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2010MNRAS.408...97K - Mon. Not. R. Astron. Soc., 408, 97-132 (2010/October-2)
The SAURON project - XVII. Stellar population analysis of the absorption line strength maps of 48 early-type galaxies.
KUNTSCHNER H., EMSELLEM E., BACON R., CAPPELLARI M., DAVIES R.L., DE ZEEUW P.T., FALCON-BARROSO J., KRAJNOVIC D., McDERMID R.M., PELETIER R.F., SARZI M., SHAPIRO K.L., VAN DEN BOSCH R.C.E. and VAN DE VEN G.
Abstract (from CDS):
The flattened components with disc-like kinematics previously identified in all fast rotators are shown to be connected to regions of distinct stellar populations. These range from the young, still star-forming circumnuclear discs and rings with increased metallicity preferentially found in intermediate-mass fast rotators, to apparently old structures with extended disc-like kinematics, which are observed to have an increased metallicity and mildly depressed [α/Fe] ratio compared to the main body of the galaxy. The slow rotators, often harbouring kinematically decoupled components (KDC) in their central regions, generally show no stellar population signatures over and above the well-known metallicity gradients in early-type galaxies and are largely consistent with old (≥10Gyr) stellar populations.
Using radially averaged stellar population gradients we find in agreement with Spolaor et al. a mass-metallicity gradient relation where low-mass fast rotators form a sequence of increasing metallicity gradient with increasing mass. For more massive systems (above ∼3.5x1010M☉) there is an overall downturn such that metallicity gradients become shallower with increased scatter at a given mass leading to the most massive systems being slow rotators with relatively shallow metallicity gradients. The observed shallower metallicity gradients and increased scatter could be a consequence of the competition between different star formation and assembly scenarios following a general trend of diminishing gas fractions and more equal-mass mergers with increasing mass, leading to the most massive systems being devoid of ordered motion and signs of recent star formation.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): galaxies: bulges - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: kinematics and dynamics - galaxies: nuclei
Simbad objects: 50
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