A study of time-dependent photohadronic cascades in high energy cosmic sources

Doctoral Dissertation uoadl:1309143 553 Read counter

Unit:
Τομέας Αστροφυσικής, Αστρονομίας και Μηχανικής
Library of the School of Science
Deposit date:
2014-01-31
Year:
2014
Author:
Δημητρακούδης Σταύρος
Dissertation committee:
Μαστιχιάδης Απόστολος Αναπλ. Καθηγητής ΕΚΠΑ (επιβλέπων), Τσίγκανος Κανάρης Καθηγητής ΕΚΠΑ, Βλαχάκης Νεκτάριος Επίκ. Καθηγητής ΕΚΠΑ, Αποστολάτος Θεοχάρης Επίκ. Καθηγητής ΕΚΠΑ, Γεωργαντόπουλος Ιωάννης Αναπλ. Διευθυντής Ινστιτούτου Αστρονομίας Αστροφυσικής Διαστημικών Εφαρμογών & Τηλεπισκόπησης Εθνικού Αστεροσκοπείου Αθηνών, Δαγκλής Ιωάννης Καθηγητής ΕΚΠΑ, Κυλάφης Νικόλαος Καθηγητής Πανεπιστημίου Κρήτης
Original Title:
Μελέτη χρονοεξαρτώμενων φωτο-αδρονικών καταιονισμών σε κοσμικές πηγές υψηλών ενεργειών
Languages:
Greek
Translated title:
A study of time-dependent photohadronic cascades in high energy cosmic sources
Summary:
In this work we have studied hadronic radiation models for active galactic
nuclei, by using a self-consistent, time-dependent code that was adapted for
that purpose. To study the relevant systems, we considered a one-zone model in
which protons and/or electrons are continuously injected with some acceleration
mechanism; then we numerically calculate the nonlinear interaction of the
various particle populations that arise. The evolution of the distributions of
those five particle types (protons, electrons, photons, neutrons and neutrinos)
in the source is described by a set of kinetic equations that are solved
simultaneously in the numerical code. To include photohadronic interactions in
the code we used data from the Monte Carlo code SOPHIA, thereby attaining
unprecedented accuracy in this particular field of research. The advanced code
that resulted from this process was used to study both steady states of a
source for various initial condition phase spaces and to fit an observed
source, Mrk 421, based on multiwavelength observations in X rays, gamma rays
and the optical, from which we deduced our estimated neutrino distributions.
Keywords:
Astroparticle physics, Photo hadronic interactions, Sources of extraterrestrial neutrinos, Utrahigh energy cosmic rays, Non thermal radiation mechanisms
Index:
Yes
Number of index pages:
1-4
Contains images:
Yes
Number of references:
148
Number of pages:
VIII, 140
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