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2011MNRAS.414..642C - Mon. Not. R. Astron. Soc., 414, 642-651 (2011/June-2)
Unravelling the origins of S0 galaxies using maximum likelihood analysis of planetary nebulae kinematics.
CORTESI A., MERRIFIELD M.R., ARNABOLDI M., GERHARD O., MARTINEZ-VALPUESTA I., SAHA K., COCCATO L., BAMFORD S., NAPOLITANO N.R., DAS P., DOUGLAS N.G., ROMANOWSKY A.J., KUIJKEN K., CAPACCIOLI M. and FREEMAN K.C.
Abstract (from CDS):
The method is first tested on an N-body simulated galaxy to assess possible sources of systematic error associated with the structural and kinematic decomposition, which are found to be small. It is then applied to the S0 system NGC 1023, for which a planetary nebula catalogue has already been released and analysed by Noordermer et al. The correct inclusion of the spheroidal component allows us to show that, contrary to previous claims, the stellar kinematics of this galaxy are indistinguishable from those of a normal spiral galaxy, indicating that it may have evolved directly from such a system via gas stripping or secular evolution. The method also successfully identifies a population of outliers whose kinematics are different from those of the main galaxy; these objects can be identified with a stellar stream associated with the companion galaxy NGC 1023A.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: evolution - galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 1023 - galaxies: individual: NGC 1023A - galaxies: kinematics and dynamics
Simbad objects: 2
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