Sökning: "Merger History"

Visar resultat 1 - 5 av 24 uppsatser innehållade orden Merger History.

  1. 1. The quest for a classical bulge - a study of kinematics, abundances, and ages using microlensed dwarf stars and Gaia

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

    Författare :Calum Kvernes Macpherson; [2023]
    Nyckelord :Bulge; Milky Way; Kinematics; Galpy; Dwarf Stars; Physics and Astronomy;

    Sammanfattning : Context: We present an kinematical analysis of 90 F and G type dwarf, turn-off, and subgiant stars in the Galactic bulge. These stars were observed with high-resolution spectrographs during gravitational microlensing events This allowed for their ages, abundances, and radial velocities to be ascertained while they were significantly brighter. LÄS MER

  3. 2. The chemical evolution of the Milky Way: pushing APOGEE to higher precision and accuracy

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

    Författare :Erik Fridén; [2023]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : In the recent decade, a rapid increase in all-sky spectroscopic surveys has occurred, and with it, the wealth of observational data and information on our Galaxy. Consequently, numerous detections of new structures, such as new open clusters, accreted and in-situ components, are discovered. LÄS MER

  4. 3. Sammanslagningen av Autism och Aspergers syndrom till Autismspektrumsyndrom i DSM-5 : När individer oväntat fått diagnosen och andra inte får någon diagnos alls.

    Master-uppsats, Linnéuniversitetet/Institutionen för psykologi (PSY)

    Författare :Johan Lindh; [2023]
    Nyckelord :;

    Sammanfattning : Bakgrund: I DSM-5 (2013) kombinerades de två diagnoserna ’Asperger’s syndrome’ och ’Autistic Disorder’, bland andra, till ’Autismspektrumtillstånd’ (AST) tillsammans med högre kriterier för att uppnå diagnosen. Denna uppsats är avsedd att undersöka utkomsten av denna förändring och dess konsekvenser för dess mottagare av diagnoserna tio år senare i en Svensk vårdkontext och vanliga uppfattningar om diagnosen. LÄS MER

  5. 4. Can Dwarf Galaxies Tell Us How the Milky Way Formed?

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

    Författare :Þóra Karlsdóttir; [2023]
    Nyckelord :Dwarf Galaxy; Milky Way; Physics and Astronomy;

    Sammanfattning : Dwarf galaxies are a key component in understanding the evolution of galaxies and provide tests on the standard cosmological $\Lambda$ Cold Dark Matter model. According to the formation hierarchy, dwarf galaxies are the pieces that create all galaxies. Our current understanding of dwarf galaxies faces discrepancies between theory and observations. LÄS MER

  7. 5. Colliding Galaxies in a (Nut)Shell

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Fysiska institutionen

    Författare :Jonathan Petersson; [2022]
    Nyckelord :shell galaxies; simulations; starbursts; quenching; mergers; Physics and Astronomy;

    Sammanfattning : Galaxy interactions and mergers are natural recurring events in the current cosmological paradigm, events that often coincide with starbursts and enhanced star formation activity. To understand why that is, one can use idealised (non-cosmological) merger simulations, which provide freedom to recreate specific tidally distorted galaxies, and analysis of the time evolution and underlying physics of the star formation activity at a high spatial resolution. LÄS MER