Wide-field study of the peculiar globular cluster system hosted by the field lenticular NGC 1172

Ines Ennis, Ana; Pablo Caso, Juan; Bassino, Lilia P.; Salinas, Ricardo; Gomez, Matias

Abstract

We present awide-field study of the globular cluster system (GCS) of the field lenticular galaxy NGC1172, based on observations from Gemini Multi-Object Spectrograph/Gemini (optical), FourStar/Magellan (NIR), and archival data from ACS/Hubble Space Telescope (optical). This analysis covers the full extension of the GCS, and results in a value of specific frequency (S-N = 8.6 +/- 1.5) peculiarly high for an intermediate-mass galaxy in a low-density environment such as this one. We find that the GCS appears to be bimodal, although the colour distribution is narrow and does not allow for an accurate separation of the subpopulations. However, the combination of optical and NIR filters allows us to obtain an estimation of the metallicity distribution based on the photometry, which supports bimodality. We conclude that the presence of a large fraction of metal-poor globular clusters (GCs) and the high specific frequency point to NGC1172 having accreted a significant amount of GCs from low-mass satellites in the past.

Más información

Título según WOS: Wide-field study of the peculiar globular cluster system hosted by the field lenticular NGC 1172
Título de la Revista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volumen: 499
Número: 2
Editorial: Oxford Academic
Fecha de publicación: 2020
Página de inicio: 2554
Página final: 2563
DOI:

10.1093/MNRAS/STAA2967

Notas: ISI