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Stellar radial migration and thick disks in spiral galaxies

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TitleInfo
Title
Stellar radial migration and thick disks in spiral galaxies
Name (type = personal)
NamePart (type = family)
Solway
NamePart (type = given)
Michael
NamePart (type = date)
1985-
DisplayForm
Michael Solway
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Sellwood
NamePart (type = given)
Jerry A.
DisplayForm
Jerry A. Sellwood
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Williams
NamePart (type = given)
Theodore B.
DisplayForm
Theodore B. Williams
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Keeton
NamePart (type = given)
Charles R.
DisplayForm
Charles R. Keeton
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Rabe
NamePart (type = given)
Karin M.
DisplayForm
Karin M. Rabe
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Debattista
NamePart (type = given)
Victor P.
DisplayForm
Victor P. Debattista
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2013
DateOther (qualifier = exact); (type = degree)
2013-10
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
We present four studies of radial migration of stars in thickened galactic disks and its relation to the possible internal formation of thick disks. This is an effect caused by transient spirals during which stars that corotate with a spiral gain or lose angular momentum and migrate radially while remaining on nearly circular orbits. The overall angular momentum distribution and surface density of the disk remains unchanged however. Our tools are collisionless N-body simulations that each simulate a single disk galaxy. First, we study the extent to which radial migration is affected by the vertical motion of stars. We find that rms angular momentum changes are reduced by it, but rather gradually, and the maximum changes are almost as large for thick disk stars as for those in a thin disk. Radial migration is also weaker in disks with greater velocity dispersions and under spirals of lower amplitude or greater number of arms. In barred simulations, it is slightly stronger outside the bar than in comparable cases with just spirals, but the cumulative effect of multiple spiral events still dominates. In the second study, we determine that vertical actions, and not vertical energies, of stars are conserved on average during radial migration. Then, we test the hypothesis that bars suppress the outwards radial migration from the inner galactic region that is capable of building a thick disk in the outer regions. If this works, it can explain why the Milky Way thick disk primarily contains old stars. First, however, we check whether realistic thick disks form in our simulations by this proposed outwards migration mechanism. We find that they do not, and attribute it to our particle addition prescription and the not strong enough spiral activity. Nevertheless, we go on to test the above hypothesis, and indeed find that bars significantly reduce this outwards migration. Although small and slow variations of the bar properties allow some trapped particles to escape, new stars that would form inside the bar would be born deep in its potential well, and would remain trapped.
Subject (authority = RUETD)
Topic
Physics and Astronomy
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_4978
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
xxv, 218 p. : ill.
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Michael Solway
Subject (authority = ETD-LCSH)
Topic
Stars--Orbits
Subject (authority = ETD-LCSH)
Topic
Galactic dynamics
Subject (authority = ETD-LCSH)
Topic
Physics--Research
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier (type = doi)
doi:10.7282/T3R20ZDK
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Solway
GivenName
Michael
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2013-09-06 11:42:59
AssociatedEntity
Name
Michael Solway
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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Technical

RULTechMD (ID = TECHNICAL1)
ContentModel
ETD
OperatingSystem (VERSION = 5.1)
windows xp
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