171. Constraining models for the origin of ultra-high-energy cosmic rays with spectrum, composition, and arrival direction data measured at the Pierre Auger ObservatoryTeresa Bister, Andrej Filipčič, Jon Paul Lundquist, Shima Ujjani Shivashankara, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, 2023, objavljeni znanstveni prispevek na konferenci Opis: The distribution of cosmic-ray arrival directions shows a better agreement with models in which a fraction of the flux is associated with catalogs of nearby source candidates, such as starburst galaxies, than with isotropy. To investigate this further, we use a novel approach, fitting simultaneously the energy spectrum, distributions of shower maxima, and arrival directions at the highest
energies measured with the Pierre Auger Observatory. The astrophysical model consists of homogeneously distributed background sources as well as an adaptable contribution from nearby source candidates. Propagation effects and a rigidity-dependent magnetic field blurring are taken into account, producing a rising level of anisotropy with the energy. We demonstrate that a model containing a flux fraction of around 20% from the starburst galaxy catalog at 40 EeV, with a hard, nitrogen-dominated injection spectrum, provides a good description of the data. By investigating a scenario with Cen A as a single source in combination with the homogeneous background, we
show that this region of the sky provides the dominant part to the observed anisotropy signal. Models based on jetted active galactic nuclei whose cosmic-ray flux scales with the gamma-ray emission are disfavored. The modeled energy evolution of the arrival directions, the spectra of individual sources, as well as the statistical significance of the results, including the influence of experimental systematic effects, will be discussed in this contribution.
Ključne besede: anisotropies, Pierre Auger Observatory, ultra-high energy cosmic-rays, arrival directions
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172. An update on the arrival direction studies made with data from the Pierre Auger ObservatoryGeraldina Golup, Andrej Filipčič, Jon Paul Lundquist, Shima Ujjani Shivashankara, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, 2023, objavljeni znanstveni prispevek na konferenci Opis: The search for anisotropies in the arrival directions of ultra-high-energy cosmic rays plays a key role in the efforts to understand their origin. The observed first-harmonic modulation in right ascension above 8 EeV, detected by the Pierre Auger Observatory with a current significance of 6.9�, suggests an extragalactic origin above this energy. Furthermore, there are indications, at the ∼4� significance level, of anisotropies at intermediate angular scales, which are obtained when comparing the arrival directions against the distribution of potential sources from astrophysical catalogs, in particular that of nearby starburst galaxies, and around the Centaurus region. In this contribution, we present the status of the different searches for anisotropies at small, intermediate
and large angular scales. We use the latest available data set, with 19 years of operation that has yielded 135,000 km^2 yr sr of accumulated exposure, covering the sky at declinations from −90◦ to
45◦. At small and intermediate scales, we report updates of the all-sky blind search for localized excesses, the study around the Centaurus region, and the likelihood analysis with catalogs of
candidate sources. We have also studied the regions of the sky from which the Telescope Array Collaboration has reported hints of excesses in their data and we find no significant effects in
the same directions with a data set of comparable size. At large angular scales, the dipolar and quadrupolar amplitudes in energy bins are updated. We discuss the prospects of these searches,
both in regards to increases in statistics and in relation to the future inclusion of event-by-event mass estimators in these analyses through the upgrade of the Observatory, AugerPrime.
Ključne besede: anisotropies, Pierre Auger Observatory, ultra-high energy cosmic-rays, arrival directions
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173. Depth of maximum of air-shower profiles : testing the compatibility of the measurements at the Pierre Auger Observatory and the Telescope ArrayA. Abdul Halim, Andrej Filipčič, Jon Paul Lundquist, Shima Ujjani Shivashankara, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, 2023, objavljeni znanstveni prispevek na konferenci Opis: The Pierre Auger Observatory (Auger) and the Telescope Array (TA), located, respectively, in the Southern and Northern hemispheres, are the largest ultra-high-energy cosmic ray (UHECR) observatories. The Auger and TA Collaborations have collected unprecedented statistics providing us with a unique opportunity to search for the differences between the UHECR energy spectra and mass compositions in the complementary sky regions. To correctly attribute such differences to
the properties of the UHECR sources or propagation, the systematic effects in the measurements of each observatory should be considered properly. In this context, the task of the Auger – TA mass composition working group is to identify possible differences of astrophysical origin in the measurements of the depth of the maximum of air-shower profiles, X_max, performed at both observatories using the fluorescence technique. Due to distinct approaches to event selection and analysis atAuger and TA, theworking group uses a specially designed method to transfer the Auger X_max distributions into the TA detector. To this end, dedicated air-shower and detector simulations for the TA Black Rock Mesa and Long Ridge fluorescence detector stations were performed with the Sibyll 2.3d hadronic interaction model. From the comparison of the first two moments and the shapes of X_max distributions for energies above 10^18.2 eV, no significant differences between the Auger and TA measurements were found.
Ključne besede: Pierre Auger Observatory, Telescope Array, ultra-high energy cosmic rays, fluorescence detectors
Objavljeno v RUNG: 22.01.2024; Ogledov: 449; Prenosov: 5
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174. Constraining models for the origin of ultra-high-energy cosmic rays with a novel combined analysis of arrival directions, spectrum, and composition data measured at the Pierre Auger ObservatoryA. Abdul Halim, Andrej Filipčič, Jon Paul Lundquist, Shima Ujjani Shivashankara, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, 2024, izvirni znanstveni članek Opis: The combined fit of the measured energy spectrum and shower maximum depth
distributions of ultra-high-energy cosmic rays is known to constrain the parameters of
astrophysical models with homogeneous source distributions. Studies of the distribution of
the cosmic-ray arrival directions show a better agreement with models in which a fraction of
the flux is non-isotropic and associated with the nearby radio galaxy Centaurus A or with
catalogs such as that of starburst galaxies. Here, we present a novel combination of both
analyses by a simultaneous fit of arrival directions, energy spectrum, and composition data
measured at the Pierre Auger Observatory. The model takes into account a rigidity-dependent magnetic field blurring and an energy-dependent evolution of the catalog contribution shaped by interactions during propagation.
We find that a model containing a flux contribution from the starburst galaxy catalog
of around 20% at 40 EeV with a magnetic field blurring of around 20◦ for a rigidity of
10EV provides a fair simultaneous description of all three observables. The starburst galaxy
model is favored with a significance of 4.5σ (considering experimental systematic effects)
compared to a reference model with only homogeneously distributed background sources.
By investigating a scenario with Centaurus A as a single source in combination with the
homogeneous background, we confirm that this region of the sky provides the dominant
contribution to the observed anisotropy signal. Models containing a catalog of jetted active
galactic nuclei whose flux scales with the γ-ray emission are, however, disfavored as they
cannot adequately describe the measured arrival directions.
Ključne besede: ultra high energy cosmic rays, cosmic ray experiments, Pierre Auger Observatory, active galactic nuclei
Objavljeno v RUNG: 19.01.2024; Ogledov: 446; Prenosov: 7
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178. Srpski i slovenački postmodernizam oči u oči : (Tanja Tomazin, Roman u istoriji, istorija u romanu: srpski roman, slovenački roman i njihova postmodernizacija. Beograd: Službeni glasnik, 2022, 243 str.)Darko Ilin, 2023, recenzija, prikaz knjige, kritika Ključne besede: Rezenzija, postmodernizam, Tanja Tomazin, komparatistika
Objavljeno v RUNG: 16.01.2024; Ogledov: 530; Prenosov: 4
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179. Wikisource platforma kao biblioteka slovenačke književnosti i kultureDarko Ilin, 2023, izvirni znanstveni članek Opis: Cilj ovog rada je da predstavi projekat Wikisource u kontekstu slovenačke kulture i književnosti. Značaj digitalizacije i digitalne humanistike u savremenom društvu veoma je naglašen. Sve više pažnje se pridaje transformisanju štampanog teksta u digitalnu građu, čime bi se demokratizovao pristup bogatstvu baštine jedne kulture. Promenom medija i književni tekstovi menjaju svoj ontološki status, čime se usložnjava proces čitanja zbog postepenog napuštanja kulture štampane knjige, a što značajno obeležava savremenu čitalačku zajednicu. Zato je projekat Mirana Hladnika veoma važan za razumevanje čitanja u digitalnom okruženju jer za cilj ima kreiranje jedinstvene biblioteke slovenačke književnosti na internetu, ali i za
omogućavanje korisnicima i korisnicama da se susretnu sa tekstualnom građom koja nije poznata ili se ne nalazi u kanonu kulturnih tekstova. Integrativni pristup Mirana Hladnika, koji je u ovaj projekat uključio i studente ljubljanske slovenistike, pokazao se kao uspešan. Ovaj rad nastoji da osvetli različite aspekte nastajanja i značaja Vikizvornika, kao platforme slovenačke kulture i književnosti, kao i pitanja koja su se pojavila tokom njegovog nastanka
Ključne besede: Vikizvornik, Miran Hladnik, digitalizacija, tekstualnost, kulturna baština
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180. Number mismatch effect and processing cataphora in a pro-drop language : the case of SlovenianMatic Pavlič, Arthur Stepanov, 2023, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Opis: Cataphora (also known as backward anaphora) is a type of pronominals that prcede their antecedents elinearly. Previous research on processing cataphora has explored the idea that cataphoric pronouns trigger a forward-looking active search for an antecedent to establish a coreference relation similar to a filler-gap dependency between a fronted wh-phrase and its base-generated syntactic position
(Cowart & Cairns 1987). Van Gompel & Liversedge (2003) have shown that in an active search, the parser establishes a cataphoric coreference before considering pronominal phi-features. This results in a gender mismatch effect: sentences with incongruent incoming NP antecedents were more difficult to read than their congruent counterparts, as evidenced by slower reading times and eye movement regressions. In this paper, we report the results of a self-paced reading experiment in which the active search hypothesis is further tested by examining online cataphora resolution with respect to the number feature in Slovenian, a pro-drop language with a rich nominal and verbal morphology.
Ključne besede: cataphora, feature mismatch effect, forward-looking active search, self-paced reading, Slovenian, psycholinguistics
Objavljeno v RUNG: 16.01.2024; Ogledov: 506; Prenosov: 8
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