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On the scaling relations of disk galaxies

Published online by Cambridge University Press:  26 February 2013

Riccardo Giovanelli
Riccardo Giovanelli*
Affiliation:
Department of Astronomy, Cornell University, Space Sciences Building, Ithaca, NY 14853, USA email: rg39@cornell.edu
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Abstract

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The physical background of scaling laws of disk galaxies is reviewed. The match between analytically derived and observed scaling laws is briefly discussed. Accurate modeling of the fraction of baryons that end up populating a disk, and the conversion efficiency of those into stars, remains a challenging task for numerical simulations. The measurement of rotational velocity tends to be made with criteria of convenience rather than through rigorous definition. And yet, the Tully–Fisher and the disk size versus rotational velocity relations exhibit surprisingly small scatter. Practical recipes (and costs) to optimize the quality of template relations are considered.

Keywords

galaxies: distances and redshiftsgalaxies: halosgalaxies: spiraldistance scale
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 296 - 303
Copyright
Copyright © International Astronomical Union 2013

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