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          Institute: MPI für Astrophysik     Collection: Cosmology     Display Documents

ID: 10989.0, MPI für Astrophysik / Cosmology
The fundamental plane of spiral galaxies: theoretical expectations
Authors:Shen, S. Y.; Mo, H. J.; Shu, C. G.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Issue / Number:1
Start Page:259
End Page:272
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Current theory of disc galaxy formation is used to study fundamental-plane (FP) type of relations for disc galaxies. We examine how the changes in model parameters affect these relations and explore the possibility of using such relations to constrain theoretical models. The distribution of galaxy discs in the space of their fundamental properties are predicted to be concentrated in a plane, with the Tully-Fisher (TF) relation (a relation between luminosity L and maximum rotation velocity V-m) being an almost edge-on view. Using rotation velocities at larger radii generally leads to larger TF scatter. In searching for a third parameter, we find that both the disc scalelength R-d (or surface brightness) and the rotation-curve shape are correlated with the TF scatter. The FP relation in the (log L, log V-m, log R-d)-space obtained from the theory is L proportional to R-d(alpha') V-m(beta'), with alpha' similar to 0.50 and beta' similar to 2.60, consistent with the preliminary result we obtain from observational data. Using the isophotal radius instead of R-d leads to higher alpha', lower beta' and smaller scatter. Among the model parameters we probe, variation in any of them can generate significant scatter in the TF relation, but the effects of the spin parameter and halo concentration can be reduced significantly by introducing R-d While the scatter caused by varying m(d) (the ratio between disc mass and halo mass) is most effectively reduced by introducing the parameters which describe the rotation-curve shape. The TF and FP relations combined should therefore provide useful constraints on models of galaxy formation.
Free Keywords:galaxies : formation; galaxies : fundamental parameters; galaxies : spiral; galaxies : structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030,; Peoples R China; Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China; Max Planck Inst Astrophys, D-85748 Garching, Germany; Chinese Acad Sci, Joint Lab Opt Astron, Beijing 100864, Peoples R China
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