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

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

2010-10-20

arxiv.org/abs/1010.4174v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 2 figures. Accepted on ApJL

Scientific paper

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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