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Title: EVIDENCE OF A DISTINCT STELLAR POPULATION IN THE COUNTERROTATING CORE OF NGC 1700

Abstract

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.

Authors:
;  [1];  [2]
  1. Instituto de Astrofisica de Canarias, E38200 La Laguna, Tenerife (Spain)
  2. Departamento de Fisica Teorica, Universidad Autonoma de Madrid, Cantoblanco, E28049 Madrid (Spain)
Publication Date:
OSTI Identifier:
21562685
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 732; Journal Issue: 2; Other Information: DOI: 10.1088/2041-8205/732/2/L33; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AGE ESTIMATION; GALAXIES; STARS

Citation Formats

Kleineberg, K, Vazdekis, A, and Sanchez-Blazquez, P. EVIDENCE OF A DISTINCT STELLAR POPULATION IN THE COUNTERROTATING CORE OF NGC 1700. United States: N. p., 2011. Web. doi:10.1088/2041-8205/732/2/L33.
Kleineberg, K, Vazdekis, A, & Sanchez-Blazquez, P. EVIDENCE OF A DISTINCT STELLAR POPULATION IN THE COUNTERROTATING CORE OF NGC 1700. United States. https://doi.org/10.1088/2041-8205/732/2/L33
Kleineberg, K, Vazdekis, A, and Sanchez-Blazquez, P. 2011. "EVIDENCE OF A DISTINCT STELLAR POPULATION IN THE COUNTERROTATING CORE OF NGC 1700". United States. https://doi.org/10.1088/2041-8205/732/2/L33.
@article{osti_21562685,
title = {EVIDENCE OF A DISTINCT STELLAR POPULATION IN THE COUNTERROTATING CORE OF NGC 1700},
author = {Kleineberg, K and Vazdekis, A and Sanchez-Blazquez, P},
abstractNote = {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.},
doi = {10.1088/2041-8205/732/2/L33},
url = {https://www.osti.gov/biblio/21562685}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 732,
place = {United States},
year = {Tue May 10 00:00:00 EDT 2011},
month = {Tue May 10 00:00:00 EDT 2011}
}