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2012MNRAS.427..850M - Mon. Not. R. Astron. Soc., 427, 850-858 (2012/November-3)
Intergalactic stellar populations in intermediate redshift clusters.
MELNICK J., GIRAUD E., TOLEDO I., SELMAN F. and QUINTANA H.
Abstract (from CDS):
In this paper we show that by stacking spectra at different locations within the ICL it is possible to reach sufficiently high signal-to-noise ratios to fit population synthesis models and derive meaningful results. The models provide ages and metallicities for the dominant populations at several different locations within the ICL and the brightest cluster galaxies (BCG) halo, as well as measures of the kinematics of the stars as a function of distance from the BCG. We thus find that the ICL in our cluster is dominated by old metal-rich stars, at odds with what has been found in nearby clusters where the stars that dominate the ICL are old and metal poor. While we see weak evidence of a young, metal-poor component, if real, these young stars would amount to less than 1 per cent of the total ICL mass, much less than the up to 30 per cent predicted by the models.
We propose that the very metal-rich (i.e. 2.5 x solar) stars in the ICL of our cluster, which comprise ∼ 40 per cent of the total mass, originate mostly from the central dumb-bell galaxy, while the remaining solar and metal-poor stars come from spiral, post-starburst (E+A) and metal-poor dwarf galaxies. About 16 per cent of the ICL stars are old and metal poor.
Abstract Copyright: © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Journal keyword(s): galaxies: abundances - galaxies: intracluster medium - galaxies: formation - galaxies: interactions - galaxies: stellar content
Simbad objects: 8
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