HIDRODINAMIČKA I SINHROTRONSKA RADIO-EVOLUCIJA OSTATAKA SUPERNOVIH U NEHOMOGENOJ MEÐUZVEZDANOJ SREDINI

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HIDRODINAMIČKA I SINHROTRONSKA RADIO-EVOLUCIJA OSTATAKA SUPERNOVIH U NEHOMOGENOJ MEÐUZVEZDANOJ SREDINI

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dc.contributor.advisor Vukotić, Branislav
dc.contributor.author Kostić, Petar
dc.date.accessioned 2023-11-22T18:45:42Z
dc.date.available 2023-11-22T18:45:42Z
dc.date.issued 2023-10
dc.identifier.uri http://hdl.handle.net/123456789/5606
dc.description.abstract The models of radio synchrotron emission of supernova remnants (SNRs) imply uniform density ahead of shock wave, so the evolution of luminosity is usu- ally studied in such an environment, most often through the surface-brightness-to- diameter dependence, the Σ–D relation. This field aims to better understand the SNR evolution, the emission models, but also the methods for determining their distance. It is not an easy task because of a very large scatter in the Σ–D Milky Way sample. The dissertation puts a different perspective at the Σ–D relation (usually treated as power-law function), assuming that non-uniform environment around the stars considerably affects its shape and slope, that may vary during the SNR expansion. It makes the ambient density structure an important factor whose impact must be investigated. The numerical code for hydrodynamic (HD) simulations and the emission model were developed. The 3D HD simulations were performed in different non-uniform environments, including low-density bubbles and a variety of clumpy models. Based on the simulation results, a semi-analytical 3D spherically-symmetric model of HD and Σ–D evolution of SNRs in clumpy medium was developed, which is used to generate large Σ–D samples. The results show that after entering the clumpy medium the SNR brightness enhances, but afterward the Σ–D slope steepens, shortening the brightness evolu- tion lifetime. Despite the evident increase in slope in clumpy medium, the Galactic sample average slope flattens at ≈ 13–50 pc. After analyzing the generated SNR samples in clumpy medium it is concluded that the significant flattening and scatter in Galactic sample originates in sporadic emission jumps of individual SNRs in a limited diameter interval. The additional analyses of selection effects are needed to investigate these issues. en_US
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dc.description.provenance Made available in DSpace on 2023-11-22T18:45:42Z (GMT). No. of bitstreams: 1 Kostic_Petar_disertacija.pdf: 1947758 bytes, checksum: 87817e444b72cd499d96bc1d9540b99d (MD5) Previous issue date: 2023-10 en
dc.language.iso sr en_US
dc.publisher b en_US
dc.title HIDRODINAMIČKA I SINHROTRONSKA RADIO-EVOLUCIJA OSTATAKA SUPERNOVIH U NEHOMOGENOJ MEÐUZVEZDANOJ SREDINI en_US
mf.author.birth-date 1985-07-17
mf.author.birth-place Novi Sad en_US
mf.author.birth-country Srbija en_US
mf.author.residence-state Srbija en_US
mf.author.citizenship Srpsko en_US
mf.author.nationality Srbin en_US
mf.subject.area astrophysics en_US
mf.subject.keywords interstellar medium: supernova remnants, interstellar medium: clouds, hydrodynamics, shock waves, radiation mechanisms: non-thermal, methods: numer- ical, methods: analytical en_US
mf.subject.subarea supernova remnants en_US
mf.contributor.committee Urošević, Dejan
mf.contributor.committee Arbutina, Bojan
mf.contributor.committee Knežević, Slađana
mf.contributor.committee Onić, Dušan
mf.university.faculty Mathematical Faculty en_US
mf.document.pages 108 en_US
mf.document.location Belgrade en_US
mf.document.genealogy-project No en_US
mf.university Belgrade Univeristy en_US

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