Why there are no elliptical galaxies flatter than E7

Details Why there are no elliptical galaxies flatter than E7 Why there are no elliptical galaxies flatter than E7

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.257..774t&link_type=abstract

Nature, Volume 257, Issue 5529, pp. 774-776 (1975).

Computer Science

17

Scientific paper

IT has long been known1-3 that the flattest elliptical galaxies observed are of type E7, corresponding to an axial ratio of 3.33:1 whereas SO and spiral galaxies are seen with axial ratios up to 20:1. We show, using Maclaurin spheroid models, that an initially spherical protogalaxy, composed entirely of stars, will always relax after a dissipationless collapse to an equilibrium configuration with ɛ ≡ 1-(c/a) <= 0.70925, where a,c are the semi-major, semi-minor axes. This happens regardless of original angular momentum of the galaxy, and is in remarkable agreement with the maximum observed flattening of elliptical galaxies.

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