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review article

Simulations of galactic disks including a dark baryonic component

Revaz, Y.  
•
Pfenniger, D.
•
Combes, F.
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2009
Astronomy & Astrophysics

The near proportionality between HI and dark matter in outer galactic disks prompted us to run N-body simulations of galactic disks in which the observed gas content is supplemented by a dark gas component representing between zero and five times the visible gas content. While adding baryons in the disk of galaxies may solve some issues, it poses the problem of disk stability. We show that the global stability is ensured if the ISM is multiphased, composed of two partially coupled phases, a visible warm gas phase and a weakly collisionless cold dark phase corresponding to a fraction of the unseen baryons. The phases are subject to stellar and UV background heating and gas cooling, and their transformation into each other is studied as a function of the coupling strength. This new model, which still possesses a dark matter halo, fits the rotation curves as well as the classical CDM halos, but is the only one to explain the existence of an open and contrasting spiral structure, as observed in the outer HI disks

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Type
review article
DOI
10.1051/0004-6361/200809883
Web of Science ID

WOS:000267965100015

Author(s)
Revaz, Y.  
•
Pfenniger, D.
•
Combes, F.
•
Bournaud, F.
Date Issued

2009

Published in
Astronomy & Astrophysics
Volume

501

Start page

171

End page

187

Subjects

galaxies: evolution

•

galaxies: ISM

•

galaxies: structure

•

galaxies: general

•

galaxies: kinematics and dynamics

•

Surface Brightness Galaxies

•

Resolution Rotation Curves

•

Tully-Fisher Relation

•

Recent Star-Formation

•

Extreme Outer Disk

•

Detecting Cold H-2

•

Spiral Galaxies

•

Mass-Distribution

•

Milky-Way

•

Molecular-Hydrogen

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
Available on Infoscience
November 30, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/60067
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