni znanstveni prispevek na konferenci Opis: The large-scale distribution of arrival directions of
high-energy cosmic rays carries major clues to understanding
their origin. The Pierre Auger Collaboration have implemented
different analyses to search for dipolar and quadrupolar
anisotropies in different energy ranges spanning four orders
of magnitude. A common phase ≈270◦ of the first harmonic
modulation in right-ascension was found in adjacent energy intervals below 1 EeV, and another common phase ≈100◦
above 4 EeV. A constancy of phase measurements in ordered
energy intervals originating from a genuine anisotropy is
expected to appear with a smaller number of events than those
needed to achieve significant amplitudes. This led us to
design a prescribed test aimed at establishing whether
this consistency in phases is real at 99% CL. The test required
a total independent exposure of 21,000 km2 sr yr. We report on
the status of this prescription. We also report the results of
the search for a dipole anisotropy for cosmic rays with
energies above 4 EeV using events with zenith angles between
60◦ and 80◦. Compared to previous analyses of events with
zenith angles smaller than 60◦, this extension increases
the size of the data set by 30%, and enlarges the fraction of
exposed sky from 71% to 85%. The largest departure from
isotropy is found in the energy range above 8 EeV, with an
amplitude for the first harmonic in right ascension
r1 = (4.4 ± 1.0) × 10[sup]−2, that has a chance probability
P(≥ r1) = 6.4×10[sup]−5, reinforcing the hint previously
reported with vertical events alone.
Najdeno v: ključnih besedah
Povzetek najdenega: ...The large-scale distribution of arrival directions of
high-energy cosmic rays carries major clues to understanding...
Ključne besede: high-energy cosmic rays
large-scale distribution
anisotropy studies
Pierre Auger Observatory
Objavljeno: 02.03.2016; Ogledov: 4395; Prenosov: 233
Polno besedilo (862,90 KB) |
8. Search for energy dependent patterns in the arrival direction of cosmic rays at the Pierre Auger ObservatoryMarko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Tobias Winchen, 2015, objavljeni znanstveni prispevek na konferenci Opis: Energy-dependent patterns in the arrival directions of cosmic
rays are expected from deflections in galactic and extragalactic magnetic fields. We report on searches for such
patterns in the data of the surface detector of the Pierre
Auger Observatory at energies above E = 5 EeV in regions
within approximately 15◦ around events with energy E > 60
EeV. No significant patterns are found with this analysis which
can be used to constrain parameters in propagation scenarios.
Najdeno v: ključnih besedah
Povzetek najdenega: ...ultra- high energy cosmic rays
galactic and extragalactic magnetic fields
magnetic...
Ključne besede: ultra-high energy cosmic rays
galactic and extragalactic magnetic fields
magnetic deflection patterns
Pierre Auger Observatory
Objavljeno: 02.03.2016; Ogledov: 4387; Prenosov: 226
Polno besedilo (1019,52 KB) |
9. Composition at the “ankle” measured by the Pierre Auger Observatory: pure or mixed?Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Alexey Yushkov, 2015, objavljeni znanstveni prispevek na konferenci Opis: We report for the first time on the measurement of the
correlation between the depth of shower maximum and the signal
in water-Cherenkov stations for events reconstructed by both
the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlated measurement is a unique feature
of a hybrid air-shower observatory and allows us to determine
the purity of the cosmic-ray composition. The observed
correlation in the energy range around the “ankle”
lg(E/eV) = 18.5−19.0 differs significantly from the expectations for pure beams, indicating that the primary composition in this range is mixed, unless the
hadronic interactions at these energies behave very
differently than in conventional, LHC-tuned event generators.
Najdeno v: ključnih besedah
Povzetek najdenega: ...ultra- high energy cosmic rays,
elemental composition,
depth of shower maximum,
secondar...
Ključne besede: ultra-high energy cosmic rays, elemental composition, depth of shower maximum, secondary cosmic rays, Pierre Auger Observatory
Objavljeno: 02.03.2016; Ogledov: 4505; Prenosov: 233
Polno besedilo (388,00 KB) |
10. Update of the neutrino and photon limits from the Pierre Auger ObservatoryMarko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Carla Bleve, 2015, objavljeni znanstveni prispevek na konferenci Opis: Ultra-high energy neutrinos and photons, with energies above
1 EeV and 10 EeV respectively, can be detected with the Surface
Detector array (SD) of the Pierre Auger Observatory. Downward-
going neutrinos of all flavours interacting in the atmosphere
at zenith angles θ > 60◦, upward-going tau neutrinos (“Earth-
skimming”), as well as photons in the zenith range 30◦ − 60◦
can be identified through the broad time-structure of the
signals expected to be induced in the SD stations. An
additional signature for photon-induced air showers is the
steeper lateral distribution of secondary particles at ground
with respect to the nucleonic showers. Stringent limits are set
to the diffuse flux of ultra-high energy (UHE) neutrinos and
photons, using data collected between 2004 and mid-2013, under
the hypothesis of an E[sup]−2 spectrum for signal primaries.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Ultra- high energy neutrinos and photons, with energies above...
Ključne besede: ultra-high energy neutrinos, ultra-high energy photons, cosmic rays, elemental composition, Pierre Auger Observatory
Objavljeno: 03.03.2016; Ogledov: 4069; Prenosov: 223
Polno besedilo (398,21 KB) |
