Your browser does not support JavaScript!

Αρχική    Study of the temperature radial dependence in X-ray illuminated accretion disks  

Αποτελέσματα - Λεπτομέρειες

Προσθήκη στο καλάθι
[Προσθήκη στο καλάθι]
Τίτλος Study of the temperature radial dependence in X-ray illuminated accretion disks
Άλλος τίτλος Μελέτη της ακτινικής κατανομής θερμοκρασίας σε δίσκους προσαύξησης που φωτίζονται από ακτίνες Χ
Συγγραφέας Πολιουδάκης, Μιχαήλ
Σύμβουλος διατριβής Παπαδάκης, Ιωσήφ
Περίληψη The main objective of this work was to study the impact of X-ray variability on the radial temperature profile of the accretion disks in AGN. We began by studying the disk temperature profile in the case of a steady, Keplerian, geometrically thin and optically thick accretion disk as a function of radius. This included examining how the black hole mass and accretion rate affect the disk temperature. We then considered the temperature radial profile of accretion disks assuming the relativistic gravitational potential to obtain a more accurate radial temperature profile, and we explored how BH spin influences the disk temperature. Next, we assumed a model of an X-ray illuminated disk with a “lamp-post” corona geometry. Two corona powering mechanisms were considered: one where all the accretion power below a transfer radius is transferred to the corona, and another where the corona is powered by an external source. We studied the radial temperature profile of the illuminated disk, for various values of corona luminosities and heights, and explored how these parameters influence the disk temperature at various radii. We then studied the time evolution of the disk’s radial temperature profile in the case when X-rays that illuminate the disk are variable. First, we considered a single flash of X-ray radiation, and we studied the time delays between the emission of X-rays and the disk’s response to the radiation for various corona heights. Finally, using the results of Kammoun et al. (2024), we examined how the X-ray variability, driven by variations in corona height and luminosity, affects the evolution of the disk temperature in NGC 5548.
Γλώσσα Αγγλικά
Ημερομηνία έκδοσης 2024-11-22
Συλλογή   Σχολή/Τμήμα--Σχολή Θετικών και Τεχνολογικών Επιστημών--Τμήμα Φυσικής--Πτυχιακές εργασίες
  Τύπος Εργασίας--Πτυχιακές εργασίες
Εμφανίσεις 103

Ψηφιακά τεκμήρια
No preview available

Κατέβασμα Εγγράφου
Προβολή Εγγράφου
Εμφανίσεις : 81