Homogeneity of Stellar Populations in Early-Type Galaxies with Different X-ray Properties

Details Homogeneity of Stellar Populations in Early-Type Galaxies with Different X-ray Properties Homogeneity of Stellar Populations in Early-Type Galaxies with Different X-ray Properties

2000-03-09

arxiv.org/abs/astro-ph/0003136v1

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, accepted for publication in ApJ

Scientific paper

10.1086/309231

We have found the stellar populations of early-type galaxies are homogeneous with no significant difference in color or Mg2 index, despite the dichotomy between X-ray extended early-type galaxies and X-ray compact ones. Since the X-ray properties reflect the potential gravitational structure and hence the process of galaxy formation, the homogeneity of the stellar populations implies that the formation of stars in early-type galaxies predat es the epoch when the dichotomy of the potential structure was established.

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