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The Starving Ellipticals of Fossil Groups
(Turun yliopisto, 2018-09-05)
Fossil Groups (FGs) are unique galaxy systems with extensive X-ray halos and large magnitude gaps between members. It has been theorized that they are old and dynamically relaxed systems formed by multiple galaxy mergers. ...
Observational studies of supernovae and intermediate luminosity optical transients
(Turun yliopisto, 2020-04-20)
Thanks to modern all-sky surveys, thousands of astronomical transient events are discovered annually. Although many of these, such as regular supernovae (SNe), are fairly well understood, new rarer classes of transients ...
Late-time near-infrared evolution of the ejecta and the equatorial ring of Supernova 1987A
(Turun yliopisto, 2018-05-23)
Supernova 1987A, located 50 kpc away in the Large Magellanic Cloud, is the closest supernova (SN) observed in the time of modern astronomy. The circumstellar medium of SN 1987A is characterised by a system of three rings ...
Mass and radius constraints for neutron stars using X-ray timing, spectral, and polarization observations
(Turun yliopisto, 2020-12-11)
Neutron stars (NSs) are the most dense objects in the Universe that can be directly observed. The nature of the cold ultra-dense matter inside them is still unresolved, and determining the equation of state (EoS) of that ...
Constraining supernova progenitors with integral field spectroscopy
(2019-11-03)
Core-collapse supernovae (CCSNe) are an important part of the stellar evolution of massive stars. Certain types of supernova (SN) explosions are believed to originate from similar types of stars, but linking a SN type ...
Inconsequential Dense Regions and Enhanced Star Formation in Quasar Host Galaxies in the Galaxy and Mass Assembly (GAMA) Survey
(2020-01-10)
Quasars (QSOs) are the brightest objects in the known universe which radiate across the electromagnetic spectrum. They are active nuclei of galaxies that have super- massive black holes (SMBH) at their center. It is believed ...
Bl lac objects - view from the highest energies
(Turun yliopisto, 2020-06-16)
Relativistic jets launched by a super-massive black holes are among the most extreme particle accelerators in the Universe. BL Lac objects host a relativistic jet that points very close to our line of sight. They are the ...
Examining the symmetry of optical flares in blazars
(2019-05-04)
Blazars are one of the most energetic types of active galactic nuclei. They are luminous emitters that can be detected over the whole of the electromagnetic spectrum. They are radio-loud objects whose jet is closely aligned ...
A Study of Astronomical Polarization, Polarimetric Observations and Polarimetry of Exoplanets
(2020-05-15)
Astronomical polarization has become one useful tool to study a number of astronomical objects and related astrophysical mechanisms. The polarization of electromagnetic waves is caused by various astronomical phenomena. ...
Properties of highly magnetized neutron stars from X-ray timing analysis on different time scales
(Turun yliopisto, 2022-10-26)
Massive stars end their lives either by collapsing directly into a black hole or by exploding as a supernova, leaving behind their collapsed core, a black hole or a neutron star (NS). NSs are a showcase of extremities: ...