Korelacija između kinetičkog Sunayev-Zel'dovich efekta i kozmološkog 21 cm signala neutralnog vodika

master's thesis

• Title (english): Cross-correlation between kinetic Sunyaev-Zel'dovich effect and cosmic 21 cm signal of neutral hydrogen
• Author: Ivan Nikolić
• Mentor: Vibor Jelić (mentor)
• Mentor: Krešimir Pavlovski (komentor)
• Committee member: Krešimir Pavlovski (predsjednik povjerenstva)
• Committee member: Vibor Jelić (član povjerenstva)
• Committee member: Ivica Smolić (član povjerenstva)
• Committee member: Maro Cvitan (član povjerenstva)
• Committee member: Matko Milin (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2020-07-16, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

Kinetički Sunyaev-Zel’dovich (kSZ) efekt je efekt koji nastaje Thomsonovim raspršenjem fotona mikrovalnog kozmičkog zračenja na slobodnim elektronima ionizirane međugalaktičke tvari. Raspršenjem fotona na elektronima stvara se sekundarna anizotropija u mikrovalnom pozadinskom zračenju. kSZ efekt se može koristiti kao proba ionizirane materije u astrofizičkim promatranjima. Kozmološki 21 centimetarski signal dolazi od hiperfinog prijelaza neutralnog vodika i proba je neutralne materije. U ovom radu korištena je semi-numerička simulacija kSZ efekta i signala 21 centimetarske linije, 21cmFAST za istraživanje kSZ efekta u vrijeme epohe reionizacije. Također promatrana je i korelacija kozmološkog 21 cm signala i kSZ signala te je dobivena ovisnost korelacije u epohi reionizacije. Korelacija ovisi o mehanizmu kojim se materija reionizira te periodu reionizacije Svemira. Također su promatrani drugi alati za promatranje korelacije.

Abstract (english)

Kinetic Sunyaev-Zel’dovich (kSZ) effect is an effect originating from Thomson scattering between cosmic microwave background photons and free electrons in the reionized medium. Scattering of photons on electrons creates a secondary anisotropy in the cosmic microwave background. The kSZ effect can be used to probe the ionized matter in the astrophysical observations. The Cosmic 21-centimeter signal comes from the hyperfine transition of neutral hydrogen and is the probe of the neutral matter. In this work semi-numerical simulation of kSZ signal and 21-centimeter signal, 21cm- Fast is used to study the kSZ effect at the epoch of reionization. Cross-correlation between the cosmic 21 cm signal and kSZ signal is observed as well and the evolution of correlation was obtained at the epoch of reionization. Correlation depends on the mechanism by which the medium is reionized and on the stage of the epoch of reionization. Other tools for measuring correlation were also explored.

• Keywords: kSZ efekt; kozmološki 21 cm signal; simulacija; epoha reionizacije; korelacija; neutralni vodik; 21cmFAST
• Keywords (english): kSZ effect; cosmic 21 cm signal; simulation; epoch of reionization; crosscorrelation; neutral hydrogen; 21cmFAST
• Language: croatian
• URN:NBN: urn:nbn:hr:217:900438
• Study programme: Title: Physics; specializations in: Research; Course: Research; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: magistar/magistra fizike (magistar/magistra fizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-01-08 09:44:23