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Analytical techniques for X-ray polarization studies of rapidly rotating neutron stars and black holes
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis AI: Astronomica, Chemica, Mathematica : 733 (Turun yliopisto, 23.05.2025)Compact stellar remnants such as neutron stars and black holes attract not only mate¬rial from their surroundings but also the close attention of astronomers. The latter is because these objects constitute unattainable ... -
Bl lac objects - view from the highest energies
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis, Ser A I: : 628 (Turun yliopisto, 16.06.2020)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 ... -
Environments of Active Galaxies
Turun yliopiston julkaisuja. Sarja AI, Chemica - Physica – Mathematica : 447 (Turun yliopisto, 10.11.2012)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 ... -
Galaxy evolution through the lens of active galactic nuclei, their host galaxies, and environments
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis. Sarja AI : 712 (Turun yliopisto, 11.06.2024)The body of research relayed in this dissertation pertains to investigating the immediate environments of Type I quasars for clues to the formation and evolution of galaxies through observations. The neighboring galaxies ... -
High-precision polarimetric, broad-band spectroscopic and temporal studies of black hole X-ray binaries
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis, Ser A I: Astronomica, Chemica, Physica, Mathematica : 652 (Turun yliopisto, 08.10.2021)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 ... -
Mass and radius constraints for neutron stars using X-ray timing, spectral, and polarization observations
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis, Ser A I: Astronomica, Chemica, Physica, Mathematica : 637 (Turun yliopisto, 11.12.2020)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 ... -
Observational studies of accreting X-ray pulsars in a broad energy range
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis, Ser A I: Astronomica, Chemica, Physica, Mathematica : 675 (Turun yliopisto, 04.11.2022)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 ... -
Particle acceleration and magnetic fields of relativistic jets through multi-wavelength analyses
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis, Ser AI: Astronomica - Chemica - Physica – Mathematica : 739 (Turun yliopisto, 23.05.2025)Relativistic jets launched by supermassive black holes (SMBH) are some of the most extreme phenomena in the Universe. They are best observed in blazars, where the jet is pointing almost directly towards us. This unique ... -
Properties of highly magnetized neutron stars from X-ray timing analysis on different time scales
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis, Ser A I: Astronomica, Chemica, Mathematica : 672 (Turun yliopisto, 26.10.2022)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: ... -
The nature and rates of failed, rare, or obscured core-collapse supernovae and nuclear transients
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis, Ser A I: Astronomica, Chemica, Physica, Mathematica : 653 (Turun yliopisto, 04.11.2021)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 ... -
Where Are the Stars of Yesteryear?: A Reflection on Astrophysical Transience
Turun yliopiston julkaisuja - Annales Universitatis Turkuensis AI: Astronomica, Chemica, Mathematica : 731 (Turun yliopisto, 24.02.2025)This thesis concerns a number of kinds of astrophysical transients, including interacting supernovae (SNe), gap transients and tidal-disruption events. There are three papers included and they address differing phenomena, ... -
X-ray bursts as a tool to constrain the equation of state of the ultra-dense matter inside neutron stars
Turun yliopiston julkaisuja. Sarja AI: Astronomica - Chemica - Physica – Mathematica : 570 (Turun yliopisto, 15.12.2017)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 ...