Implications of a Universal Scaling Relation for Galaxies

Details Implications of a Universal Scaling Relation for Galaxies Implications of a Universal Scaling Relation for Galaxies

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396..381z&link_type=abstract

Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at

Physics

Scientific paper

We present a scaling relation that is satisfied by all classes of galaxies, ranging from dwarf spheroidals to brightest cluster galaxies and from disks to spheroidals, log r_{e} - log V^2 + log I_{e} + log Υ_{e} + 0.8 = 0, where r_{e} is the half light radius in kpc, V is a measure of the internal kinematics in km/sec, I_{e} is the surface brightness within r_{e} in L_&sun; pc^{-2}, and Υ_{e} is the I-band mass to light ratio within r_{e}. The low scatter with which galaxies lie about this relationship (0.09 dex) implies a regularity among galaxies that is encouraging to those attempting to uncover the basic physics of galaxy formation and places disk galaxies within the context of all galaxies.

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