info:eu-repo/semantics/article
Wide-field study of the peculiar globular cluster system hosted by the field lenticular NGC 1172
Fecha
2020-12Registro en:
Ennis, Ana Inés; Caso, Juan Pablo; Bassino, Lilia Patricia; Salinas, Ricardo; Gómez, Matías; Wide-field study of the peculiar globular cluster system hosted by the field lenticular NGC 1172; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 499; 2; 12-2020; 2554-2563
0035-8711
1365-2966
CONICET Digital
CONICET
Autor
Ennis, Ana Inés
Caso, Juan Pablo
Bassino, Lilia Patricia
Salinas, Ricardo
Gómez, Matías
Resumen
We present a wide-field study of the globular cluster system (GCS) of the field lenticular galaxy NGC 1172, 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 (SN = 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 NGC 1172 having accreted a significant amount of GCs from low-mass satellites in the past.