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Aineistot 1-10 / 19
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: ...
Observational studies of accreting X-ray pulsars in a broad energy range
(Turun yliopisto, 2022-11-04)
Among all interesting astrophysical objects in the universe, only a few are capable of improving our understanding of physics under extreme conditions. Accreting neutronstars are one of these objects. These compact objects ...
Spectral properties of accreting millisecond pulsars obtained with the Comptonization model COMPPS
(2022-04-27)
The neutron stars are unique objects to study properties of matter under extreme conditions. In fact, they are as dense as nuclear nuclei, at the same time they possess the highest magnetic fields in the Universe. Accreting ...
Long-term light-curves of transient X-ray pulsars as a tool to study disk−magnetosphere interaction
(2022-06-15)
X-ray pulsars are highly magnetized neutron stars in close binary systems accreting matter from a normal companion star. Their strong magnetic fields channel the accreting matter onto the magnetic poles of the neutron star, ...
The nature and rates of failed, rare, or obscured core-collapse supernovae and nuclear transients
(Turun yliopisto, 2021-11-04)
In this thesis, two major types of astrophysical phenomena are discussed: corecollapse supernovae and transient events associated with supermassive black holes in the nuclei of galaxies. The physical processes and observable ...
High-precision polarimetric, broad-band spectroscopic and temporal studies of black hole X-ray binaries
(Turun yliopisto, 2021-10-08)
Black holes are among the most unusual objects in the Universe. Powered through accretion, they are strong sources of radiation in a broad energy range, from radio to hard X-rays. Stellar-mass black holes manifest themselves ...
Simulations of Wave Propagation and Wave–wave Interactions in the Solar Corona and Solar Wind
(2021-06-17)
Several numerical methods, notably upwind schemes, Lax–Wendroff schemes, and a semi-Lagrangian scheme, are investigated in order to find suitable models to simulate Alfvén wave transport and evolution. The tools are assessed ...
Kvasaarien joukkoympäristöt
(2021-08-04)
Tutkimuksissa analysoitiin kvasaarien lähiympäristöjen, joukkojen ja niiden galaksien ominaisuuksien välisiä korrelaatioita Sloan Digital Sky Surveyn (SDSS-IV, DR12, DR14Q) fotometrisen ja spektroskooppisen datan pohjalta. ...
Solar Energetic Particles and their Measurement with Space Borne Instruments
(2021-07-07)
The study of our Sun and its various modes of activity is an important area of research in the field of space physics and heliophysics. These active phenomena such as solar flares and Coronal Mass Ejections are associated ...
Galaxy flows in cosmic filaments
(2021-07-21)
In the universe galaxies are assembled into the cosmic web, consisting of voids, walls, galaxy clusters and filaments. Filaments are elongated matter flows connecting the clusters together. Because of the non-uniform matter ...