Sökning: "supernova remnants"
Visar resultat 1 - 5 av 13 avhandlingar innehållade orden supernova remnants.
1. Observations of young core collapse supernova remnants
Sammanfattning : Studies of young remnants offer an opportunity to test theoretical models of stellar evolution, explosion models and nucleosynthesis, as well as our understanding of the compact objects in the centre of the exploded stars.The first part of the thesis involves observations of the Crab nebula. LÄS MER
2. Molecules at stellar death: from the winds of massive evolved stars to supernova remnants
Sammanfattning : Massive stars play a key role in the chemical and dust budget of the galaxy, producing heavy elements, molecules, and dust. At the end of their lives they evolve through stages of significant mass-loss which affect the subsequent evolution of the star, including whether or not it will eventually explode as a supernova (SN). LÄS MER
3. Supernova remnants and their pulsar wind nebulae
Sammanfattning : Massive stars die in powerful stellar explosions, so-called supernovae. In most cases, a neutron star or a black hole is expected to form in the center. The ejected material in these explosions expands out into the surroundings for tens of thousands of years, forming a supernova remnant. If a rapidly rotating neutron star, i. LÄS MER
4. Observations and analysis of water in molecular outflows and shocks
Sammanfattning : This thesis describes observations and analysis of molecular outflows from young stellar objects. The observations using the Odin satellite are described in Paper I, where a non-LTE radiative transfer code has been used to estimate the ortho-water abundance in seven molecular outflows and one super-nova remnant. LÄS MER
5. Interstellar absorption across the electromagnetic spectrum
Sammanfattning : We report results of a multi-wavelength study of interstellar absorption in diffuse molecular clouds that lie in the direction of flat-spectrum quasars. Quasars as back-ground sources allow the measurement of Galactic interstellar absorption across the electromagnetic spectrum from mm to X-ray wavelengths. LÄS MER
