Sökning: "Roisin Brogan"

Hittade 4 uppsatser innehållade orden Roisin Brogan.

  1. 1. Identifying Gravitationally Lensed QSO Candidates with eROSITA

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Róisín O'Rourke Brogan; [2020]
    Nyckelord :active galactic nuclei; agn; erosita; gaia; gravitational lensing; quasi-stellar objects; strong lensing; multiple images;

    Sammanfattning : As of June 2020, the first all-sky X-ray survey with the eROSITA instrument aboard the spacecraft Spektr-RG has been completed. A high percentage of the 1.1 million objects included in the survey are expected to be active galactic nuclei (AGN). LÄS MER

  3. 2. AGN Candidates for High Energy Neutrino Emission in IceCube

    Master-uppsats, Uppsala universitet/Högenergifysik

    Författare :Roisín O'Rourke Brogan; [2020]
    Nyckelord :active galactic nuclei; agn; high energy physics; neutrinos; IceCube; blazars; jets; gamma emission;

    Sammanfattning : Since the construction of the IceCube Neutrino Observatory was completed in 2010, many amazing discoveries have been made in the field of neutrino physics. Recently a neutrino event has been linked to an blazar-type active galactic nucleus source, bringing us one step closer to understanding the production of high-energy extragalactic neutrinos and ushering in a new era of multimessenger astronomy. LÄS MER

  4. 3. Testing the multi-epoch luminosity function of asymptotic giant branch stars in the Small Magellanic Cloud with VISTA

    Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Róisín O'Rourke Brogan; [2020]
    Nyckelord :stars: AGB; stars: late-type; stars: atmospheres; stars: variable; small magellanic cloud; magellanic system; stellar populations; model stellar populations; dwarf galaxies;

    Sammanfattning : The physics pertaining to the asymptotic giant branch (AGB) phase of stellar evolution has been studied for many years. However, the mechanics behind many characteristics displayed at this stage are still not fully understood. LÄS MER

  5. 4. The Variability of the R Magnitude in Dynamical Models of AGB Stars

    L3-uppsats, Uppsala universitet/Teoretisk astrofysik

    Författare :Roisin Brogan; [2019]
    Nyckelord :stars: AGB; stars: late-type; stars: atmospheres; stars: variable;

    Sammanfattning : This report will first give a brief background on asymptotic giant branch (AGB) stars and the characteristics that make them interesting to study. Some methods and tools used in the field are then introduced, before the photometric variability of these stars is investigated. LÄS MER