SIMBAD references

2001MNRAS.326.1141R - Mon. Not. R. Astron. Soc., 326, 1141-1148 (2001/September-3)

Structural evolution in elliptical galaxies: the age-shape relation.

RYDEN B.S., FORBES D.A. and TERLEVICH A.I.

Abstract (from CDS):

We test the hypothesis that the apparent axial ratio of an elliptical galaxy is correlated with the age of its stellar population. We find that old ellipticals (with estimated ages t>7.5Gyr) are rounder on average than younger ellipticals. The statistical significance of this shape difference is greatest at small radii; a Kolmogorov-Smirnov test comparing the axial ratios of the two populations at R=Re/16 yields a statistical significance greater than 99.96 per cent. The relation between age and apparent shape is linked to the core/power-law surface brightness profile dichotomy. Core ellipticals have older stellar populations, on average, than power-law ellipticals and are rounder in their inner regions. Our findings are consistent with a scenario in which power-law ellipticals are formed in gas-rich mergers, while core ellipticals form in dissipationless mergers, with cores formed and maintained by the influence of a binary black hole.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: photometry - galaxies: structure

Simbad objects: 75

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2021.02.26-05:27:30

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