NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-26 T01:03:41 PDT
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For refcode 2001MNRAS.326.1141R:
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NED Abstract

Copyright by Royal Astronomical Society. 2001MNRAS.326.1141R Structural evolution in elliptical galaxies: the age-shape relation Barbara S. Ryden, Duncan A. Forbes and A.I. Terlevich Accepted 2001 May 11. Received 2001 May 11; in original form 2000 August 2 ABSTRACT 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 > 7.5 Gyr) 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 = R_e_/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. Keywords: galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: photometry - galaxies: structure.
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