2020MNRAS.495.2247J

Query : 2020MNRAS.495.2247J

2020MNRAS.495.2247J - Mon. Not. R. Astron. Soc., 495, 2247-2264 (2020/June-3)

The Next Generation Fornax Survey (NGFS): VII. A MUSE view of the nuclear star clusters in Fornax dwarf galaxies.

JOHNSTON E.J., PUZIA T.H., D'AGO G., EIGENTHALER P., GALAZ G., HAUSSLER B., MORA M.D., ORDENES-BRICENO Y., RONG Y., SPENGLER C., VOGT F., COTE P., GREBEL E.K., HILKER M., MIESKE S., MILLER B., SANCHEZ-JANSSEN R., TAYLOR M.A. and ZHANG H.-X.

Abstract (from CDS):

Clues to the formation and evolution of nuclear star clusters (NSCs) lie in their stellar populations. However, these structures are often very faint compared to their host galaxy, and spectroscopic analysis of NSCs is hampered by contamination of light from the rest of the system. With the introduction of wide-field integral field unit (IFU) spectrographs, new techniques have been developed to model the light from different components within galaxies, making it possible to cleanly extract the spectra of the NSCs and study their properties with minimal contamination from the light of the rest of the galaxy. This work presents the analysis of the NSCs in a sample of 12 dwarf galaxies in the Fornax Cluster observed with the Multi-Unit Spectroscopic Explorer (MUSE). Analysis of the stellar populations and star formation histories reveal that all the NSCs show evidence of multiple episodes of star formation, indicating that they have built up their mass further since their initial formation. The NSCs were found to have systematically lower metallicities than their host galaxies, which is consistent with a scenario for mass assembly through mergers with infalling globular clusters, whilst the presence of younger stellar populations and gas emission in the core of two galaxies is indicative of in-situ star formation. We conclude that the NSCs in these dwarf galaxies likely originated as globular clusters that migrated to the core of the galaxy that have built up their mass mainly through mergers with other infalling clusters, with gas-inflow leading to in-situ star formation playing a secondary role.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: nuclei - galaxies: star formation

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1336 GiG 03 26 32.1845365512 -35 42 48.662672184   13.12   11.95   ~ 150 0
2 MCG-06-09-008 GiP 03 36 54.3158470008 -35 22 28.948080864   14.81       ~ 105 2
3 6dFGS gJ033704.6-353524 GiC 03 37 04.66 -35 35 24.0   15.94   15.65   ~ 51 0
4 NGC 1396 GiG 03 38 06.5677454520 -35 26 23.637846372   14.80       ~ 105 1
5 LEDA 648051 GiC 03 38 16.67 -35 30 27.9   17.4 16.84     ~ 20 0
6 LEDA 74808 EmG 03 38 19.265 -35 07 44.74   15.60 15.34     ~ 65 0
7 LEDA 74811 EmG 03 38 21.4890668040 -35 15 34.953195492   15.89 15.65     ~ 42 0
8 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
9 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
10 LEDA 74817 LSB 03 38 37.7 -35 45 27   19.2 19.21     ~ 33 1
11 LEDA 13449 GiC 03 39 13.42 -35 22 15.7   15.1 14.91     ~ 68 1
12 LEDA 13452 GiC 03 39 19.60 -35 43 29.0   16.10 15.89     ~ 49 1
13 LEDA 74850 LSB 03 39 50.1 -35 31 22   19.3       ~ 28 1
14 LEDA 74879 GiC 03 40 33.86 -35 01 21.4   15.73   15.54   ~ 46 0
15 6dFGS gJ034545.4-362046 GiC 03 45 45.40 -36 20 47.5   16.01   15.11   ~ 40 0
16 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
17 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
18 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
19 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2

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