The Globular Cluster System of NGC 1395: combining optical and near infrared photometry

CHIES SANTOS, A.; SMITH CASTELLI, A. V.; MENDES DE OLIVEIRA, C.; FORTE, J. C.; ESCUDERO, C. G.; CORTESI, A.; SESTO, L. A.; FAIFER, F. R.

San Francisco

Congreso; Science and Evolution of Gemini Observatory 2018; 2018

Observatorio Internacional Gemini

 In the framework of our BAGGs collaboration, we are involved in obtaining deep optical and NIR photometry, as well as deep MOS spectroscopy, of GC systems belonging to massive early-type galaxies. Combined with different SSP models, these data will help to mitigate the age-metallicity degeneracy and will allow us to measure several color-indices less sensitive to the effect of horizontal-branch stars. By combining kinematics and color-metallicity measurements of GC systems in a self-consistent manner, we recover the evolutionary histories of the galaxies and shed light in the assembly history of the halos of the galaxies. As a firts step of BAGGs? observing campaign, we observed the GC system of the giant elliptical galaxy NGC 1395 (D ∼21.4 Mpc, M B=-21.02 mag), one of the dominant galaxies of the Eridanus group.This galaxy harbours thousands of GCs and show different GCs subpopulations in their optical color distributions (Escudero+ 2018). Here we are presenting our first results, based on deep and high quality NIR photometric data in two different photometric bands (J and Ks) obtained with GEMINI+Flamingos2 instrument which were combined with high quality optical photometry from previous GEMINI+GMOS runs.