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1.
Hevreka (Supernove tipa 1a)
Tanja Petrushevska, Japelj Jure, radijska ali televizijska oddaja, podkast, intervju, novinarska konferenca

Opis: V vesolju tudi poka kot za stavo. Zvezde, ki večino življenja ne počnejo nič drugega kot spreminjajo vodik v helij, si včasih zaželijo pozornosti in eksplodirajo kot supernove. Zvezda kar naenkrat postana svetlejša od celotne galaksije, zato supernove vidimo tudi, ko eksplodirajo daleč, daleč stran. Astronomi vesoljski ognjemet seveda z veseljem opazujejo. Supernove namreč niso zgolj izjemno svetle, ampak igrajo pomembno vlogo pri številnih procesih v vesolju. Kozmične eksplozije so različnih tipov in okusov, verjetno najbolj slavne med njimi pa so supernove tipa 1a. Te nam je približala doktorica Tanja Petrushevska, docentka na Fakulteti za naravoslovje Univerze v Novi Gorici. Pred mikrofon jo je povabil dr. Jure Japelj.
Ključne besede: radio, intervju, supernova
Objavljeno v RUNG: 24.11.2023; Ogledov: 456; Prenosov: 1
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What can we do with strongly lensed supernovae?
Tanja Petrushevska, 2023, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: cosmology, strong lensing, supernovae
Objavljeno v RUNG: 07.09.2023; Ogledov: 642; Prenosov: 3
.pdf Celotno besedilo (18,56 MB)

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Contributed talk at the international conference "Cosmology in Miramare" 2023
Tanja Petrushevska, 2023, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: The searches and observations of supernovae (SNe) have been motivated by the fact that they are exceptionally useful for various astrophysical and cosmological applications. Most prominently, Type Ia SNe (SNe Ia) have been used as distance indicators showing that the expansion rate of the Universe is accelerating. The strong gravitational lensing effect provides another powerful tool and occurs when a foreground mass distribution is located along the line of sight to a background source. It can happen so that galaxies and galaxy clusters can act as “gravitational telescopes”, boosting the faint signals from distant SNe and galaxies. Thanks to the magnification boost provided by the gravitational telescope, we are able to probe galaxies and SNe that otherwise would be undetectable. Therefore, the combination of the two tools, SNe and strong lensing, in the single phenomenon of strongly lensed SNe, provides a powerful simultaneous probe of several cosmological and astrophysical phenomena. By measuring the time delays of strongly lensed supernovae and having a high-quality strong lensing model of the galaxy cluster, it is possible to measure the Hubble constant with competitive precision. In this talk, I will present some of the past and recent results that have been possible due to the observations of strongly lensed supernovae and anticipate what we can expect in the future from the upcoming telescope surveys, such as the Vera C. Rubin Observatory and Nancy G. Roman Space Telescope.
Ključne besede: cosmology, supernovae, strong lensing
Objavljeno v RUNG: 07.09.2023; Ogledov: 675; Prenosov: 2
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6.
Strong lensing as a tool to study the early universe : written report
Brankica Apostolova, 2023, raz. nal. na višji ali visoki šoli

Ključne besede: strong lensing, astrophysics, Roman Space Telescope, galaxy clustersv, galaxies
Objavljeno v RUNG: 23.08.2023; Ogledov: 635; Prenosov: 0
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The rise and fall of the nuclear transient PS16dtm
Tanja Petrushevska, 2023, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Opis: Thanks to the advent of large-scale optical surveys, a diverse set of flares from the nuclear regions of galaxies has recently been discovered. These include the disruption of stars by supermassive black holes at the centres of galaxies - nuclear transients known as tidal disruption events (TDEs). Active galactic nuclei (AGN) can show extreme changes in the brightness and emission line intensities, often referred to as changing-look AGN (CLAGN). Given the physical and observational similarities, the interpretation and distinction of nuclear transients as CLAGN or TDEs remains difficult. One of the obstacles of making progress in the field is the lack of well-sampled data of long-lived nuclear outbursts in AGN. I will present PS16dtm, a nuclear transient in a Narrow Line Seyfert 1 (NLSy1) galaxy which has been proposed to be a TDE candidate. I will show our multi-year spectroscopic and photometric study of PS16dtm, which can help us to better understand the outbursts originating in NLSy1 galaxies.
Ključne besede: active galactic nuclei, tidal disruption events
Objavljeno v RUNG: 10.08.2023; Ogledov: 751; Prenosov: 3
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Contributed talk at the European Astronomical Society Annual Meeting 2023 : The rise and fall of the iron-rich nuclear transient PS16dtm
Tanja Petrushevska, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: nuclear transients, photometry, spectroscopy, EAS
Objavljeno v RUNG: 19.07.2023; Ogledov: 710; Prenosov: 2
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Merjenje vesolja (Ugriznimo znanost RTC SLO)
Tanja Petrushevska, radijska ali televizijska oddaja, podkast, intervju, novinarska konferenca

Ključne besede: Merjenje vesolja Ugriznimo znanost
Objavljeno v RUNG: 12.06.2023; Ogledov: 762; Prenosov: 3
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Astronomi odkrili največjo kozmično eksplozijo (RTV SLO 1)
Tanja Petrushevska, radijski ali tv dogodek

Ključne besede: Intervju
Objavljeno v RUNG: 12.06.2023; Ogledov: 815; Prenosov: 0
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