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Superdense massive galaxies in the nearby universe

Published online by Cambridge University Press:  13 April 2010

Anna Ferré-Mateu  and
Ignacio Trujillo
Anna Ferré-Mateu
Affiliation:
Instituo Astrofísica de Canarias, Tenerife c/Via Láctea s/n E38205, Tenerife, Spain email: [email protected]
Ignacio Trujillo
Affiliation:
Instituo Astrofísica de Canarias, Tenerife c/Via Láctea s/n E38205, Tenerife, Spain email: [email protected]
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Abstract

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At high-z the most superdense massive galaxies are supposed to be the result of gas-rich mergers resulting in compact remnant (Khochfar & Silk (2006); Naab et al. (2007)). After this, dry mergers are expected to be the mechanism that moves these very massive galaxies towards the current stellar mass size relation. Whitin these merging scenarios, a non-negligible fraction (1-10%) of these galaxies is expected to survive since that epoch retaining their compactness and presenting old stellar populations in the past universe.Using the NYU Value-Added Galaxy Catalog (DR6), we find only a tiny fraction of galaxies (~0.03%) with re ≤ 1.5 kpc and M* ≥ 8x1010M⊙ in the local Universe (z~0.2). Surprisingly, they are relatively young (~2Gyr) and metal rich ([Z/H]~0.2) These results have been published in Trujillo et al. (2009)

Keywords

galaxies: evolutionformationstellar content
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 331 - 332
Copyright
Copyright © International Astronomical Union 2010

References

Hopkins, P. et al. 2009, ApJ, 691, 1424CrossRefGoogle Scholar
Khochfar, S. & Silk, J. 2006, ApJ, 648, L21CrossRefGoogle Scholar
Naab, T. et al. 2007, ApJ,658, 710CrossRefGoogle Scholar
Trujillo, I. et al. 2009, ApJ,692, L118CrossRefGoogle Scholar