Hae
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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, ...
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 ...
Constraining the neutron star equation of state through mass and radius measurements
(2022-11-23)
The equation of state of cold dense matter is not well known. The models for cold dense matter can be constrained through the measurement of neutron stars, as they are the densest directly observable objects in the universe. ...
Observational study of the type IIb supernovae 2017gkk and 2019gaf
(2022-12-13)
Supernova (SN) is bright explosion of a star at the end point of stellar evolution.
Supernova explosions caused by gravitational collapse of the core of the star are
called core-collapse supernovae (CCSNe), which can be ...
UV and Optical Properties of 27 Tidal Disruption Events and Nuclear Transients
(2023-08-21)
I explore the UV/optical properties of 27 tidal disruption events (TDEs), TDE candidates and nuclear transients. Given their dependence on black holes, TDEs are expected to be able to probe quantities such as black hole ...
Exploring the Cosmic History of Star Formation, Metallicity Evolution, and Core-Collapse Supernova Rates
(2023-04-11)
Research on star formation is essential for understanding galaxy evolution and the universe’s evolution. Astronomers can learn about star formation over time by observing core-collapse supernovae and determining their ...