Avancerad sökning

Visar resultat 16 - 20 av 25 uppsatser som matchar ovanstående sökkriterier.

  1. 16. Efficient Discovery Of Binary Stars

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

    Författare :Pablo Navarro Barrachina; [2020]
    Nyckelord :Binary Stars; Spectroscopic binary stars; SB2; Machine Learning; Data Mining; Physics and Astronomy;

    Sammanfattning : Purpose: even in the era of exponential increase in the amount of stellar data gathered, binaries are still often overlooked in observational data due to the special handling they require. The goal of this work is to develop a method capable of automatically and efficiently identifying and extract double-lined spectroscopic binaries (SB2) from a spectroscopic survey, while being scalable and technically successful, and to identify and optimize the parameters that influence their detection. LÄS MER

  3. 17. Do variations in the initial mass function affect galaxy evolution?

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

    Författare :Mateo Prgomet; [2020]
    Nyckelord :galaxy; galaxy formation; galaxy evolution; feedback; star formation; ultra faint dwarf galaxy; initial mass function; variations; universe; redshift; hydrodynamics; cosmology; zoomed-in simulations Galaxy formation and evolution; galaxy feedback; stellar feedback; IMF variations; cosmological zoomed-in simulations; Physics and Astronomy;

    Sammanfattning : The initial mass function (IMF) describes the stellar mass distribution for a population of stars at birth. This parameter represents a topic of long standing discussion within astronomy due to its apparent insensitive nature to environmental conditions. However, in the last decade, significant evidence suggesting the contrary has been presented. LÄS MER

  4. 18. Galaxy evolution in extreme environments

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Samhitha Vadlamani; [2019]
    Nyckelord :Galaxy evolution; interactions; starburst; Compact galaxy groups; Stephan s Quintet; Physics and Astronomy;

    Sammanfattning : Interactions play a crucial role in determining how galaxies evolve in terms of their morphologies and star formation histories, since the majority of the known galaxies in the nearby Universe are found to exist in groups. Compact groups of galaxies are of particular interest as they contain a small number of galaxies in dense configurations and host repeated interactions between them, enabling us to capture signatures of these interactions (e. LÄS MER

  5. 19. Galaxy clusters and cosmic voids in modified gravity scenarios

    L3-uppsats, Uppsala universitet/Teoretisk astrofysik

    Författare :Sveva Castello; [2019]
    Nyckelord :Cosmology; galaxy clusters; cosmic voids; f R gravity;

    Sammanfattning : The so-called 'cosmic web', comprising cosmic voids and galaxy clusters, has been proven to be extremely sensitive to deviations from General Relativity. This could be further investigated by future large-scale surveys, such as with the European Space Agency satellite Euclid. LÄS MER

  7. 20. Effect of chameleons on the mass of a galaxy cluster

    Master-uppsats, Uppsala universitet/Teoretisk astrofysik

    Författare :Isabel Roca Vich; [2019]
    Nyckelord :Chameleons; modified gravity; galaxy cluster;

    Sammanfattning : Chameleons are scalar fields coming from modied gravity theories and can be possible explanations for Dark Energy. They cause a fifth force and have a screening mechanism which allows this force to avoid solar system constraints. In this thesis, astrophysical consequences of the potential presence of the chameleon field will be studied. LÄS MER