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

Bibcode
2011ApJ...732L..33K
DOI
10.1088/2041-8205/732/2/L33
Kleineberg, K.; Sánchez-Blázquez, P.; Vazdekis, A.
Bibliographical reference

The Astrophysical Journal Letters, Volume 732, Issue 2, article id. L33 (2011).

Advertised on:
5
2011
Number of authors
3
IAC number of authors
2
Citations
8
Refereed citations
8
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.
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Group members
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology
We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.
Ignacio
Martín Navarro
In progress
Type
Refereed
Galaxies

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