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    • Bl lac objects - view from the highest energies 

      Fallah Ramazani, Vandad
      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 

      Lietzen, Heidi
      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 

      Stone, Maria Babakhanyan
      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 

      Kosenkov, Ilia
      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 

      Salmi, Tuomo
      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 

      Nabizadeh, Armin
      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 ...

    • Properties of highly magnetized neutron stars from X-ray timing analysis on different time scales 

      Mönkkönen, Juhani
      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 

      Reynolds, Thomas Michael
      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 

      Moran, Shane
      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 

      Nättilä, Joonas
      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 ...