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Truncated star formation in dwarf spheroidal galaxies and photometric scaling relations

Published online by Cambridge University Press:  01 June 2008

Sven De Rijcke ,
Sander Valcke ,
Christopher J. Conselice  and
Samantha Penny
Sven De Rijcke
Affiliation:
Sterrenkundig Observatorium, University of Ghent, Krijgslaan 281, S9, B-9000 Gent, Belgium email: [email protected], [email protected]
Sander Valcke
Affiliation:
Sterrenkundig Observatorium, University of Ghent, Krijgslaan 281, S9, B-9000 Gent, Belgium email: [email protected], [email protected]
Christopher J. Conselice
Affiliation:
School of Physics and Astronomy, University of Nottingham, University Park, NG9 2RD, UK email: [email protected], [email protected]
Samantha Penny
Affiliation:
School of Physics and Astronomy, University of Nottingham, University Park, NG9 2RD, UK email: [email protected], [email protected]
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Abstract

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We investigate the global photometric scaling relations traced by early-type galaxies in different environments, ranging from dwarf spheroidals, over dwarf elliptical galaxies, up to giant ellipticals (−8 mag ≳ MV ≳ −24 mag). These results are based in part on our new HST/ACS F555W and F814W imagery of dwarf spheroidal galaxies in the Perseus Cluster. We show that at MV ~ −14 mag, the slopes of the photometric scaling relations involving the Sérsic parameters change significantly. We argue that these changes in slope reflect the different physical processes that dominate the evolution of early-type galaxies in different mass regimes. We present N-body/SPH simulations of the formation and evolution of dwarf spheroidals that reproduce these slope changes and discuss the underlying physics. As such, these scaling relations contain a wealth of information that can be used to test models for the formation of early-type galaxies.

Keywords

galaxies: dwarfgalaxies: photometrygalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies , June 2008 , pp. 318 - 322
Copyright
Copyright © International Astronomical Union 2008

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