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          Institute: MPI für Astrophysik     Collection: Cosmology     Display Documents



ID: 13514.0, MPI für Astrophysik / Cosmology
Modelling neutral hydrogen discs of spiral galaxies
Authors:Lin, W. P.; Hong, B. H.
Language:English
Date of Publication (YYYY-MM-DD):2002-10
Title of Journal:Chinese Physics Letters
Journal Abbrev.:Chin. Phys. Lett.
Volume:19
Issue / Number:10
Start Page:1565
End Page:1568
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present an analytical model of a neutral hydrogen disc in a spiral galaxy. The gas disc of the spiral galaxy is assumed to have an exponential surface density profile and to be ionized by the cosmic ultraviolet background. To compare with observations, we consider the disc position angle and inclination angle for a line of sight going through the galaxy disc. The HI column densities depend on the strength of ionizing field and disc position and inclination. The model was applied to NGC 3198 and the results were compared with observational data. The HI disc profile at large disc radii can be tested by further HI observations using radio telescopes with a larger aperture than the present facilities. This HI disc model can be used to predict quasar absorption line systems by galaxy discs if quasar lines of sight go through the discs.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Acad Sinica, Shanghai Observ, Max Planck Inst Astrophys,; Partner Grp, Shanghai 200030, Peoples R China; Acad Sinica, Shanghai Observ, Max Planck Inst Astrophys, Partner Grp, Shanghai 200030, Peoples R China; Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China; Peking Univ, Beijing Astrophys Ctr, Beijing 100871, Peoples R China; Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200030, Peoples R China
Identifiers:ISI:000178755700051
ISSN:0256-307X
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