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On the connection between shape and stellar population in early-type galaxies

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arxiv 1010.4174 v1 pith:GCMHCK36 submitted 2010-10-20 astro-ph.CO

On the connection between shape and stellar population in early-type galaxies

classification astro-ph.CO
keywords stellarshapeearly-typeetgsgalaxiesgalaxypopulationrelation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on the discovery of a relation between the stellar mass $M^*$ of early-type galaxies (hereafter ETGs), their shape, as parametrized by the Sersic index $n$, and their stellar mass-to-light ratio $M^*/L$. In a 3D log space defined by these variables the ETGs populate a plane surface with small scatter. This relation tells us that galaxy shape and stellar population are not independent physical variables, a result that must be accounted for by theories of galaxy formation and evolution.

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