The Formation of Polar Disk Galaxies

Polar ring galaxies, such as NGC 4650A, are a class of galaxies that have two kinematically distinct components that are inclined by almost 90 degree to each other. These striking galaxies challenge our understanding of how galaxies form; the origin of their distinct components has remained uncertai...

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Published inThe Astrophysical journal Vol. 689; no. 2; pp. 678 - 686
Main Authors Brook, Chris B, Governato, Fabio, Quinn, Thomas, Wadsley, James, Brooks, Alyson M, Willman, Beth, Stilp, Adrienne, Jonsson, Patrik
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 20.12.2008
IOP
Subjects
Astronomy
Earth, ocean, space
Exact sciences and technology
Galaxy evolution
galaxies: formation
Galaxy formation
galaxies: evolution
Disk galaxies
Cosmology
cosmology: theory
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Abstract Polar ring galaxies, such as NGC 4650A, are a class of galaxies that have two kinematically distinct components that are inclined by almost 90 degree to each other. These striking galaxies challenge our understanding of how galaxies form; the origin of their distinct components has remained uncertain and is the subject of much debate. We use high-resolution cosmological simulations of galaxy formation to show that polar ring galaxies are simply an extreme example of the misalignment of angular momentum that occurs during the hierarchical structure formation characteristic of a cold dark matter cosmology. In our model, polar ring galaxies form through the continuous accretion of gas whose angular momentum is misaligned with the central galaxy.
AbstractList Polar ring galaxies, such as NGC 4650A, are a class of galaxies that have two kinematically distinct components that are inclined by almost 90' to each other. These striking galaxies challenge our understanding of how galaxies form; the origin of their distinct components has remained uncertain and is the subject of much debate. We use high-resolution cosmological simulations of galaxy formation to show that polar ring galaxies are simply an extreme example of the misalignment of angular momentum that occurs during the hierarchical structure formation characteristic of a cold dark matter cosmology. In our model, polar ring galaxies form through the continuous accretion of gas whose angular momentum is misaligned with the central galaxy.
Polar ring galaxies, such as NGC 4650A, are a class of galaxies that have two kinematically distinct components that are inclined by almost 90 degree to each other. These striking galaxies challenge our understanding of how galaxies form; the origin of their distinct components has remained uncertain and is the subject of much debate. We use high-resolution cosmological simulations of galaxy formation to show that polar ring galaxies are simply an extreme example of the misalignment of angular momentum that occurs during the hierarchical structure formation characteristic of a cold dark matter cosmology. In our model, polar ring galaxies form through the continuous accretion of gas whose angular momentum is misaligned with the central galaxy.
Author Governato, Fabio
Stilp, Adrienne
Quinn, Thomas
Wadsley, James
Jonsson, Patrik
Willman, Beth
Brook, Chris B
Brooks, Alyson M
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  fullname: Willman, Beth
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  fullname: Stilp, Adrienne
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galaxies: formation
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Cosmology
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Snippet Polar ring galaxies, such as NGC 4650A, are a class of galaxies that have two kinematically distinct components that are inclined by almost 90 degree to each...
Polar ring galaxies, such as NGC 4650A, are a class of galaxies that have two kinematically distinct components that are inclined by almost 90' to each other....
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SubjectTerms Astronomy
Earth, ocean, space
Exact sciences and technology
Title The Formation of Polar Disk Galaxies
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