Evidence of a Distinct Stellar Population in the Counterrotating Core of NGC 1700

Authors
Dr.
Alexandre Vazdekis
INSTITUTO DE ASTROFÍSICA DE CANARIAS
Date and time
24 May 2011 - 00:00 Europe/London
Address

Aula

Talk language
English
Slides language
English
Serie number
1
Description

We find a distinct stellar population in the counterrotating and kinematically decoupled core of the isolated massive elliptical galaxy NGC 1700. Coinciding with the edge of this core, we find a significant change in the slope of the gradient of various representative absorption line indices. Our age estimate for this core is markedly younger than the main body of the galaxy. We find lower values for the age, metallicity, and Mg/Fe abundance ratio in the center of this galaxy when we compare them with other isolated elliptical galaxies with similar velocity dispersion. We discuss the different possible scenarios that might have lead to the formation of this younger kinematically decoupled structure and conclude that, in light of our findings, the ingestion of a small stellar companion on a retrograde orbit is the most favored.

Type
Format
Breaking News
Elliptical galaxies

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