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Hypnosis or curriculum for a more humanistic space exploration
2020, radijska ali televizijska oddaja, podkast, intervju, novinarska konferenca

Ključne besede: planetary art, poetics, humanities, curriculum, universe humanism, transhumanism, cosmism
Objavljeno v RUNG: 29.01.2021; Ogledov: 2449; Prenosov: 19
URL Povezava na celotno besedilo

Studying TDEs in the era of LSST
Katja Bricman, Andreja Gomboc, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: The observing strategy with continuous scanning and large sky coverage of the upcoming ground-based Large Synoptic Survey Telescope (LSST) will make it a perfect tool in search of rare transients, such as Tidal Disruption Events (TDEs). Bright optical flares resulting from tidal disruption of stars by their host supermassive black hole (SMBH) can provide us with important information about the mass of the SMBH involved in the disruption and thus enable the study of quiescent SMBHs, which represent a large majority of SMBHs found in centres of galaxies. These types of transients are extremely rare, with only about few tens of candidates discovered so far. It is expected that the LSST will provide a large sample of new TDE light curves. Here we present simulations of TDE observations using an end-to-end LSST simulation framework. Based on the analysis of simulated light curves we estimate the number of TDEs with good quality light curves the LSST is expected to discover in 10 years of observations. In addition, we investigate whether TDEs observed by the LSST could be used to probe the SMBH mass distribution in the universe. The participation at this conference is supported by the Action CA16104 Gravitational waves, black holes and fundamental physics (GWverse), supported by COST (European Cooperation in Science and Technology).
Objavljeno v RUNG: 04.01.2021; Ogledov: 2947; Prenosov: 0

Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-High Energy Cosmic Rays
R. Abbasi, Jon Paul Lundquist, 2020, izvirni znanstveni članek

Opis: Evidence for a large-scale supergalactic cosmic ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high energy cosmic ray (UHECR) energies above 10^19 eV using seven years of data from the Telescope Array (TA) surface detector and updated to 10 years. Previous energy-position correlation studies have made assumptions regarding magnetic field shapes and strength, and UHECR composition. Here the assumption tested is that, since the supergalactic plane is a fit to the average matter density of the local Large Scale Structure (LSS), UHECR sources and intervening extragalactic magnetic fields are correlated with this plane. This supergalactic deflection hypothesis is tested by the entire field-of-view (FOV) behavior of the strength of intermediate-scale energy-angle correlations. These multiplets are measured in spherical cap section bins (wedges) of the FOV to account for coherent and random magnetic fields. The structure found is consistent with supergalactic deflection, the previously published energy spectrum anisotropy results of TA (the hotspot and coldspot), and toy-model simulations of a supergalactic magnetic sheet. The seven year data post-trial significance of this supergalactic structure of multiplets appearing by chance, on an isotropic sky, is found by Monte Carlo simulation to be 4.19σ. The ten years of data post-trial significance is 4.09σ. Furthermore, the starburst galaxy M82 is shown to be a possible source of the TA Hotspot, and an estimate of the supergalactic magnetic field using UHECR measurements is presented.
Ključne besede: astroparticle physics, cosmic rays, UHECR, supergalactic plane, multiplets, magnetic deflection, large-scale structure of universe
Objavljeno v RUNG: 19.05.2020; Ogledov: 3069; Prenosov: 0
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Razumevanje vesolja danes/The evolving view of our universe-a »one step at a time« journey : Participation at the 25. Festival Znanosti
Gabrijela Zaharijas, druga izvedena dela

Ključne besede: dark matter, universe
Objavljeno v RUNG: 16.05.2020; Ogledov: 2832; Prenosov: 0
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Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays E ≥ 10^19.2 eV with the Telescope Array Surface Detector
R.U. Abbasi, Jon Paul Lundquist, 2018, izvirni znanstveni članek

Opis: Evidence for an intermediate-scale energy spectrum anisotropy has been found in the arrival directions of ultra-high energy cosmic rays for energies greater than 10^19.2 eV in the northern hemisphere using 7 years of Telescope Array surface detector data. A relative energy distribution test is done comparing events inside oversampled spherical caps of equal exposure, to those outside, using the Poisson likelihood ratio. The center of maximum significance is at 9h16m, 45°, and has a deficit of events with energies 10^19.2 ≤ E < 10^19.75 eV and an excess for E ≥ 10^19.75 eV. The post-trial probability of this energy anisotropy, appearing by chance anywhere on an isotropic sky, is found by Monte Carlo simulation to be 9 × 10−5 (3.74σ global).
Ključne besede: astroparticle physics, cosmic rays, anisotropy, large-scale structure of universe
Objavljeno v RUNG: 24.04.2020; Ogledov: 3310; Prenosov: 199
.pdf Celotno besedilo (1,43 MB)

Indications of Intermediate-Scale Anisotropy of Cosmic Rays with Energy Greater Than 57 EeV in the Northern Sky Measured with the Surface Detector of the Telescope Array Experiment
R.U. Abbasi, Jon Paul Lundquist, 2014, izvirni znanstveni članek

Opis: We have searched for intermediate-scale anisotropy in the arrival directions of ultrahigh-energy cosmic rays with energies above 57 EeV in the northern sky using data collected over a 5 year period by the surface detector of the Telescope Array experiment. We report on a cluster of events that we call the hotspot, found by oversampling using 20∘-radius circles. The hotspot has a Li-Ma statistical significance of 5.1σ, and is centered at R.A.=146.7∘, Dec.=43.2∘. The position of the hotspot is about 19∘ off of the supergalactic plane. The probability of a cluster of events of 5.1σ significance, appearing by chance in an isotropic cosmic-ray sky, is estimated to be 3.7×10−4 (3.4σ).
Ključne besede: acceleration of particles, cosmic rays, large-scale structure of universe, surveys
Objavljeno v RUNG: 24.04.2020; Ogledov: 3335; Prenosov: 0
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Ќе откриваме експлозии на небото како никогаш порано
Tanja Petrushevska, 2019, intervju

Ključne besede: supernova, discoveries, Universe
Objavljeno v RUNG: 14.01.2019; Ogledov: 2811; Prenosov: 0
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Ловејќи супернови преку гравитациски леќи
Tanja Petrushevska, predavanje na tuji univerzi

Ključne besede: Universe, supernovae
Objavljeno v RUNG: 26.01.2018; Ogledov: 3367; Prenosov: 0
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Survey with gravitational telescope to measure high redshift supernova rates
Tanja Petrushevska, 2016, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: supernova rates, high-redshift universe, gravitational telescopes, galaxy clusters
Objavljeno v RUNG: 26.01.2018; Ogledov: 3662; Prenosov: 0
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