Sökning: "Miquel Colom i Bernadich"

Hittade 3 uppsatser innehållade orden Miquel Colom i Bernadich.

  1. 1. Ultraluminous sources in X-ray sky surveys

    Master-uppsats, Uppsala universitet/Högenergifysik

    Författare :Miquel Colom i Bernadich; [2020]
    Nyckelord :X-rays; X-ray astronomy; black holes; neutron stars; accretion physics; XMM-Newton; eROSITA;

    Sammanfattning : Ultraluminous X-ray sources (ULXs) are extragalactic, non-nuclear, point-like X-ray sources whose luminosity supersedes that of the Eddington limit of an accreting stellar mass black hole (L> 10 ^ 39 erg / s). Most of them are powered by black holes and neutron stars undergoing genuine super-Eddington accretion, with a small handful of candidates being consistent with sub-Eddington accretion on an intermediate mass black hole. LÄS MER

  3. 2. Measuring the Characteristic Sizes of Convection Structures in AGB Stars with Fourier Decomposition Analyses : the Stellar Intensity Analyzer (SIA) Pipeline.

    Master-uppsats, Uppsala universitet/Teoretisk astrofysik

    Författare :Miquel Colom i Bernadich; [2020]
    Nyckelord :Asymptotic Giant Branch; AGB; red giants; stars; stellar convection; Fourier analysis; convection cells;

    Sammanfattning : Context. Theoretical studies predict that the length scale of convection in stellar atmospheres isproportional to the pressure scale height, which implies that giant and supergiant stars should have convection granules of sizes comparable to their radii. LÄS MER

  4. 3. Constraints on the Kaluza-Klein Photon as a Dark Matter Candidate from the IceCube Collaboration Results

    L3-uppsats, Uppsala universitet/Högenergifysik

    Författare :Miquel Colom i Bernadich; [2019]
    Nyckelord :dark matter; WIMP; Kaluza-Klein; IceCube; neutrinos; muon neutrinos; muons;

    Sammanfattning : New constraints on the scattering cross sections of the Kaluza Klein photon as a darkmatter candidate, its annihilation rate in the Sun and the resulting muon flux on Earth are derived.For this purpose, data collected in the IceCube Neutrino Observatory during 532 days of exposurein the austral winters between 2011 and 2014 have been analyzed with Poisson confidence intervals (J. LÄS MER