The complex globular cluster system of the S0 galaxy NGC 4382 in the outskirts of the Virgo Cluster
Abstract
NGC 4382 is a merger-remnant galaxy that has been classified as morphological type E2, S0, and even Sa. In this work, we performed a photometric and spectroscopic analysis of the globular cluster (GC) system of this peculiar galaxy in order to provide additional information about its history. We used a combination of photometric data in different filters, and multiobject and long-slit spectroscopic data obtained using the Gemini/GMOS instrument. The photometric analysis of the GC system, using the Gaussian Mixture Model algorithm in the colour plane, reveals a complex colour distribution within Rgal < 5 arcmin (26.1 kpc), showing four different groups: the typical blue and red subpopulations, a group with intermediate colours, and the fourth group towards even redder colours. From the spectroscopic analysis of 47 GCs, confirmed members of NGC 4382 based on radial velocities, we verified 3 of the 4 photometric groups from the analysis of their stellar populations using the ULySS code. NGC 4382 presents the classic blue (10.4 ± 2.8 Gyr, [Fe/H] = -1.48 ± 0.18 dex), and red (12.1 ± 2.3 Gyr, [Fe/H] = -0.64 ± 0.26 dex) GCs formed earlier in the lifetime of the galaxy, and a third group of young GCs (2.2 ± 0.9 Gyr; [Fe/H] = -0.05 ± 0.28 dex). Finally, analysis of long-slit data of the galaxy reveals a luminosity-weighted mean age for the stellar population of ~2.7 Gyr, and an increasing metallicity from [Fe/H] = -0.1 to +0.2 dex in Rgal < 10 arcsec (0.87 kpc). These values, and other morphological signatures in the galaxy, are in good agreement with the younger group of GCs, indicating a common origin as a result of a recent merger.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- March 2022
- DOI:
- 10.1093/mnras/stac021
- arXiv:
- arXiv:2201.01759
- Bibcode:
- 2022MNRAS.511..393E
- Keywords:
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- galaxies: clusters: individual: NGC 4382;
- galaxies: elliptical and lenticular;
- cD;
- galaxies: star clusters: general;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 20 pages, 24 figures. Accepted to be published in MNRAS