MODELOVANJE OPTIČKIH SPEKTARA AKTIVNIH GALAKTIČKIH JEZGARA TIPA 1

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MODELOVANJE OPTIČKIH SPEKTARA AKTIVNIH GALAKTIČKIH JEZGARA TIPA 1

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dc.contributor.advisor Ilić, Dragana
dc.contributor.author Rakić, Nemanja
dc.date.accessioned 2022-09-05T12:26:28Z
dc.date.available 2022-09-05T12:26:28Z
dc.date.issued 2022
dc.identifier.uri http://hdl.handle.net/123456789/5451
dc.description.abstract Active Galactic Nuclei (AGN) are galaxy cores in which a supermassive black hole is being surrounded with an accretion disk, which emits powerful continuum emission. This continuum ionizes the surrounding gas which than emits the broad lines, detected in the optical band. The aim of this thesis is to model complex optical spectra of large numbers of type 1 AGNs (AGNs with broad emission lines) and study physical properties of the emitting gas, so-called broad line region. Understanding the physics of the broad line region, as well as the physics of AGN as a whole is important for understanding the galaxy formation and evolution. This thesis investigate a large sample of type 1 AGNs taken from the SDSS spectral database. In total, over 1500 spectra were analyzed, for which a completely new software for modeling of optical AGN spectra (named FANTASY) was developed. Automated simultaneous modeling of all emission components in the optical spectrum enables reliable measurement of spectral parameters, which can have significant application in future investigation of large AGN samples, collected within the upcoming large spectroscopic sky surveys. The physical properties in the broad line region were studied through the analysis of a still unexplained (anti)correlation between the equivalent width of the emission lines and the conti- nuum flux (the so-called Baldwin effect). It has been confirmed that the intrinsic Baldwin effect exists in the Balmer hydrogen lines in type 1 AGNs, and that a potential physical explanati- on for this effect might be presence of an additional non-ionizing optical continuum emission, which originates from the broad line region. Finally, the significant outcome of this thesis is is the new publicly available software package FANTASY, which can be widely used in the future spectral analysis of AGN. en_US
dc.description.provenance Submitted by Slavisha Milisavljevic (slavisha) on 2022-09-05T12:26:28Z No. of bitstreams: 1 Doktorska_disertacija_nrakic.pdf: 5806910 bytes, checksum: da3de209da01c17c7f435fea2d03d9b2 (MD5) en
dc.description.provenance Made available in DSpace on 2022-09-05T12:26:28Z (GMT). No. of bitstreams: 1 Doktorska_disertacija_nrakic.pdf: 5806910 bytes, checksum: da3de209da01c17c7f435fea2d03d9b2 (MD5) Previous issue date: 2022 en
dc.language.iso sr en_US
dc.publisher Beograd en_US
dc.title MODELOVANJE OPTIČKIH SPEKTARA AKTIVNIH GALAKTIČKIH JEZGARA TIPA 1 en_US
mf.author.birth-date 1986-06-01
mf.author.birth-place Sarajevo en_US
mf.author.birth-country Bosna i Hercegovina en_US
mf.author.residence-state Srbija en_US
mf.author.citizenship Srpsko en_US
mf.author.nationality Srbin en_US
mf.subject.area Astronomy en_US
mf.subject.keywords Active Galactic Nuclei, supermassive black holes, spectroscopy, emission lines en_US
mf.subject.subarea Astrophysics en_US
mf.contributor.committee Ilić, Dragana
mf.contributor.committee Popović, Luka
mf.contributor.committee Kovačević-Dojčinović, Jelena
mf.university.faculty Mathematical faculty en_US
mf.document.pages 167 en_US
mf.document.location Beograd en_US
mf.document.genealogy-project No en_US
mf.university Belgrade University en_US

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