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12. The rise and fall of the nuclear transient PS16dtmTanja Petrushevska, 2023, published scientific conference contribution abstract (invited lecture) Abstract: 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.
Keywords: active galactic nuclei, tidal disruption events
Published in RUNG: 10.08.2023; Views: 871; Downloads: 3
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17. LensWatch. I. resolved HST observations and constraints on the strongly lensed type Ia supernova 2022qmx (ʺSN Zwickyʺ)Justin Pierel, N. Arendse, S. Ertl, X. Huang, L. A. Moustakas, S. Schuldt, A. J. Shajib, Y. Shu, Mateusz Bronikowski, Tanja Petrushevska, 2023, original scientific article Keywords: supernova, strong lensing, astronomy
Published in RUNG: 16.05.2023; Views: 1214; Downloads: 8
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18. Multiwavelength observations of the extraordinary accretion event AT2021lwxP. Wiseman, Y. Wang, S. Hönig, N. Castro-Segura, P. Clark, C. Frohmaier, M. D. Fulton, Giorgos Leloudas, M. D. Fulton, Tanja Petrushevska, 2023, original scientific article Keywords: accretion, accretion discs, tidal disruption events, transients, galaxies, supermassive black holesc
Published in RUNG: 15.05.2023; Views: 1192; Downloads: 3
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19. Strongly lensed supernovae at high-redshifts : Invited seminar 'Strongly lensed supernovae at high-redshifts' at NCBJ, PolandTanja Petrushevska, invited lecture at foreign university Abstract: 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. In this talk, I will present some of the past 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.
Keywords: supernovae, strong lensing
Published in RUNG: 16.03.2023; Views: 1065; Downloads: 0
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