Unit:
Κατεύθυνση Αστροφυσική, Αστρονομία και Μηχανική (ΒΑΣΙΚΗ ΦΥΣΙΚΗ)Library of the School of Science
Supervisors info:
Απόστολος Μαστιχιάδης, Καθηγητής, Τμήμα Φυσικής, ΕΚΠΑ
Δέσποινα Χατζηδημητρίου, Αναπληρώτρια Καθηγήτρια, Τμήμα Φυσικής, ΕΚΠΑ
Νεκτάριος Βλαχάκης, Αναπληρωτής Καθηγητής, Τμήμα Φυσικής, ΕΚΠΑ
Original Title:
Μοντελοποίηση Ακτίνων - Χ σε Πίδακες Μεγάλης Κλίμακας
Translated title:
Μodels of X - ray emission in large scale jets
Summary:
In 1999 August, the Chandra X – Ray Observatory observed its first celestial target, the radio – loud quasar PKS 0637 – 752. Along with the bright X – ray quasar core, owing to its remarkable space resolution, Chandra unexpectedly detected X – rays from the kiloparsec scale jet. Since then the Chandra X – Ray Observatory has discovered many kiloparsec scale jets in a variety of AGN classes such as FRI and FRII radio galaxies, BL Lacs and quasars in which the X – Ray fluxes are observed to be much higher than the expected level based on the radio – optical synchrotron spectrum. The EC/CMB has been by far the most popular explanation of the production of these X – Rays, while other models have been proposed. In this project our goal is to interpret the strong X – Ray emission from the large scale jet of quasar PKS 0637 - 752, in the context of leptonic as well as hadronic models. The leptonic models that are investigated are EC/CMB, synchrotron Self Compton and synchrotron emission from two separate electron populations, while the hadronic one that is examined is proton synchrotron. We find that all four models can satisfactorily fit the data. However, in comparison with the other models, we conclude that the most plausible interpretation of the large scale jet spectrum comes from EC/CMB, while even this one faces some difficulties, such as the non – detection of the predicted g – rays.
Main subject category:
Science
Keywords:
quasars, large scale jets, X – Rays, leptonic models, hadronic models
