Sökning: " quasars: absorption lines"
Hittade 5 avhandlingar innehållade orden quasars: absorption lines.
1. 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
2. Interferometric observations of H -absorbing gas in active galaxies
Sammanfattning : .... LÄS MER
3. Observations and astrophysical modelling of the interstellar medium
Sammanfattning : .... LÄS MER
4. A study of galaxy evolution: stacking emission lines from distant galaxies
Sammanfattning : To draw up a thorough description of galaxy evolution exhaustive observations are needed, of distant but mainly of faint galaxies. Describing low mass galaxies is important to move the focus from the tip of the iceberg. LÄS MER
5. The death throes of massive stars
Sammanfattning : Massive evolved stars affect their local surroundings as they go through phases of intense mass-loss and eventually explode as supernovae, adding kinetic energy and freshly synthesised material to the interstellar medium. The circumstellar material ejected by the star affects the shape and evolution of the future supernova remnant, and how the material is incorporated into the interstellar medium. LÄS MER