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91.
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: 2531; Prenosov: 0

92.
The prospects of observing Tidal Disruption Events with the Large Synoptic Survey Telescope (LSST)
Katja Bricman, Andreja Gomboc, 2018, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: Tidal disruption events, sky surveys
Objavljeno v RUNG: 04.01.2021; Ogledov: 2294; Prenosov: 0
Gradivo ima več datotek! Več...

93.
Studying TDEs in the era of LSST
Katja Bricman, Andreja Gomboc, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: 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.
Ključne besede: Tidal Disruption Events, sky surveys
Objavljeno v RUNG: 04.01.2021; Ogledov: 2461; Prenosov: 78
URL Povezava na datoteko
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94.
Meje našega sveta
Andreja Gomboc, 2020, poljudni članek

Ključne besede: vesolje, covid, znanost
Objavljeno v RUNG: 10.12.2020; Ogledov: 2243; Prenosov: 14
URL Povezava na datoteko

95.
Observational constraints on the optical and near-infrared emission from the neutron star-black hole binary merger candidate S190814bv
Andreja Gomboc, 2020, izvirni znanstveni članek

Ključne besede: astrofizika, nevtronske zvezde, gravitacijski valovi
Objavljeno v RUNG: 27.11.2020; Ogledov: 2687; Prenosov: 0
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96.
Ženske: Stoletje in leto sprememb
Andreja Gomboc, 2020, poljudni članek

Ključne besede: enakost, pravice žensk, raziskovalci
Objavljeno v RUNG: 12.11.2020; Ogledov: 2218; Prenosov: 0
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97.
A study on tidal disruption event dynamics around an Sgr A*-like massive black hole
Aurora Clerici, Andreja Gomboc, 2020, izvirni znanstveni članek

Ključne besede: astronomija, črne luknje, plimsko raztrganje zvezd
Objavljeno v RUNG: 05.11.2020; Ogledov: 2827; Prenosov: 0
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98.
Ko šteje vsaka beseda
Andreja Gomboc, 2020, poljudni članek

Ključne besede: astronomija, Nobelova nagrada, črne luknje, Venera
Objavljeno v RUNG: 17.10.2020; Ogledov: 2493; Prenosov: 0
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99.
A study of stellar debris dynamics during a tidal disruption event
Aurora Clerici, 2020, doktorska disertacija

Opis: The number of observed tidal disruption events is increasing rapidly with the advent of new surveys. Thus, it is becoming increasingly important to improve TDE models using different stellar and orbital parameters. We study the dynamical behaviour of tidal disruption events produced by a massive black hole like Sgr A* by changing different initial orbital parameters, taking into account the observed orbits of S stars. Investigating different types of orbits and penetration factors is important since their variations lead to different timescales of the tidal disruption event debris dynamics, making mechanisms such as self-crossing and pancaking act strongly or weakly, thus affecting the circularisation and accretion disk formation. We have performed smoothed particle hydrodynamics simulations. Each simulation consists in modelling the star with $10^5$ particles, and the density profile is described by a polytrope with $\gamma$ = 5/3. The massive black hole is modelled with a generalised post-Newtonian potential, which takes into account relativistic effects of the Schwarzschild space-time. Our analyses find that mass return rate distributions of solar-like stars and S-like stars with same eccentricity have similar durations, but S-like stars have higher mass return rate, as expected due to their larger mass. Regarding debris circularisation, we identify four types of evolution, related to the mechanisms and processes involved during circularisation: in type 1 the debris does not circularise efficiently, hence a disk is not formed or is formed after relatively long time; in type 2 the debris slowly circularises and eventually forms a disk with no debris falling back; in type 3 the debris relatively quickly circularises and forms a disk while there is still debris falling back; finally, in type 4 the debris quickly and efficiently circularises, mainly through self-crossings and shocks, and forms a disk with no debris falling back. Finally, we find that the standard relation of circularisation radius $r_{\rm circ} = 2r_{\rm t}$ holds only for $\beta = 1$ and eccentricities close to parabolic.
Ključne besede: 07.05.Tp Computer modeling and simulation, 95.30.Lz Hydrodynamics, 98.35.Jk Galactic center, bar, circumnuclear matter, and bulge, 98.62.Js Galactic nuclei (including black holes), circumnuclear matter, and bulges, 98.62.Mw Infall, accretion, and accretion disks
Objavljeno v RUNG: 29.09.2020; Ogledov: 3508; Prenosov: 77
.pdf Celotno besedilo (37,55 MB)

100.
Svet ni črno-bel
Andreja Gomboc, 2020, strokovni članek

Ključne besede: zvezde, galaksije, teleskopi
Objavljeno v RUNG: 18.09.2020; Ogledov: 2181; Prenosov: 0
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