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Expected exclusion limits to TeV dark matter from the perseus cluster with the Cherenkov Telescope Array
Rémi Adam, Saptashwa Bhattacharyya, Judit Pérez Romero, Samo Stanič, Veronika Vodeb, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Miha Živec, 2023, objavljeni znanstveni prispevek na konferenci

Opis: Clusters of galaxies are the largest gravitationally-bound structures in the Universe. They are composed of galaxies and gas (approximately 15% of the total mass) mostly dark matter (DM, accounts up to 85% of the total mass). If the DM is composed of Weakly Interacting Massive Particles (WIMPs), galaxy clusters represent one of the best targets to search for gamma-ray signals induced by the decay of WIMPs, with masses around the TeV scale. Due to its sensitivity and energy range of operation (from 20 GeV to 300 TeV), the Cherenkov Telescope Array (CTA) Observatory has a unique opportunity to test WIMPs with masses close to the unitarity limit. This will complement the searches for DM from other gamma-ray observatories as well as direct and collider experiments. The CTA Observatory is planning to search for gamma-ray emission, either its origin may be cosmic-ray (CR) or DM related, in the Perseus galaxy cluster during the first years of operation. In this poster, we will present the software created to perform the analysis using the ctools software and the corresponding results.
Ključne besede: Cherenkov Telescope Array, CTA, dark matter, standard model, dwarf spheroidal galaxies
Objavljeno v RUNG: 26.09.2023; Ogledov: 759; Prenosov: 4
.pdf Celotno besedilo (1,33 MB)
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Changes in exhaled volatile organic compounds following indirect bronchial challenge in suspected asthma
Adam Peel, Ran Wang, Waqar Ahmed, Iain R. White, Maxim Wilkinson, Yoon K. Loke, Andrew M. Wilson, Stephen J. Fowler, 2023, izvirni znanstveni članek

Opis: Background Inhaled mannitol provokes bronchoconstriction via mediators released during osmotic degranulation of inflammatory cells, and, hence represents a useful diagnostic test for asthma and model for acute attacks. We hypothesised that the mannitol challenge would trigger changes in exhaled volatile organic compounds (VOCs), generating both candidate biomarkers and novel insights into their origin. Methods Participants with a clinical diagnosis of asthma, or undergoing investigation for suspected asthma, were recruited. Inhaled mannitol challenges were performed, followed by a sham challenge after 2 weeks in participants with bronchial hyper-responsiveness (BHR). VOCs were collected before and after challenges and analysed using gas chromatography–mass spectrometry. Results Forty-six patients (mean (SD) age 52 (16) years) completed a mannitol challenge, of which 16 (35%) were positive, and 15 of these completed a sham challenge. Quantities of 16 of 51 identified VOCs changed following mannitol challenge (p<0.05), of which 11 contributed to a multivariate sparse partial least square discriminative analysis model, with a classification error rate of 13.8%. Five of these 16 VOCs also changed (p<0.05) in quantity following the sham challenge, along with four further VOCs. In patients with BHR to mannitol distinct postchallenge VOC signatures were observed compared with post-sham challenge. Conclusion Inhalation of mannitol was associated with changes in breath VOCs, and in people with BHR resulted in a distinct exhaled breath profile when compared with a sham challenge. These differentially expressed VOCs are likely associated with acute airway inflammation and/or bronchoconstriction and merit further investigation as potential biomarkers in asthma.
Ključne besede: asthma, exhaled volatile organic compounds, pulmonology, breath metabolomics
Objavljeno v RUNG: 31.07.2023; Ogledov: 1012; Prenosov: 3
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Sensitivity of the Cherenkov Telescope Array to TeV photon emission from the Large Magellanic Cloud
A. Acharyya, R. Adam, Saptashwa Bhattacharyya, Samo Stanič, Veronika Vodeb, Serguei Vorobiov, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, Miha Živec, 2023, izvirni znanstveni članek

Opis: A deep survey of the Large Magellanic Cloud at ∼ 0.1−100 TeV photon energies with the Cherenkov Telescope Array is planned. We assess the detection prospects based on a model for the emission of the galaxy, comprising the four known TeV emitters, mock populations of sources, and interstellar emission on galactic scales. We also assess the detectability of 30 Doradus and SN 1987A, and the constraints that can be derived on the nature of dark matter. The survey will allow for fine spectral studies of N 157B, N 132D, LMC P3, and 30 Doradus C, and half a dozen other sources should be revealed, mainly pulsar-powered objects. The remnant from SN 1987A could be detected if it produces cosmic-ray nuclei with a flat power-law spectrum at high energies, or with a steeper index 2.3−2.4 pending a flux increase by a factor > 3−4 over ∼ 2015−2035. Large-scale interstellar emission remains mostly out of reach of the survey if its > 10 GeV spectrum has a soft photon index ∼ 2.7, but degree-scale 0.1 − 10 TeV pion-decay emission could be detected if the cosmic-ray spectrum hardens above >100 GeV. The 30 Doradus star-forming region is detectable if acceleration efficiency is on the order of 1 − 10% of the mechanical luminosity and diffusion is suppressed by two orders of magnitude within < 100 pc. Finally, the survey could probe the canonical velocity-averaged cross section for self-annihilation of weakly interacting massive particles for cuspy Navarro-Frenk-White profiles.
Ključne besede: very-high energy (VHE) gamma-rays, Cherenkov Telescope Array Observatory, Large Magellanic Cloud, pulsar wind nebulas, galaxiesstar-forming regions, cosmic rays, dark matter
Objavljeno v RUNG: 02.06.2023; Ogledov: 1212; Prenosov: 1
.pdf Celotno besedilo (3,66 MB)

MINOT: Modeling the intracluster medium (non-)thermal content and observable prediction tools
Rémi Adam, Hazal Gosku, A. Leingärtner-Goth, Steffano Ettori, R. Gnatyk, B. Hnatyk, Moritz Hütten, Judit Pérez Romero, Miguel Sánchez-Conde, Olga Sergijenko, izvirni znanstveni članek

Opis: In the past decade, the observations of diffuse radio synchrotron emission toward galaxy clusters revealed cosmic-ray (CR) electrons and magnetic fields on megaparsec scales. However, their origin remains poorly understood to date, and several models have been discussed in the literature. CR protons are also expected to accumulate during the formation of clusters and probably contribute to the production of these high-energy electrons. In order to understand the physics of CRs in clusters, combining of observations at various wavelengths is particularly relevant. The exploitation of such data requires using a self-consistent approach including both the thermal and the nonthermal components, so that it is capable of predicting observables associated with the multiwavelength probes at play, in particular in the radio, millimeter, X-ray, and γ-ray bands. We develop and describe such a self-consistent modeling framework, called MINOT (modeling the intracluster medium (non-)thermal content and observable prediction tools) and make this tool available to the community. MINOT models the intracluster diffuse components of a cluster (thermal and nonthermal) as spherically symmetric. It therefore focuses on CRs associated with radio halos. The spectral properties of the cluster CRs are also modeled using various possible approaches. All the thermodynamic properties of a cluster can be computed self-consistently, and the particle physics interactions at play are processed using a framework based on the Naima software. The multiwavelength observables (spectra, profiles, flux, and images) are computed based on the relevant physical process, according to the cluster location (sky and redshift), and based on the sampling defined by the user. With a standard personal computer, the computing time for most cases is far shorter than one second and it can reach about one second for the most complex models. This makes MINOT suitable for instance for Monte Carlo analyses. We describe the implementation of MINOT and how to use it. We also discuss the different assumptions and approximations that are involved and provide various examples regarding the production of output products at different wavelengths. As an illustration, we model the clusters Abell 1795, Abell 2142, and Abell 2255 and compare the MINOT predictions to literature data. While MINOT was originally build to simulate and model data in the γ-ray band, it can be used to model the cluster thermal and nonthermal physical processes for a wide variety of datasets in the radio, millimeter, X-ray, and γ-ray bands, as well as the neutrino emission.
Ključne besede: galaxy clusters, intracluster medium, cosmic rays, radiation mechanisms, numerical methods
Objavljeno v RUNG: 27.01.2023; Ogledov: 1033; Prenosov: 0
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Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
H. Abdalla, H. Abe, Fabio Acero, A. Acharyya, R. Adam, Christopher Eckner, Samo Stanič, Serguei Vorobiov, 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.
Ključne besede: Cherenkov Telescope Array, active galactic nuclei, gamma-ray experiments, axions, extragalactic magnetic fields
Objavljeno v RUNG: 02.03.2021; Ogledov: 2416; Prenosov: 72
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Anomaly detection in processing of complex syntax by early L2 learners
Arthur Stepanov, Sara Andreetta, Penka Stateva, Adam Zawiszewski, Itziar Laka, 35, izvirni znanstveni članek

Opis: This study investigates the processing of long-distance syntactic dependencies by native speakers of Slovenian (L1) who are advanced learners of Italian as a second language (L2), compared with monolingual Italian speakers. Using a self-paced reading task, we compare sensitivity of the early-acquired L2 learners to syntactic anomalies in their L2 in two empirical domains: (1) syntactic islands, for which the learners’ L1 and L2 grammars provide a converging characterization, and (2) verb–clitic constructions, for which the respective L1 and L2 grammatical descriptions diverge. We find that although our L2 learners show native-like processing patterns in the former, converging, grammatical domain, they may nevertheless perform non-native-like with respect to syntactic phenomena in which the L1 and L2 grammars do not align, despite the early age of L2 acquisition. Implications for theories of L2 acquisition and endstate are discussed.
Ključne besede: bilingualism, clitic, Italian, sentence processing, Slovenian, syntactic island
Objavljeno v RUNG: 21.02.2019; Ogledov: 3947; Prenosov: 113
.pdf Celotno besedilo (597,08 KB)

Nika Kravos, 2018, magistrsko delo

Opis: V magistrskem delu z naslovom Reprezentacije nosečnosti v izbranih delih sodobnih slovenskih avtoric po letu 1970 bom skušala osvetliti, kako sodobne slovenske avtorice upodabljajo motiv nosečnosti. Prvi del magistrskega dela bo obsegal pregled socioloških, zgodovinskih in psihoanalitičnih teorij o nosečnosti in materinstvu. Sociološki, zgodovinski in psihoanalitični kontekst bom v uvodni del vključila, ker so pomembni za razumevanje, kako je skozi različne perspektive prišlo do skonstruiranega mita o materinstvu. Osredotočila se bom na odnos ženskih likov do nosečnosti. Zanimal me bo odnos ženskega lika do nosečnosti, v kolikšni meri obravnavana besedila utelešajo/ne utelešajo stereotipnih, patriarhalnih vzorcev o nosečnosti in materinstvu in ali avtorice upodabljajo tudi tabuizirane teme (detomor, splav, poporodna depresija, konflikten odnos med materjo in otrokom, zavračanje misli, da je materinstvo največja izpolnitev ženskosti). Pri interpretaciji se bom opirala na feministične teoretičarke, citirala in analizirala bom njihove ugotovitve.
Ključne besede: feminizem, materinstvo, nosečnost, dojenje, porod, splav, detomor, stereotip, sodobnost, pisateljice
Objavljeno v RUNG: 11.10.2018; Ogledov: 5067; Prenosov: 196
.pdf Celotno besedilo (1,09 MB)

Esej na maturi 2019
Zoran Božič, Adrijana Špacapan, Andrej Adam, strokovna monografija

Opis: Didaktična predstavitev romanov Francoski testament in Angel pozabe (tematski sklop za pisanje eseja iz slovenščine na splošni maturi 2019).
Ključne besede: didaktika, francoska književnost, Andrei Makine, roman, slovenska književnost, avstrijska književnost, Maja Haderlap, Zoran Božič, Adrijana Špacapan, druga svetovna vojna, prva svetovna vojna, nemška taborišča, ruski gulagi, partizanski odpor, posledice vojne, narodna manjšina, nacizem, stalinizem, diktatura, Pariz
Objavljeno v RUNG: 04.06.2018; Ogledov: 5757; Prenosov: 0
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