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X-Ray Binaries and Ultraluminous X-Ray Sources

Uproszczony widok
dc.abstract.enIn this thesis I investigate the population of X-ray binaries (XRB) and ultraluminous X-ray sources (ULX) in order to approach several contemporary astrophysical conundrums. My main method of analysis is the population synthesis, which allows for a comprehensive comparison of theoretical models and observations. I provide an introduction with fundamental knowledge concerning XRBs and ULXs. Firstly, I approach a problem of the mass gap, i.e., the lack of compact objects with masses between 2 5 M . I show that the rapid supernova explosion mechanism can provide a natural explanation for the observed separation between neutron stars and black holes. Afterwards, I investigate the common envelope. This important phase of evolution of binaries still escapes the grasp of our understanding. I show that, although the common envelope phase is essential for the formation of XRB, none of currently available models is able to reproduce the observations. I analyse also the formation of the most luminous ULXs. I show that it is possible to obtain mass transfer rates high enough to power such a source in regular XRBs. The phase of powerful emission will be very short but present in the evolution of numerous systems. Finally, I present the preliminary results of the investigation of accretion models in the context of the ULX population. I compare the synthetic population, which is based on our best knowledge of astrophysical processes, with the observations in order to understand the nature and formation processes of these systems.
dc.affiliation.departmentObserwatorium Astronomiczne Uniwersytetu Warszawskiego
dc.contributor.authorWiktorowicz, Grzegorz
dc.date.available2024-01-18T12:36:15Z
dc.date.defence2016-06-29
dc.date.issued2016-03-04
dc.description.osid94987
dc.description.promoterBelczyński, Krzysztof
dc.description.promoterSobolewska, Małgorzata
dc.identifier.apd14095
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/1580
dc.language.isoen
dc.rightsFairUse
dc.subject.enbinary stars
dc.subject.enstellar evolution
dc.subject.enneutron stars
dc.subject.enblack holes
dc.subject.enX-ray binaries
dc.subject.ensupernovae
dc.subject.enaccretion disks
dc.subject.plgwiazdy podwójne
dc.subject.plewolucja gwiazdowa
dc.subject.plgwiazdy neutronowe
dc.subject.plczarne dziury
dc.subject.plrentgenowskie układy podwójne
dc.subject.plsupernowe
dc.subject.pldyski akrecyjne
dc.titleX-Ray Binaries and Ultraluminous X-Ray Sources
dc.title.alternativeRentgenowskie układy podwójne i ultrajasne źródła rentgenowskie
dc.typeDoctoralThesis
dspace.entity.typePublication