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.
Referencia bibliográfica

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

Fecha de publicación:
5
2011
Número de autores
3
Número de autores del IAC
2
Número de citas
8
Número de citas referidas
8
Descripción
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.
Proyectos relacionados
Miembros del grupo
Huellas de la Formación de las Galaxias: Poblaciones estelares, Dinámica y Morfología
Bienvenida a la página web del g rupo de investigación Traces of Galaxy Formation. Somos un grupo de investigación amplio, diverso y muy activo cuyo objetivo principal es entender la formación de galaxias en el Universo de una manera lo más completa posible. Con el estudio detellado de las poblaciones estelares como bandera, estamos constantemente
Anna
Ferré Mateu
En ejecución
Tipo
Con árbitro
Galaxias

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