In this paper, we describe a new method to select globular cluster (GC) candidates, including galaxy subtraction with unsharp masking, template fitting techniques and the inclusion of Gaia's proper motions. We report the use of the 12-band photometric system of S-PLUS to determine radial velocities and stellar populations of GCs around nearby galaxies. Specifically, we assess the effectiveness of identifying GCs around nearby and massive galaxies (D <20 Mpc and σ>200 km/s) in a multi-band survey such as S-PLUS by using spectroscopically confirmed GCs and literature GC candidate lists around the bright central galaxy in the Fornax cluster, NGC 1399 (D = 19 Mpc), and the isolated lenticular galaxy NGC 3115 (D = 9.4 Mpc). Despite the shallow survey depth, that limits the present work to r<21.3 mag, we measure reliable photometry and perform robust SED fitting for a sample of 115 GCs around NGC 1399 and 42 GCs around NGC 3115, recovering radial velocities, ages, and metallicities for the GC populations.
@article{arxiv.2111.14993,
title = {A new method to detect globular clusters with the S-PLUS survey},
author = {Maria Luísa Buzzo and Arianna Cortesi and Duncan A. Forbes and Jean P. Brodie and Warrick J. Couch and Carlos Eduardo Barbosa and Danielle de Brito Silva and Paula Coelho and Ana L. Chies-Santos and Carlos Escudero and Leandro Sesto and Karín Menéndez-Delmestre and Thiago S. Golçalves and Clécio R. Bom and Alvaro Alvarez-Candal and Analía V. Smith Castelli and William Schoenell and Antonio Kanaan and Tiago Ribeirto and Claudia Mendes de Oliveira},
journal= {arXiv preprint arXiv:2111.14993},
year = {2021}
}
Comments
Accepted for publication in MNRAS. 11 pages, 5 figures, 2 tables