Doctoral theses
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Identifier |
000451609 |
Title |
Estimating the magnetic field strength in the interstellar medium |
Alternative Title |
Εκτίμηση της έντασης του μαγνητικού πεδίου στο μεσοαστρικό μέσο |
Author
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Σκαλίδης, Ραφαήλ Κ
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Thesis advisor
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Τάσσης, Κωνσταντίνος
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Reviewer
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Παπαδάκης, Ιωσήφ
Χαρμανδάρης, Βασίλης
Αντωνιάδης, Ιωάννης
Ζέζας, Ανδρέας
André, Philippe
Tan, Jonathan
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Abstract |
A large scale magnetic field permeates the interstellar medium (ISM) of our Galaxy. The
ISM magnetic field strength is notoriously difficult to measure, and for this reason there is
a longstanding debate about its dynamical importance in the star formation process. The
magnetic field strength can be directly measured, with the Zeeman effect, only in a limited
number of cases. For this reason, indirect methods have been developed for estimating the
magnetic field strength. The most widely accessible methods are based on dust polarization.
Dust polarization probes directly the plane-of-the-sky magnetic field morphology, but not its
strength. These indirect magnetic field strength estimation methods are based on the energy
balance of incompressible turbulence. Observations, however, indicate that turbulence in the
ISM is highly compressible, hence the assumptions of the existing methods are incompatible
with the observations. In this thesis, we propose a novel method for estimating the magnetic
field strength from dust polarization based on the energetics of compressible turbulence. We
assess the accuracy of the proposed method with synthetic data produced from a suite of
numerical simulations. We find that with the proposed method an accuracy better than a
factor of two can be achieved.
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Language |
English |
Subject |
Dust polarization |
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Magnetic fields |
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Star formation |
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Αστρογένεση |
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Μαγνητικά πεδία |
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Πόλωση σκόνης |
Issue date |
2023-01-09 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Doctoral theses
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Type of Work--Doctoral theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/6/3/7/metadata-dlib-1665664961-300515-13094.tkl
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Views |
1147 |