Sökning: "NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik"

Visar resultat 11 - 15 av 19 avhandlingar innehållade orden NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik.

1. 11. Thermal components in the early X-ray afterglow of gamma-ray bursts

   Författare :Vlasta Valan; Josefin Larsson; Yvonne Becherini; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Physics;

   Sammanfattning : Gamma-ray bursts (GRBs) are still puzzling scientists even 40 years after their discovery. Questions concerning the nature of the progenitors, the connection with supernovae and the origin of the high-energy emission are still lacking clear answers. Today, it is known that there are two populations of GRBs: short and long. LÄS MER

3. 12. Multi-messenger emission from gamma-ray bursts

   Författare :Filip Samuelsson; Felix Ryde; Peter Mészáros; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; astrophysics; gamma-ray bursts; cosmic rays; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

   Sammanfattning : Multi-messenger astronomy is a very hot topic in the astrophysical community. A messenger is something that carries information. Different astrophysical messenger types are photons, cosmic rays, neutrinos, and gravitational waves. They all carry unique and complementary information to one another. LÄS MER

4. 13. The Pulsar and Nebula in SNR 0540-69.3

   Författare :Linda Tenhu; Josefin Larsson; Göran Olofsson; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

   Sammanfattning : Supernova remnants (SNRs) are the end products of supernova (SN) explosions. These explosions happen when certain massive stars face the ends of their evolutionary cycle and create shock waves propagating in the surrounding medium by ejecting part of the star’s material. An SNR is the region defined by these powerful shocks. LÄS MER

5. 14. Cosmic rays and shock physics in gamma-ray bursts

   Författare :Filip Samuelsson; Felix Ryde; Robert Mochkovitch; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; astrophysics; gamma-ray bursts; cosmic rays; radiation-mediated shocks; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

   Sammanfattning : Gamma-ray bursts (GRBs) are the most luminous events in the known universe. Due to their tremendous energy output, they serve as laboratories of physics far beyond anything that we can hope to achieve in terrestrial experiments. LÄS MER

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

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

   Sammanfattning : 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. LÄS MER