The globular cluster system of the galaxy NGC 4546: clues about the origin of S0 galaxies.

ESCUDERO, CARLOS G.; FAIFER, FAVIO R.; NORRIS, MARK A.; FORTE, JUAN C.

Toronto

Congreso; Future & Science of Gemini Observatory; 2015

Gemini Observatory

Based in GMOS images, we present the first photometric caracterization of the globular cluster system (GCS) of NGC4546. This lenticular galaxy, located in low density environment, poses a challenge in understanding of their origin and evolution. We also present radial velocities measurements, metallicities, [alfa/Fe] abundance ratios and ages of a sample of GCs and a ultra-compact dwarf (UCD) associated with the galaxy. Through measured Lick indices in the obtained spectra, we found that most of the measured GCs have ages higher than 10 Gy, with metallicities ranging from [Z/H]=-2 to 0.45, and alpha-element abundances consistent with a value of [alpha/Fe]~0.2. The UCD look young and metal rich. In this context, the presence of two GCs young, would indicate that they may have formed in the same merger event that formed the UCD.