Unit:
Κατεύθυνση Αστροφυσική, Αστρονομία και Μηχανική (ΒΑΣΙΚΗ ΦΥΣΙΚΗ)Library of the School of Science
Supervisors info:
Παναγιώτης Πάτσης Δ/ντης Ερευνών (επιβλέπων), Χατζηδημητρίου Δέσποινα Αναπλ. Καθηγήτρια , Καζαντζίδης Στυλιανός Επίκ. Καθηγητής
Original Title:
Η σπειροειδής δομή των γαλαξιακών δίσκων και ο προσδιορισμός της συμπεριστροφής με κινηματικές μεθόδους.
Translated title:
The spiral structure of galactic disks and the location of the corotation resonance using kinematic methods.
Summary:
The location of the corotation or equivalently the value of the pattern speed of
the spirals, is crucial in order to understand the morphology and the dynamics
of spiral galaxies. However, there is a difficulty in finding the pattern
speed, as
it cannot be measured directly by observations. Its value is usually evaluated
by
correlating the main resonances with some characteristics of the spiral
structure,
like the end of the spiral arms. An assessment of this hypothesis is done by
means of models. Response models are constructed in order to compare the
responses of galactic disks rotating with a given value of the pattern speed
with
photometric observations. However, there have been made some attempts to
find corotation directly using kinematic methods. On this thesis, we present
such
a method, namely the Canzian’s method, and we apply it in response models
of disk galaxies. Our goal is to understand the potential and the constraints of
this method and to propose systems that it can be applied giving reliable
results.
Keywords:
Galaxies: kinematics and dynamics, Galaxies: spiral, Galaxies: structure, ISM: kinematics and dynamics, Methods: numerical
