Hae
Aineistot 1-10 / 14
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 ...
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 ...
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 ...
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 ...
X-ray bursts as a tool to constrain the equation of state of the ultra-dense matter inside neutron stars
(Turun yliopisto, 2017-12-15)
Neutron stars are one of the most dense objects in the Universe. However, the exact description of the equation of state (EoS) of the cold ultra-dense matter inside them is still a mystery. In this thesis, we measure the ...
Very High Energy Gamma-Rays emitting BL LAC's Population Study
(Turun yliopisto, 2014-09-16)
Context: BL Lacs are the most numerous extragalactic objects which are detected in Very High Energy (VHE) gamma-rays band. They are a subclass of blazars. Large flux variability amplitude, sometimes happens in very short ...
Symplektisen integroinnin soveltaminen satelliittien suhteellisten ratojen laskemiseen
(Turun yliopisto, 2009-10-07)
Maapalloa kiertävien satelliittien liikkeet toistensa suhteen eli
satelliittien suhteelliset radat ovat keskeisessä asemassa satelliittimuodostelmien kannalta. Suhteellisten ratojen ratkaiseminen maapallon potentiaalikentässä ...
Environments of Active Galaxies
(Turun yliopistoAnnales Universitatis Turkuensis A I 447, 2012-11-10)
This dissertation presents studies on the environments of active galaxies.
Paper I is a case study of a cluster of galaxies containing BL Lac object RGB
1745+398. We measured the velocity dispersion, mass, and richness ...
Globular Cluster Bimodality in Isolated Elliptical Galaxies
(Turun yliopisto, 2013-06-05)