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Investigating the potential of current and future neutrino detectors to identify the sources of the astrophysical neutrinos seen by IceCube
Stockholm University, Faculty of Science, Department of Physics.
2018 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]

High energy neutrino astronomy aims to view the universe with a new messenger, the neutrino. This messenger provides another window onto the universe, complementing what we can learn from photons, cosmic rays, and gravitational waves. The neutrino constitutes together with these other messengers the so-called multi-messenger approach to studying the universe.

Recently, an all-sky diffuse flux of astrophysical neutrinos has been observed by the IceCube neutrino detector. However, the origins of these astrophysical neutrinos have not yet been clearly identified. Since neutrinos traverse large distances unimpeded, neutrinos from distant and individually faint sources are likely to dominate the extragalactic neutrino flux. This complicates the prospects of identifying the sources of astrophysical neutrinos.

This thesis explores the requirements that different source classes put on a generic neutrino detector, in order for such a detector to be able to resolve individual sources of neutrinos, and investigates which kinds of source classes might be detectable with current and future detectors.

While starburst galaxies may be difficult to resolve if they are the main source of the astrophysical neutrino flux, blazars and active galactic nuclei are promising sources that could be resolved with IceCube or next generation neutrino detectors such as IceCube Gen2.

Abstract [sv]

Målet med neutrinoastronomi är att betrakta vårt universum med en ny budbärare, neutrinon. Denna budbärare erbjuder ett fönster mot universum som komplementerar den bild vi får från fotoner, kosmisk strålning och gravitationsvågor. Genom att använda flera budbärare erhåller vi en mer enhetlig bild av vårt universum.

Ett flöde av astrofysikaliska neutriner observerades nyligen av den på sydpolen belägna neutrinodetektorn IceCube, men ursprunget till dessa neutriner har ännu inte helt klarlagts. Eftersom neutriner kan färdas mycket långa sträckor, utgörs en extragalaktisk komponent troligtvis av neutrinor från mycket avlägsna och svaga källor. Detta försvårar utsikterna att kunna identifiera enskilda astrofysikaliska neutrinokällor.

Denna avhandling utforskar de krav som olika klasser av neutrinokällor ställer på en generisk neutrino detektor, för att en sådan ska kunna upplösa enskilda neutrinokällor, samt undersöker vilka klasser av neutrinokällor vi kan ha hopp om att kunna identifiera med nuvarande och framtida detektorer.

Utifall det astrofysikaliska flödet domineras av neutriner från galaxer med förstärkt stjärnbildning ("starburst galaxies") är identifikation förmodligen svårt. Däremot finns det gott hopp om att kunna identifiera neutriner från de väldigt ljusstarka centrala regionerna som man finner i vissa galaxer ("active galactic nuclei" samt "blazars"), antingen med IceCube eller nästa generations neutrino detektorer, som IceCube Gen2.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University , 2018.
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-155107OAI: oai:DiVA.org:su-155107DiVA, id: diva2:1197076
Presentation
2018-05-02, A4:1003, Albanova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00
Supervisors
Available from: 2019-06-11 Created: 2018-04-11 Last updated: 2019-06-11Bibliographically approved

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