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GALEX-derived Residual Star Formation History of Elliptical Galaxies

Published online by Cambridge University Press:  21 April 2007

E. Emsellem ,
H. Wozniak ,
G. Massacrier ,
J.-F. Gonzalez ,
J. Devriendt ,
N. Champavert ,
S.K. Yi ,
S. Kaviraj ,
K. Schawinski  and
S. Khochfar
S.K. Yi
Affiliation:
Yonsei University, Department of Astronomy, Seoul, South Korea
S. Kaviraj
Affiliation:
University of Oxford, Astrophysics, Oxford, UK
K. Schawinski
Affiliation:
University of Oxford, Astrophysics, Oxford, UK
S. Khochfar
Affiliation:
University of Oxford, Astrophysics, Oxford, UK
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Abstract

Bright early-type galaxies are still forming stars at low-level residualstar formation (RSF) mode.The GALEX UV satellite has detected excessive UV flux in >30% of our volume-limited sample of ~ 103 galaxies. The RSF galaxy fractionis higher among the dynamically low-mass sample (RSF-σ relation).We postulate that this is a result of a “critical”MBH − σ relation that regulates residual star formation activities inearly type galaxies. Implications are discussed.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 24: CRAL-2006. Chemodynamics: From First Stars to Local Galaxies , 2007 , pp. 73 - 76
Copyright
© EAS, EDP Sciences, 2007

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