Astrophysics
[Submitted on 9 Mar 2000]
Title:Homogeneity of Stellar Populations in Early-Type Galaxies with Different X-ray Properties
View PDFAbstract: 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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