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

Abstract

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.

6 pages, 5 figures, accepted for publication in ApJ

References in corpus (2)

• A High Merger Fraction in the Rich Cluster MS1054-03 at z=0.83: Direct Evidence for Hierarchical Formation of Massive Galaxies
• On the Formation of Boxy and Disky Elliptical Galaxies

Cited by in corpus (6)

• Scaling Mass Profiles around Elliptical Galaxies Observed with Chandra and XMM-Newton
• Origin of the scatter in the X-ray luminosity of early-type galaxies observed with ROSAT
• Self-Regulated AGN Heating in Elliptical Galaxies
• A Galaxy Merger Scenario for the NGC 1550 Galaxy from Metal Distributions in the X-ray Emitting Plasma
• The Impact of High Pressure Cluster Environment on the X-ray Luminosity of Coma Early-type Galaxies
• On Toda Equation and Half BPS Supergravity Solution in M-Theory