Sökning: "star formation history"

Visar resultat 1 - 5 av 23 avhandlingar innehållade orden star formation history.

1. 1. Molecular gas and ionizing radiation in star-forming galaxies

   Författare :Johannes Puschnig; Matthew Hayes; Göran Östlin; Amélie Saintonge; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; astrophysics; galaxies; star formation; starburst; interstellar medium; Lyman continuum; Lyman alpha; reionization; gravitational instability; molecular gas; clump formation; Astronomy; astronomi;

   Sammanfattning : In cosmic history, some of the major changes such as reionization were driven by baryons (i.e. the stars and gas in galaxies), despite the fact that they contribute only few percent to the total mass-energy budget in the Universe. LÄS MER

3. 2. Star clusters as engines of galaxy evolution

   Författare :Mattia Sirressi; Angela Adamo; Matthew Hayes; Paul Crowther; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Extragalactic astronomy; Galaxies; Star formation; Interstellar medium; Stellar feedback; Ultraviolet surveys; Hubble Space Telescope; Spectroscopy; Data analysis; Astronomy; astronomi;

   Sammanfattning : Feedback in star forming galaxies is the key process that regulates how many stars form given the available gas reservoir. The radiation, energy and momentum released by the stellar activity and the active galactic nuclei change the physical properties of the gas in the galaxy such as the ionisation state, the density and the kinematics. LÄS MER

4. 3. Dreams of a subversive future : sexuality, (hetero)normativity, and queer potential in science fiction film and television

   Författare :Josefine Wälivaara; Per Ringby; Christina Svens; Stacey Abbott; Umeå universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Science fiction; film; television; genre; sexuality; queer; storytelling; gender; subversive; intelligibility; Torchwood; Firefly; Star Wars; Star Trek; adult turn; Star’verses; dramaturgy; heteronormativity; film history; Hollywood; Literature; litteraturvetenskap;

   Sammanfattning : The aim of the thesis is to explore depictions of sexuality in popular science fiction film and television through a focus on storytelling, narrative, characters and genre. The thesis analyses science fiction as a film and television genre with a focus on the conventions, interpretations, and definitions of genre as part of larger contexts. LÄS MER

5. 4. Chemodynamical Simulations of Star-Forming Molecular Clouds

   Författare :Chia-Jung Hsu; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; methods:numerical; magnetohydrodynamics; stars:formation; astrochemistry; ISM:clouds;

   Sammanfattning : Stars are known to form from dense, dusty clumps and cores of molecular clouds. However, there is no consensus on a theory that can predict the rate of star formation, its clustering, and the conditions needed for massive stars to be born. A major challenge is how to observe and characterise the gas that is the fuel for star formation. LÄS MER

7. 5. High-resolution radio imaging of galaxy nuclei

   Författare :Eskil Varenius; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arp220; star formation; NGC4418; M82;

   Sammanfattning : Star formation and galaxy evolution are intimately linked together. A detailed understanding of the environment where stars form may help us explain the differences we see between galaxies today and at earlier times in the history of the Universe. LÄS MER