Sökning: "Galactic Discs"

Hittade 5 uppsatser innehållade orden Galactic Discs.

  1. 1. The tangled Warp of the Milky Way

    Master-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionen

    Författare :Viktor Hrannar Jónsson; [2023]
    Nyckelord :Galaxy: structure; Galaxy: kinematics and dynamics; Galaxy: disk; Galaxy: evolution; Physics and Astronomy;

    Sammanfattning : Context: The Milky Way disc, like the discs of many other spiral galaxies, has been shown to be warped. The growing astrometric data set for stars produced by the Gaia mission allows for more detailed studies of the stellar disc's warp. LÄS MER

  3. 2. Investigating Gas Turbulence in Galactic Discs

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Timmy Ejdetjärn; [2019]
    Nyckelord :galaxies; gas; turbulence; interstellar medium; star formation; feedback; gravitational instability; local; high redshift; Physics and Astronomy;

    Sammanfattning : The interstellar medium of both local and distant disc galaxies is observed to be supersonically turbulent and the turbulent motion of the gas is thought to be important for galaxy formation and evolution, particularly as a key ingredient for star formation. Consequently, this generates a striking relation between the star formation rate (SFR) and gas velocity dispersion ($\sigma_{\rm g}$; a measurement on the level of turbulence). LÄS MER

  4. 3. Potassium in the Galactic thin and thick discs

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Carina Norregaard; [2018]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : To understand the evolution of our galaxy, the chemical abundance patterns and trends within the stars of the different regions are explored. The process of synthesizing these elements reveals key details about the way the stars and, therefore, the galaxy formed. LÄS MER

  5. 4. Radial migration of stars, measured in N-body simulations

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Författare :Daniel Mikkola; [2017]
    Nyckelord :N-body; simulations; galaxies; radial migration; stars; Physics and Astronomy;

    Sammanfattning : The purpose of Galactic archaeology is determining the history of the Milky Way (MW) Galaxy. To do this one uses observational data from stellar populations in terms of properties such as kinematics, chemistry, ages, and evolution. LÄS MER

  7. 5. An abundance study of the transition beetween the galactic thick and thin disc

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Johan Sandell; [2009]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Detailed abundance analysis of 41 F and G type dwarf stars located in the solar neighborhood are presented. The stellar sample was selected to have kinematics intermediate between the Galactic thin and thick discs. The stars have been observed with the NOT telescope at La Palma, Spain in March 2006 and the ESO 2. LÄS MER