Essays about: "accretion"

Showing result 16 - 20 of 62 essays containing the word accretion.

  1. 16. Superradiant axion clouds and their interaction with astrophysical plasma

    University essay from KTH/Fysik

    Author : Erik Engstedt; [2021]
    Keywords : axions; superradiance; black holes; black hole accretion; astrophysical plasma; axioner; strålningsförstärkning; svarta hål; svart hålansamling; astrofysikalisk plasma;

    Abstract : Axions are one of the best-motivated particles beyond the standard model of particle physics and a promising candidate for dark matter. Through the superradiant instability, axions can extract a significant amount of rotational energy from spinning black holes resulting in dense axion clouds. READ MORE

  3. 17. Archaeologic inspection of the Milky Way using vibrations of a fossil : Seismic, spectroscopic and kinematic characterization of a binary metal-poor Halo star

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Amanda Byström; [2020]
    Keywords : Milky Way; Halo; galactic archaeology; asteroseismology; binary star; CEMP stars; CEMP-r s stars; stellar age; stellar mass; chemical abundance pattern; Gaia-Enceladus; Gaia-Sausage; Sequoia; spectroscopy; metal-poor;

    Abstract : The Milky Way has undergone several mergers with other galaxies during its lifetime. The mergers have been identified via stellar debris in the Halo of the Milky Way. The practice of mapping these mergers is called galactic archaeology. To perform this archaeologic inspection, three stellar features must be mapped: chemistry, kinematics and age. READ MORE

  4. 18. Classification of four mesosiderites and implications for their formation

    University essay from Lunds universitet/Geologiska institutionen

    Author : Gabriel Zachén; [2020]
    Keywords : mesosiderites; meteorites; stony-irons; classification; textures shock; emulsion; melt droplet; Lamont Acfer 265; QUE 86900; MAC 88102; Earth and Environmental Sciences;

    Abstract : Mesosiderites are rare stony-iron meteorites with enigmatic origins. Their unusual mix of crustal and core materials have inspired many formation theories over the last century. READ MORE

  5. 19. Lyman Continuum Radiation from Intermediate-Mass Black Holes : An Estimation of the Contribution of LyC Radiation from IMBHs in z~3 Galaxies

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Marika Ljungberg; [2020]
    Keywords : intermediate-mass black holes; cosmic reionization; high-redshift galaxies;

    Abstract : This thesis concerns the cosmic reionization of the intergalactic medium in the high redshift universe and, in particular, is a first approach to examine what role intermediate mass black holes (IMBHs) play in this cosmic age. Unexpectedly high values of hydrogen ionizing radiation, compared to current models, have been reported from galaxies at redshift ~3 (used as stand-ins for galaxies at the age of reionization), and thus these models need revision, potentially by adding effects of IMBH content in the galaxies. READ MORE

  6. 20. Defining, analyzing and determining power losses - due to icing on wind turbine blades

    University essay from Mälardalens högskola/Akademin för ekonomi, samhälle och teknik

    Author : Zandra Canovas Lotthagen; [2020]
    Keywords : Wind Power; De-icing; Defining; Ice losses; Task19; Temperature threshold; Power curve; Big Data;

    Abstract : The wind power industry is one of the fastest-growing renewable energy industries in the world. Since more energy can be extracted from wind when the density is higher, a lot of the investments made in the wind power industry are made in cold climates. But with cold climates come harsh weather conditions such as icing. READ MORE