Search for dissertations about: "x ray astronomy"

Showing result 1 - 5 of 18 swedish dissertations containing the words x ray astronomy.

2. 1. X-ray variability in Galactic high-mass black hole binaries

   Author : Magnus Axelsson; Stefan Larsson; Chris Done; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Accretion; high-energy astrophysics; temporal variability; X-ray binaries; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; astronomi;

   Abstract : The stars of the night sky can to the naked eye appear to be steady and unchanging, apart from the twinkling created by air moving in the atmosphere. However, when viewed in X-rays, the sky is far from constant, with detectable changes occurring on very short timescales.Black hole X-ray binaries are strong sources of X-rays. READ MORE

4. 2. X-ray emission from supernova shock waves

   Author : Tanja Nymark; Claes Fransson; Cecilia Kozma; Jacco Vink; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; astronomi;

   Abstract : A theoretical study of the interaction between supernovae and their surroundings is presented.Supernovae are the endpoint of the life of massive stars, and are the dominant contributors to the chemical evolution of the Universe. During its life a massive star greatly modifies its environment. READ MORE

5. 3. Interpretation of gamma-ray burst X-ray and optical afterglow emission : From the central engine to the circumburst interaction

   Author : Liang Li; Felix Ryde; Fawad Hassan; Kim Page; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; gamma-ray bursts; central engine; afterglow; teoretisk fysik; Theoretical Physics;

   Abstract : Gamma-ray bursts are the largest electromagnetic explosions known to happen in the Universe and are associated with the collapse of stellar progenitors into blackholes. After an energetic prompt emission phase, lasting typically less than a minute and emitted in the gamma-rays, a long-lived afterglow phase starts. READ MORE

6. 4. Jet-Ejecta Interactions in Neutron Star Mergers : How jets interacting with the surroundings affect multi-wavelength observations

   Author : Lorenzo Nativi; Stephan Rosswog; Miguel Aloy; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; hydrodynamics; relativistic processes; jets; gamma-ray bursts; neutron star mergers; macronova; Astronomy; astronomi;

   Abstract : In August 2017 a gravitational wave signal from a binary neutron star merger was detected for the first time, and it was followed by several electromagnetic detections that spanned the whole electromagnetic spectrum. Those observations proved the ejection of two dynamical components: mildly-relativistic neutron rich ejecta and an ultra-relativistic jet. READ MORE

7. 5. An X-Ray View of Core-collapse Supernovae

   Author : Dennis Alp; Josefin Larsson; Jacco Vink; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

   Abstract : A core-collapse supernova (CCSN) is an astronomical explosion that indicates the death of a massive star. From observations, it is clear that a large fraction of all massive stars undergoes supernova (SN) explosions, but describing how SNe explode has remained a challenge for many decades. READ MORE