What do the Lick indices tell us about the Virgo and Coma clusters?

SCALIA, M. C.; SMITH CASTELLI, A. V.; FAIFER, F.

La Serena

Congreso; Galaxies Groups and Clusters III: Laboratories to study galaxy evolution; 2023

Universidad de La Serena, Universidad de Talca y NoirLab

The analysis of the behavior of the Lick indices of the Virgo and Coma clusters is presented here. These 25 indices are known to be a widely used tool for the calculation of ages, metallicities and abundances of chemical elements, when compared with simple stellar population models. Moreover, each of them is associated with a spectral feature in which a certain chemical species predominates. In previous work, we have found that, in both the Virgo and Coma clusters, there seems to be a certain degree of dependence of color (g-z) on some of the aforementioned indices. We wonder if the detection of such dependencies would indicate that they originate from environmental effects. To answer this question, we analyze the behavior of these indices along the color-magnitude relation and in the cluster structures inside and outside the virial radius.