A dynamical model for the extraplanar gas in spiral galaxies

ABSTRACT Recent H i observations reveal that the discs of spiral galaxies are surrounded by extended gaseous haloes. This extraplanar gas reaches large distances (several kiloparsecs) from the disc and shows peculiar kinematics (low rotation and inflow). We have modelled the extraplanar gas as a con...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2006-02, Vol.366 (2), p.449-466
Main Authors: Fraternali, F., Binney, J. J.
Format: Article
Language:English
Subjects:
Astronomy
Comparative analysis
Earth, ocean, space
Exact sciences and technology
galaxies: evolution
galaxies: haloes
galaxies: individual: NGC 2403
galaxies: individual: NGC 891
galaxies: kinematics and dynamics
Gases
ISM: kinematics and dynamics
Kinematics
Stars & galaxies
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Summary:ABSTRACT Recent H i observations reveal that the discs of spiral galaxies are surrounded by extended gaseous haloes. This extraplanar gas reaches large distances (several kiloparsecs) from the disc and shows peculiar kinematics (low rotation and inflow). We have modelled the extraplanar gas as a continuous flow of material from the disc of a spiral galaxy into its halo region. The output of our models is pseudo data cubes that can be directly compared to the H i data. We have applied these models to two spiral galaxies (NGC 891 and NGC 2403) known to have a substantial amount of extraplanar gas. Our models are able to reproduce accurately the vertical distribution of extraplanar gas for an energy input corresponding to a small fraction (
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2005.09816.x