Hae
Aineistot 21-30 / 42
Magnetospheric truncation of an accretion disk around the unique X-ray pulsar GRO J1744-28
(Turun yliopisto, 2017-09-18)
Neutron stars are very massive yet compact objects, where both quantum mechanical and relativistic effects play a role. Many of them have magnetic fields which are many orders of magnitude stronger than what mankind can ...
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 ...
Spectroscopic Studies of Fermi LAT Blazars
(Turun yliopisto, 2016-06-15)
Blazar research offers a view to one of the most energetic physical processes known
to man. The high-energy end of blazar emission has been probed by the Fermi
satellite mission since 2008, and it has catalogued more ...
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 ...
Avoimen tähtijoukon M44:n tähtien fotometrinen seuranta eksoplaneetan ylikulun havaitsemiseen käyttämällä Tuorlan 70 cm:n kaukoputkea
(Turun yliopisto, 2016-11-02)
Tutkielmaa varten seurattiin avointa tähtijoukkoa M44. Joidenkin tähtien valokäyrän aikamuutoksia havaittiin fotometrisesti mahdollisien ylikulkujen aikana kuvaamalla tähtiä Tuorlan 70 cm:n kaukoputkella valkoisessa valossa. ...
Optisen polarisaation ja gammavuovaihteluiden vertailu blasaarisuihkuissa
(Turun yliopisto, 2017-05-16)
Tutkielma käsittelee aktiivisten galaksiytimien erikoistapausta blasaareja ja kuinka niiden ominaisuuksia tutkitaan tarkkailemalla niistä lähtevän optisen säteilyn polarisaatiota vertaamalla sitä samanaikaiseen korkeaenergiseen ...
Long-term optical monitoring of Blazars
(Turun yliopisto, 2017-01-02)
Blazars are a polarized, extremely variable and highly energetic Active Galactic Nuclei which are assumed to be powered by a central black hole. The study of their multi-wavelength spectra has provided significant information ...
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 ...
Mass and radius constraints for neutron stars from pulse shape modeling
(2016-11)
Neutron stars are the most compact directly observable objects. The matter inside a neutron star is at supranuclear densities. The equation of state (EOS) of neutron stars describes the properties of such dense matter. ...