2020A&A...634A..53F


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET13:41:02

2020A&A...634A..53F - Astronomy and Astrophysics, volume 634A, 53-53 (2020/2-1)

Metal-poor nuclear star clusters in two dwarf galaxies near Centaurus A suggesting formation from the in-spiraling of globular clusters.

FAHRION K., MULLER O., REJKUBA M., HILKER M., LYUBENOVA M., VAN DE VEN G., GEORGIEV I.Y., LELLI F., PAWLOWSKI M.S. and JERJEN H.

Abstract (from CDS):

Studies of nucleated dwarf galaxies can constrain the scenarios for the formation and evolution of nuclear star clusters (NSC) in low-mass galaxies and give us insights on the origin of ultra compact dwarf galaxies (UCDs). We report the discovery of a NSC in the dwarf galaxy KKs58 and investigate its properties together with those of another NSC in KK197. Both NSCs are hosted by dwarf elliptical galaxies of the Centaurus group. Combining ESO VLT MUSE data with photometry from VLT FORS2, CTIO Blanco DECam, and HST ACS, as well as high-resolution spectroscopy from VLT UVES, we analyse the photometric, kinematic and stellar population properties of the NSCs and their host galaxies. We confirm membership of the NSCs based on their radial velocities and location close to the galaxy centres. We also confirm the membership of two globular clusters (GCs) and detect oblate rotation in the main body of KK197. Based on high signal-to-noise spectra taken with MUSE of the NSCs of both KKs58 and KK197 we measure low metallicities, [Fe/H]=-1.75±0.06dex and [Fe/H]=-1.84±0.05dex, and stellar masses of 7.3x105M and 1.0x106M, respectively. Both NSCs are more metal-poor than their hosts that have metallicities of -1.35±0.23dex (KKs58) and -0.84±0.12dex (KK197). This can be interpreted as NSC formation via the in-spiral of GCs. The masses, sizes and metallicities of the two NSCs place them among other NSCs, but also among the known UCDs of the Centaurus group. This indicates that NSCs might constitute the progenitors of a part of the low-mass UCDs, although their properties are almost indistinguishable from typical GCs.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: kinematics and dynamics - galaxies: dwarf - galaxies: star clusters: general

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1498 1
2 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1574 0
3 ESO 59-1 G 07 31 18.2 -68 11 16   13.74   12.80 13.7 ~ 61 1
4 NGC 3201 GlC 10 17 36.82 -46 24 44.9   9.18 8.24     ~ 736 0
5 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5931 0
6 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6301 3
7 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 985 2
8 ESO 219-10 G 12 56 09.6 -50 08 38   16.96   15.36   ~ 20 0
9 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4288 2
10 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 723 0
11 ESO 269-66 GiC 13 13 09.2 -44 53 23   14.14       ~ 52 0
12 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 233 0
13 [GPH2009] KK197-01 Gl? 13 21 59.81 -42 32 06.5           ~ 2 0
14 [GPH2009] KK197-02 Gl? 13 22 02.0550782058 -42 32 07.286291297           ~ 2 0
15 LEDA 46680 G 13 22 02.1 -42 32 10   16.6       ~ 44 0
16 [GPH2009] KK197-03 Gl? 13 22 02.53 -42 32 13.8           ~ 2 0
17 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4042 3
18 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3040 0
19 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2258 2
20 LEDA 2815824 G 13 46 01.0 -36 19 41   17.1       ~ 14 0
21 ESO 223-9 G 15 01 08.4 -48 17 33   12.3   12.5 12.6 ~ 69 0
22 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1788 2
23 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 918 0
24 NAME Local Group GrG ~ ~           ~ 7115 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-13:41:02

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