Journal Article

The universal Faber–Jackson relation

R. H. Sanders

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 2, pages 1128-1134
Published in print September 2010 | ISSN: 0035-8711
Published online September 2010 | e-ISSN: 1365-2966 | DOI:
The universal Faber–Jackson relation

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In the context of modified Newtonian dynamics, the Fundamental Plane, as the observational signature of the Newtonian virial theorem, is defined by high-surface-brightness objects that deviate from being purely isothermal: the line-of-sight velocity dispersion should slowly decline with radius as observed in luminous elliptical galaxies. All high-surface-brightness objects (e.g. globular clusters, ultra-compact dwarfs) will lie, more or less, on the Fundamental Plane defined by elliptical galaxies, but low-surface-brightness objects (dwarf spheroidals) would be expected to deviate from this relation. This is borne out by observations. With Milgrom's modified Newtonian dynamics (MOND), the Faber–Jackson relation (L∝σ4), ranging from globular clusters to clusters of galaxies and including both high- and low-surface-brightness objects, is the more fundamental and universal scaling relation in spite of its larger scatter. The Faber–Jackson relation reflects the presence of an additional dimensional constant (the MOND acceleration a0) in the structure equation.

Keywords: galaxies: elliptical and lenticular, cD; galaxies: fundamental parameters; galaxies: kinematics and dynamics

Journal Article.  5437 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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