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12. Supernovae seen through gravitational telescopesTanja Petrushevska, 2017, doktorska disertacija Opis: Gravitational lenses such as galaxies and galaxy clusters, can magnify the flux of background galaxies. These galaxies at high redshift can host supernovae (SNe) which, thanks to the magnification boost due to lensing, can be observed, otherwise too faint to be detected by current telescopes. Under the right circumstances, the background galaxies may also have multiple images due to the strong lensing. Of particular interest is to detect lensed supernovae of type Ia (SNe Ia), because of their standard brightness. They could help improve lensing models and, if multiple images are observed, the Hubble constant can be measured independently.
In this thesis, we use galaxy clusters as gravitational telescopes to search for lensed SNe at high redshift. We performed ground-based, near-infrared and optical search campaigns towards the massive clusters Abell 1689 and 370, which are among the most powerful gravitational telescopes known. Our search resulted in the discovery of five photometrically classified, core- collapse SNe at redshifts of 0.671 < z < 1.703 with significant magnification from the cluster. Owing to the power of the lensing cluster, we calculated the volumetric core-collapse SN rates for 0.4 z < 2.9, and find good agreement with previous estimates and predictions from cosmic star formation history. During our survey, we also discovered two SNe Ia in A1689 cluster members, which allowed us to determine the cluster Ia rate. Furthermore, we discuss the expectations of finding lensed SNe at high redshift in simulated search campaigns that can be conducted with upcoming ground- and space-based telescopes.
Magnification from a galaxy lens also allows for detailed studies of the SN properties at high redshift that otherwise would not be possible. Spec- troscopic observations of lensed high-redshift SNe Ia are of particular interest since they can be used to test for evolution of the standard candle nature of these objects. However, if systematic redshift-dependent properties are found, their utility for future surveys could be challenged. We investigate whether the properties of the strongly lensed and very distant SN Ia PS1- 10afx at z = 1.4, deviates from the well-studied nearby and intermediate populations of normal SNe Ia. In other study, we report the discovery of the first resolved multiply-imaged gravitationally lensed SN Ia. Ključne besede: supernovae, gravitational telescopes, galaxy clusters, lensed supernovae, strong lensing, astronomical surveys and telescopes Objavljeno v RUNG: 23.01.2018; Ogledov: 3855; Prenosov: 0 Gradivo ima več datotek! Več... |
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14. Construction of a Medium-Sized Schwarzschild-Couder Telescope for the Cherenkov Telescope Array: Implementation of the Cherenkov-Camera Data Acquisition SystemM. Santander, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Ključne besede: Cherenkov Telescope Array (CTA), double-mirror Schwarzschild-Couder medium-size telescopes
(MST-2M) for CTA, data acquisition system Objavljeno v RUNG: 02.03.2017; Ogledov: 3909; Prenosov: 197 Celotno besedilo (533,75 KB) |
15. Software design for the control system for Small-Size Telescopes with single-mirror of the Cherenkov Telescope ArrayA. Porcelli, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Ključne besede: Cherenkov Telescope Array (CTA), single-mirror Small-Size Telescopes (SST-1M) for CTA, SST-1M control system, software design Objavljeno v RUNG: 02.03.2017; Ogledov: 4032; Prenosov: 177 Celotno besedilo (666,06 KB) |
16. ROBAST: Development of a Non-Sequential Ray-Tracing Simulation Library and its Applications in the Cherenkov Telescope ArrayAkira Okumura, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Ključne besede: Cherenkov Telescope Array (CTA), simulation of optical systems of CTA telescopes, ROBAST: a Non-Sequential Ray-Tracing Simulation Library Objavljeno v RUNG: 16.02.2017; Ogledov: 3973; Prenosov: 250 Celotno besedilo (4,32 MB) |
17. Layout design studies for medium-sized telescopes within the Cherenkov Telescope ArrayT. Hassan, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Ključne besede: Cherenkov Telescope Array (CTA), medium-sized telescopes (MST) CTA sub-array, MST layout design studies, Monte Carlo performance studies Objavljeno v RUNG: 16.02.2017; Ogledov: 3836; Prenosov: 234 Celotno besedilo (1,59 MB) |
18. The Camera Calibration Strategy of the Cherenkov Telescope ArrayM. K. Daniel, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Ključne besede: Cherenkov Telescope Array (CTA), Cherenkov light intensity, calibration of cameras of CTA telescopes Objavljeno v RUNG: 24.01.2017; Ogledov: 3864; Prenosov: 238 Celotno besedilo (202,93 KB) |
19. Calibration of the Cherenkov Telescope ArrayMarkus Gaug, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Ključne besede: Cherenkov Telescope Array (CTA), calibration of cameras of CTA telescopes, atmospheric calibration Objavljeno v RUNG: 24.01.2017; Ogledov: 3722; Prenosov: 237 Celotno besedilo (184,17 KB) |
20. Performance of Silicon Photomultipliers for the Dual-Mirror Medium-Sized Telescopes of the Cherenkov Telescope ArrayJonathan Biteau, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Ključne besede: Cherenkov Telescope Array (CTA), Dual-Mirror Medium-Sized Telescopes (MST-2M) for CTA, Silicon Photomultipliers (SiPM) Camera Objavljeno v RUNG: 16.01.2017; Ogledov: 4013; Prenosov: 236 Celotno besedilo (311,70 KB) |