31. The UHECR-FR0 radio galaxy connection : a multi-messenger study of energy spectra/composition emission and intergalactic magnetic field propagationJon Paul Lundquist, Lukas Merten, Serguei Vorobiov, Margot Boughelilba, Anita Reimer, Paolo Da Vela, Fabrizio Tavecchio, Giacomo Bonnoli, Chiara Righi, 2023, published scientific conference contribution Abstract: This study investigates low luminosity Fanaroff-Riley Type 0 (FR0) radio galaxies as a potentially
significant source of ultra-high energy cosmic rays (UHECRs). Due to their much higher prevalence
in the local universe compared to more powerful radio galaxies (about five times more than
FR-1s), FR0s may provide a substantial fraction of the total UHECR energy density. To determine
the nucleon composition and energy spectrum of UHECRs emitted by FR0 sources, simulation
results from CRPropa3 are fit to Pierre Auger Observatory data. The resulting emission spectral
indices, rigidity cutoffs, and nucleon fractions are compared to recent Auger results. The FR0 simulations
include the approximately isotropic distribution of FR0 galaxies and various intergalactic
magnetic field configurations (including random and structured fields) and predict the fluxes of
secondary photons and neutrinos produced during UHECR propagation through cosmic photon
backgrounds. This comprehensive simulation allows for investigating the properties of the FR0
sources using observational multi-messenger data.
Keywords: ultra-high energy cosmic rays, UHECR propagation, CRPropa, active galactic nuclei, jetted AGN, FR0 radio galaxies, Pierre Auger Observatory, UHECR energy spectrum
Published in RUNG: 24.08.2023; Views: 706; Downloads: 4
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32. Constraining the sources of ultra-high-energy cosmic rays across and above the ankle with the 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, 2023, original scientific article Abstract: In this work we present the interpretation of the energy spectrum and mass composition data as measured by the Pierre Auger Collaboration above 6 × 10[sup]17 eV. We use an astrophysical model with two extragalactic source populations to model the hardening of the cosmic-ray flux at around 5 × 10[sup]18 eV (the so-called "ankle" feature) as a transition between these two components. We find our data to be well reproduced if sources above the ankle emit a mixed composition with a hard spectrum and a low rigidity cutoff. The component below the ankle is required to have a very soft spectrum and a mix of protons and intermediate-mass nuclei. The origin of this intermediate-mass component is not well constrained and it could originate from either Galactic or extragalactic sources. To the aim of evaluating our capability to constrain astrophysical models, we discuss the impact on the fit results of the main experimental systematic uncertainties and of the assumptions about quantities affecting the air shower development as well as the propagation and redshift distribution of injected ultra-high-energy cosmic rays (UHECRs).
Keywords: ultra-high-energy cosmic rays, Pierre Auger Observatory, extensive air showers, UHECR propagation, UHECR energy spectrum, UHECR mass composition
Published in RUNG: 18.08.2023; Views: 709; Downloads: 8
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33. Recent results from the Pierre Auger ObservatorySerguei Vorobiov, 2022, published scientific conference contribution abstract (invited lecture) Abstract: Ultra-high-energy cosmic rays (UHECRs) are mostly protons and heavier nuclei arriving on Earth from space and producing particle cascades in the atmosphere, ”extensive air showers”. As of today, the most precise and high-statistics data set of the rare (≤ 1 particle per sq.km per year above 10[sup]19 eV) UHECR events is obtained by the Pierre Auger Observatory, a large area (~3000 sq.km) hybrid detector in Argentina. The Auger Observatory determines the arrival directions and energies of the primary UHECR particles and provides constraints for their masses.
In this talk, I will present and discuss the recent results, including the detailed measurements of the cosmic-ray energy spectrum features, the study of the anisotropies in the UHECR arrival directions at large and intermediate angular scales, the multi-messenger searches, and the inferred cosmic-ray mass composition. Finally, the progress of the current upgrade of the Observatory, "AugerPrime" which is aimed at improving the sensitivity to the mass composition of ultra-high-energy cosmic rays, will be presented.
Keywords: ultra-high-energy cosmic rays, Pierre Auger Observatory, UHECR mass composition, energy spectrum, anisotropies, AugerPrime upgrade
Published in RUNG: 23.12.2022; Views: 1385; Downloads: 7
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34. The atypical pattern of irony comprehension in autistic childrenFrancesca Panzeri, Greta Mazzaggio, Beatrice Giustolisi, Silvia Silleresi, Luca Surian, 2022, original scientific article Abstract: Nonliteral language understanding has always been recognized as problematic in autistic individuals. We ran a study on 26 autistic children (mean age = 7.3 years) and 2 comparison groups of typically developing children, 1 matched for chronological age, and 1 of younger peers (mean age = 6.11 years) matched for linguistic abilities, aiming at assessing their understanding of ironic criticisms and compliments, and identifying the cognitive and linguistic factors that may underpin this ability. Autistic participants lagged behind the comparison groups in the comprehension of both types of irony, and their performance was related to mindreading and linguistic abilities. Significant correlations were found between first-order Theory of Mind (ToM) and both types of irony, between second-order ToM and ironic compliments, and between linguistic abilities and ironic criticisms. The autistic group displayed an interesting, and previously unattested in the literature, bimodal distribution: the great majority of them (n = 18) displayed a very poor performance in irony understanding, whereas some (n = 6) were at ceiling. We discuss these results in terms of two different profiles of autistic children.
Keywords: irony, autism spectrum disorder, experimental pragmatics, theory of mind, irony comprehension
Published in RUNG: 05.05.2022; Views: 1483; Downloads: 0
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35. Carbon and Nitrogen K-Edge NEXAFS Spectra of Indole, 2,3-Dihydro-7-azaindole, and 3-FormylindoleAurora Ponzi, Elisa Bernes, Daniele Toffoli, Giovanna Fronzoni, Carlo Callegari, Alessandra Ciavardini, Michele Di Fraia, Robert Richter, Kevin Charles Prince, Hanan Sa'adeh, Michele Devetta, Davide Faccialà, Caterina Vozzi, Lorenzo Avaldi, Paola Bolognesi, Mattea Castrovilli, Daniele Catone, Marcello Coreno, Oksana Plekan, 2021, original scientific article Keywords: Carbon and nitrogen, General description, Hybrid functional, Near-edge X-ray absorption fine structure spectrum, Relevant features, Rydberg character, Theoretical spectra, Time dependent density functional theory
Published in RUNG: 19.01.2022; Views: 1837; Downloads: 0
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37. La comprensione dell'ironia in bambini con disturbi dello spettro autisticoGreta Mazzaggio, Francesca Panzeri, Beatrice Giustolisi, Luca Surian, 2018, published scientific conference contribution abstract Abstract: Comprendere l’ironia è un compito complesso che i bambini a sviluppo tipico compiono a partire dai sei anni. Diversi studi hanno evidenziato il ruolo della Teoria della Mente (ToM) e delle abilità linguistiche nella comprensione dell’ironia. Gli individui con Disturbi dello Spettro Autistico ad alto funzionamento (AAF) sono caratterizzati da abilità linguistiche intatte ma deficit nella ToM e nella pragmatica, a volte compensati mediante strategie linguistiche.
Obiettivo del nostro studio è indagare la comprensione dell’ironia (sia critiche che complimenti) in questa popolazione, al fine di individuare i fattori che la facilitano. I partecipanti sono 26 bambini con AAF (età media = 7,2) e 26 bambini a sviluppo tipico (ST) di pari età (p = .98), testati per QI non verbale, abilità linguistiche (sintassi e lessico), e ToM. Per la comprensione dell’ironia abbiamo creato un compito composto da 10 brevi storie che si concludono con un commento letterale (4, controllo) o ironico (3 complimenti e 3 critiche), a cui seguivano tre domande che richiedevano il riconoscimento del significato inteso, dell’atteggiamento del parlante, e del contesto (come controllo).
Entrambi i gruppi non hanno dimostrato difficoltà nel comprendere le storie letterali (AAF: 99%; ST: 99.5%). Attraverso un’analisi di regressione logistica abbiamo riscontrato una maggiore accuratezza di risposte per entrambe le tipologie di ironia (complimento e critica) nel gruppo a ST rispetto al gruppo di AAF (β = 8.25, SE = 2.52, z = 3.27, p = .001). In entrambi i gruppi l’accuratezza è stata maggiore per le critiche ironiche rispetto ai complimenti ironici (β = 0.90, SE = 0.32, z = 2.83, p = .005). L’analisi di correlazione di Pearson ha individuato come nel gruppo di AAF solo la ToM correli con la comprensione dell’ ironia (p < .001) mentre nel gruppo di bambini a ST, invece, al netto del fattore età solo le abilità sintattiche correlano (p = .03). Nel gruppo di AAF si evidenzia una netta distribuzione bimodale nelle risposte alle storie ironiche: la maggioranza dei bambini (16) ha dimostrato enormi difficoltà (accuratezza < 25%) mentre alcuni bambini (6) hanno dimostrato piena comprensione.
I bambini AAF mostrano un pattern atipico rispetto ai controlli a ST. Per spiegare questi dati ipotizziamo che i bambini con AAF con basse abilità di ToM, nella comprensione dell’ironia corrispondano al profilo degli individui AAF con deficit pragmatici e meta-rappresentazionali; i bambini con AAF che hanno una perfetta comprensione dell’ironia e alte abilità di ToM potrebbero utilizzare una strategia compensatoria, forse a seguito di una riabilitazione. Future ricerche di tipo
Keywords: irony, autism spectrum disorder, experimental pragmatics, theory of mind
Published in RUNG: 22.09.2021; Views: 2009; Downloads: 82
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38. Guess what? : comparing ad-hoc and scalar implicatures in children with autism spectrum disorderGreta Mazzaggio, Francesca Foppolo, Chiara Caretta, Remo Job, Luca Surian, 2017, published scientific conference contribution abstract Abstract: Pragmatic abilities of people with Autism Spectrum Disorder (ASD) have been the subject of extensive research, often considering their communicative problems as derived from their deficit in Theory of Mind (ToM). On the other hand, recent studies on the derivation of scalar implicatures (SIs)– such as some but not all that are built on certain lexical items ordered in an entailment scale based on their informativeness, e.g. "some, all" − found no differences between typical population and people with ASD. With our work we find out that TD group’s performance was significantly better in the ad-hoc condition than the ASD’s, and both groups’ performance was related to Age. With respect to the SIs condition, the TD group’s performance was numerically better than the ASD group, but the difference was not significant, which may be due to a lack of power. Moreover, there is again a positive relationship between Age and SI performance, but only for the TD group. For the ASD group, there are positive relationships between SI performance and ToM as well as the linguistic syntactic measure. These relationships suggest that there is something different underlying the two groups’ performance in the SI condition. In computing SIs, ASD children seem to rely mainly on their syntactic linguistic abilities, which in turn are strongly connected with ToM skills; this connection can be related with the syntactic complexity of ToM’s clauses that involve subordination e.g. You believe that I believe that you believe. On the other hand, given that the best predictor for ad-hoc implicatures computation in ASD children is Age, we may suggest that indeed there is a delay in the development of pragmatic abilities in ASD children, also confirmed by the lower ToM scores in the ASD group. In conclusion, it seems that the computation of SIs and ad-hoc implicatures rests on different computational mechanisms and future research should take this insight into consideration.
Keywords: theory of mind, scalar implicatures, adhoc implicatures, autism spectrum disorder
Published in RUNG: 21.09.2021; Views: 1940; Downloads: 51
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39. A diminished propensityto compute scalar implicaturesis linked to autistic traitsGreta Mazzaggio, Luca Surian, 2018, original scientific article Abstract: We investigated whether there is an association between autistic traits in the broader pheno- type and the ability to compute scalar implicatures. Previous studies found that the frequency of autistic traits is higher in students of science than of humanities. Here we recorded the frequency of rejection of underinformative scalar items in students enrolled either in a science or in a humanities curriculum and assessed their autistic traits using the Autism-Spectrum Quotient questionnaire. We found that rejec- tions were less frequent in science curricula students than in humanities curricula students. Moreover, rejections were associated negatively with autistic traits and positively with performance on Theory- of-Mind tasks. These findings suggest that autism cognitive phenotype is negatively associated with a propensity to spontaneously derive scalar implicatures.
Keywords: scalar implicatures, quantifiers, Autism-spectrum Quotient, pragmatics, theory of mind
Published in RUNG: 17.09.2021; Views: 1851; Downloads: 0
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40. The production of pronouns and verb inflections by Italian children with ASD : a new dataset in a null subject languageGreta Mazzaggio, Aaron Shield, 2020, original scientific article Abstract: The language of children with autism spectrum disorder (ASD) is often characterized by difficulties with pronouns. The underlying reasons for such difficulties are still unclear. This study is the first to test the abilities of children with ASD who speak Italian, a language in which overt subject pronouns are optional but verbs obligatorily feature person-referencing morphology. We found that Italian children with ASD were less accurate than typically-developing (TD) Italian children in the production of first-, second-, and third-person singular pronouns, avoiding pronouns in favor of nouns or names more often than controls. Moreover, children with ASD produced more overt pronouns than null pronouns in marked contexts, compared to TD children. These phenomena can be accounted for by difficulties with pragmatics.
Keywords: autism, autism spectrum disorder, pronoun production, pronoun avoidance, language development
Published in RUNG: 17.09.2021; Views: 1796; Downloads: 44
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