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1.
New Frontiers in Black Hole Astrophysics
2017, proceedings of peer-reviewed scientific conference contributions (international and foreign conferences)

Found in: ključnih besedah
Summary of found: ...holes, active galactic nuclei, gamma ray bursts, tidal disruption events, gravitational waves...
Keywords: astronomy, black holes, active galactic nuclei, gamma ray bursts, tidal disruption events, gravitational waves
Published: 17.08.2017; Views: 1427; Downloads: 0
.pdf Fulltext (106,73 KB)

2.
Tidal disruption events from different kinds of astrophysical objects: a preliminary analysis
Aurora Clerici, Andreja Gomboc, 2017, published scientific conference contribution abstract

Found in: ključnih besedah
Keywords: astronomy, tidal disruption events, black holes
Published: 17.08.2017; Views: 1908; Downloads: 0
.pdf Fulltext (221,17 KB)

3.
Simulations of Tidal Disruption Events Observations with the LSST
Katja Bricman, 2017, master's thesis

Abstract: The Large Synoptic Survey Telescope (LSST) will produce a multi-colour survey of 25000 square deg of the Southern sky during its 10 years of operations. It will observe over 20 billion galaxies and a similar number of stars, map the Solar System and the Milky Way, and probe dark matter and dark energy. In addition, it will discover thousands of transients every night, including new classes of objects, which have not yet been observed. Due to its large coverage of the sky it will be a perfect tool for the search of rare Tidal Disruption Events (TDEs), which occur when a star passes close by a supermassive black hole and gets disrupted by its tidal force. Afterwards the stellar debris fall back to the black hole, initially at a rate exceeding the Eddington rate, producing an outflow, which releases a flare of energy. When the fallback rate subsides below the Eddington rate, the gas accretes onto the black hole via accretion disk. The LSST simulation framework enables us to simulate observations of different types of objects with the LSST. In this work, we include TDEs in the LSST simulation framework, estimate the number of detected TDEs, and simulate their light curves using a theoretical model, which predicts a t^(-2.6) light curve decline with time in the outflow phase and a t^{-0.4} decline in the disk phase. We also take a closer look at the distribution of the detected TDEs over cosmological redshift and black hole mass.
Found in: ključnih besedah
Keywords: Astronomical observations, Large Synoptic Survey Telescope, Tidal Disruption Events, Black Holes, simulations
Published: 17.10.2017; Views: 1491; Downloads: 0
.pdf Fulltext (8,73 MB)

4.
Sifting for Sapphires: Systematic Selection of Tidal Disruption Events in iPTF
Tanja Petrushevska, 2018, original scientific article

Found in: ključnih besedah
Keywords: tidal disruption events
Published: 02.10.2018; Views: 928; Downloads: 0
.pdf Fulltext (2,11 MB)

5.
Flares from the centers of galaxies with Gaia and OGLE surveys
Nada Ihanec, 2018, master's thesis

Abstract: Modern wide-field-of-view and all-sky satellites (e.g. Gaia) and ground based surveys (e.g. OGLE) repeatedly cover a large part of the sky and are detecting new, transient astrophysical sources on daily basis. In this thesis I analyzed the data from Gaia and OGLE transient surveys, with special focus on transients located near the centres of galaxies to detect possible Tidal Disruption Events. These occur when a star gets too close to a Super-Massive Black Hole, which lurks in the centres of most galaxies, and gets disrupted due to the black hole's gravitational tidal forces. The goal of my research was to detect possible Tidal Disruption Events and eliminate false candidates, such as supernovae. The work involved daily inspection of new alerts, identified with Gaia and OGLE Transient Detection System. I searched for potential transients in galactic nuclei and in case there was such a transient detected, follow-up spectroscopic observations were initiated in order to help classify the object. During the course of my work I analyzed spectra obtained with the largest telescopes in the world (SALT, VLT) and performed the spectral template matching, recognition of spectral features related to known classes of transients, determination of redshift etc.
Found in: ključnih besedah
Summary of found: ...the centres of galaxies to detect possible Tidal Disruption Events. These occur when a star...
Keywords: Flares, transients, Gaia, OGLE, supernovae, tidal disruption events, nuclear transients
Published: 14.05.2019; Views: 1117; Downloads: 48
.pdf Fulltext (8,11 MB)

6.
TDEs with LSST
Katja Bricman, 2018, published scientific conference contribution abstract

Abstract: The Large Synoptic Survey Telescope (LSST) is an upcoming ground-based survey telescope in Chile, which will produce a multi-color survey of 18000 square degrees of the Southern Sky during its 10 years of observations. Due to its large coverage of the sky and its observing strategy it will be a perfect tool in search for transient astrophysical events, including rare Tidal Disruption Events (TDEs). TDEs occur when a star passes close by a supermassive black hole (SMBH) in a center of a galaxy and gets disrupted by its tidal forces. These events emit a bright flare of light, which can be observed to cosmological distances. In the seminar I will provide an overview of the LSST and TDEs, and present the preliminary results on the estimated absolute rates of TDE detection in 10 years of LSST operations, which were obtained by simulations of TDE light curves with an end-to-end LSST simulations framework.
Found in: ključnih besedah
Summary of found: ...search for transient astrophysical events, including rare Tidal Disruption Events (TDEs). TDEs occur when a...
Keywords: Tidal Disruption Events, Supermassive Black Holes, Sky Surveys
Published: 04.01.2021; Views: 39; Downloads: 2
.pdf Fulltext (1009,99 KB)

7.
The prospects of observing Tidal Disruption Events with the Large Synoptic Survey Telescope (LSST)
Andreja Gomboc, Katja Bricman, 2018, published scientific conference contribution abstract

Found in: ključnih besedah
Keywords: Tidal disruption events, sky surveys
Published: 04.01.2021; Views: 32; Downloads: 0
.docx Fulltext (548,11 KB)

8.
Studying TDEs in the era of LSST
Katja Bricman, Andreja Gomboc, 2019, published scientific conference contribution abstract

Found in: ključnih besedah
Summary of found: ...in search of rare transients, such as Tidal Disruption Events (TDEs). Bright optical flares resulting...
Keywords: 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).
Published: 04.01.2021; Views: 31; Downloads: 0

9.
Studying TDEs in the era of LSST
Katja Bricman, Andreja Gomboc, 2019, published scientific conference contribution abstract

Abstract: 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.
Found in: ključnih besedah
Summary of found: ...in search of rare transients, such as Tidal Disruption Events (TDEs). Bright optical flares resulting...
Keywords: Tidal Disruption Events, sky surveys
Published: 04.01.2021; Views: 34; Downloads: 4

10.
Observing TDEs in the era of LSST
Katja Bricman, 2019, published scientific conference contribution abstract

Abstract: The upcoming Large Synoptic Survey Telescope (LSST) will observe ~18000 square degrees of the Southern sky and is expected to discover thousands of transients every night due to its large coverage of the sky and its observing strategy. Being an exceptional transient hunter, we expect the LSST to increase the current observed sample of Tidal Disruption Events (TDEs) by a factor of ~1000 in 10 years of survey duration. TDEs are one of the only probes of dormant supermassive black holes in the Universe, and if their observed optical light curves are sampled frequently enough, TDEs can serve as indicators of SMBH mass. In this talk I will present our simulations of TDE observations with LSST, the resulting SMBH mass distributions of observed TDEs, and the efficiency of different proposed observing strategies of LSST in finding these rare transients.
Found in: ključnih besedah
Summary of found: ...to increase the current observed sample of Tidal Disruption Events (TDEs) by a factor of...
Keywords: Tidal Disruption Events, sky surveys
Published: 04.01.2021; Views: 25; Downloads: 2
.pdf Fulltext (15,43 MB)

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