2018ApJ...860....4O

Query : 2018ApJ...860....4O

2018ApJ...860....4O - Astrophys. J., 860, 4-4 (2018/June-2)

The Next Generation Fornax Survey (NGFS). IV. Mass and age bimodality of nuclear clusters in the Fornax core region.

ORDENES-BRICENO Y., PUZIA T.H., EIGENTHALER P., TAYLOR M.A., MUNOZ R.P., ZHANG H., ALAMO-MARTINEZ K., RIBBECK K.X., GREBEL E.K., ANGEL S., COTE P., FERRARESE L., HILKER M., LANCON A., MIESKE S., MILLER B.W., RONG Y. and SANCHEZ-JANSSEN R.

Abstract (from CDS):

We present the analysis of 61 nucleated dwarf galaxies in the central regions (<=Rvir/4) of the Fornax galaxy cluster. The galaxies and their nuclei are studied as part of the Next Generation Fornax Survey using optical imaging obtained with the Dark Energy Camera mounted at Blanco/Cerro Tololo Inter-American Observatory and near-infrared data obtained with VIRCam at VISTA/ESO. We decompose the nucleated dwarfs in nucleus and spheroid, after subtracting the surface brightness profile of the spheroid component and studying the nucleus using point source photometry. In general, nuclei are consistent with colors of confirmed metal-poor globular clusters, but with significantly smaller dispersion than other confirmed compact stellar systems in Fornax. We find a bimodal nucleus mass distribution with peaks located at log( M*/M☉)≃5.4 and ∼6.3. These two nucleus subpopulations have different stellar population properties: the more massive nuclei are older than ∼2 Gyr and have metal-poor stellar populations (Z <= 0.02 Z☉), while the less massive nuclei are younger than ∼2 Gyr with metallicities in the range 0.02 < Z/Z☉ <= 1. We find that the nucleus mass ( Mnuc) versus galaxy mass ( Mgal) relation becomes shallower for less massive galaxies starting around 108 M☉, and the mass ratio ηn= Mnuc/ Mgal shows a clear anticorrelation with Mgal for the lowest masses, reaching 10%. We test current theoretical models of nuclear cluster formation and find that they cannot fully reproduce the observed trends. A likely mixture of in situ star formation and star cluster mergers seems to be acting during nucleus growth over cosmic time.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: individual: Fornax - galaxies: dwarf - galaxies: nuclei

VizieR on-line data: <Available at CDS (J/ApJ/860/4): table1.dat>

Simbad objects: 71

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Number of rows : 71
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 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
2 NGC 404 LIN 01 09 27.02 +35 43 05.3   12.56 11.73     ~ 511 0
3 FDS 16 0145 LSB 03 33 22.2 -35 36 20           ~ 10 0
4 FDS 16 0127 LSB 03 33 32.2 -35 39 42           ~ 12 0
5 NGFS J033346-353455 G 03 33 45.965 -35 34 55.30           ~ 2 0
6 LEDA 74735 LSB 03 34 12.2 -35 13 43   20.3       ~ 19 0
7 LEDA 74737 LSB 03 34 20.2 -35 21 45   17.5       ~ 23 0
8 MCG-06-08-027 EmG 03 34 29.4927803424 -35 32 47.329271916   14.50       ~ 95 1
9 LEDA 13242 LSB 03 34 44.2 -35 51 41   16.9       ~ 24 0
10 NGFS J033446-345334 LSB 03 34 46.056 -34 53 33.57           ~ 5 0
11 FDS 16 0170 LSB 03 34 52.7 -35 34 10           ~ 11 0
12 LEDA 74742 LSB 03 34 56.5 -35 11 27   19.0 18.25     ~ 22 0
13 LEDA 74744 LSB 03 34 58.2 -35 02 34   18.5       ~ 21 0
14 LEDA 74749 LSB 03 35 11.5 -35 19 22   19.5       ~ 24 0
15 2MASX J03352407-3621496 GiC 03 35 24.0910651464 -36 21 49.743672768   15.90       ~ 38 0
16 LEDA 74753 LSB 03 35 25.2 -36 10 44   18.0       ~ 17 0
17 LEDA 74757 LSB 03 35 42.8 -35 30 51   18.3 18.85     ~ 19 0
18 LEDA 13291 LSB 03 35 46.3 -35 59 21   16.8       ~ 22 0
19 LEDA 74761 LSB 03 36 03.94 -35 23 20.5   17.7 17.34     ~ 27 1
20 LEDA 74768 LSB 03 36 23.5 -35 54 41   17.5       ~ 19 0
21 LEDA 74770 LSB 03 36 28.0 -35 12 39   18.7 18.78     ~ 22 0
22 FDS 12 0236 G 03 36 32.2 -36 25 37           ~ 7 0
23 FCC 171 LSB 03 36 37.252 -35 23 09.33           ~ 28 2
24 LEDA 74781 GiC 03 36 53.21 -34 56 17.3   16.93       ~ 30 0
25 NGFS J033657-355011 LSB 03 36 57.103 -35 50 11.45           ~ 5 0
26 FDS 11 0306 LSB 03 36 59.8 -35 20 36           ~ 14 1
27 NGFS J033700-350816 LSB 03 36 59.856 -35 08 15.72           ~ 11 0
28 FDS 11 0064 LSB 03 37 03.4 -35 48 03           ~ 12 0
29 LEDA 74786 GiC 03 37 08.2 -34 43 52   18.8       ~ 20 0
30 LEDA 74787 LSB 03 37 10.0 -35 23 11   19.3       ~ 24 0
31 LEDA 74788 LSB 03 37 10.3 -35 53 18   19.6 19.70     ~ 17 0
32 LEDA 74790 LSB 03 37 17.98 -35 41 54.8   18.2 17.80     ~ 25 1
33 FDS 12 0492 LSB 03 37 27.5 -35 57 46           ~ 12 0
34 LEDA 74792 LSB 03 37 34.05 -35 49 45.8   17.7       ~ 29 0
35 FDS 10 0143 G 03 37 42.0 -34 38 16           ~ 5 0
36 NGC 1396 GiG 03 38 06.5677454520 -35 26 23.637846372   14.80       ~ 105 1
37 LEDA 648051 GiC 03 38 16.67 -35 30 27.9   17.4 16.84     ~ 20 0
38 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
39 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
40 LEDA 74816 LSB 03 38 36.6 -35 50 02   19.0 18.91     ~ 24 0
41 FDS 11 0013 LSB 03 38 37.2 -35 55 02           ~ 9 0
42 LEDA 74817 LSB 03 38 37.7 -35 45 27   19.2 19.21     ~ 33 1
43 LEDA 74821 LSB 03 38 45.336 -35 15 59.93   18.5       ~ 21 0
44 FDS 10 0056 LSB 03 38 54.3 -34 49 32           ~ 12 0
45 LEDA 74832 GiC 03 39 05.78 -36 05 55.2   17.7       ~ 20 0
46 LEDA 13449 GiC 03 39 13.42 -35 22 15.7   15.1 14.91     ~ 68 1
47 LEDA 13452 GiC 03 39 19.60 -35 43 29.0   16.10 15.89     ~ 49 1
48 LEDA 74850 LSB 03 39 50.1 -35 31 22   19.3       ~ 28 1
49 LEDA 74856 LSB 03 39 55.4 -35 39 44   19.1 18.75     ~ 25 0
50 NGFS J033956-353721 LSB 03 39 56.422 -35 37 20.51           ~ 9 1
51 FDS 10 0109 LSB 03 40 00.6 -34 43 23           ~ 9 0
52 LEDA 74864 LSB 03 40 09.8 -35 50 10   19.2       ~ 18 0
53 FDS 12 0296 LSB 03 40 19.3 -36 18 50           ~ 11 0
54 LEDA 13515 LSB 03 40 23.41 -35 16 32.8   16.20       ~ 40 2
55 LEDA 74873 GiC 03 40 27.0207791448 -36 29 56.047672320   16.5       ~ 27 0
56 LEDA 74877 LSB 03 40 30.70 -35 52 41.0   18.2       ~ 20 0
57 LEDA 74879 GiC 03 40 33.86 -35 01 21.4   15.73   15.54   ~ 46 0
58 LEDA 74882 LSB 03 40 37.7 -36 07 16   19.1       ~ 23 0
59 FDS 12 0366 LSB 03 40 44.0 -36 11 07           ~ 13 0
60 2MASX J03405042-3544534 GiC 03 40 50.4165381120 -35 44 54.385434708   15.74       ~ 42 0
61 LEDA 74899 LSB 03 41 00.77 -35 44 31.1   17.6       ~ 36 0
62 LEDA 74905 LSB 03 41 07.3 -35 30 52   17.8       ~ 21 1
63 LEDA 13560 LSB 03 41 12.79 -35 09 29.8   17.0       ~ 27 1
64 LEDA 648899 G 03 41 35.0 -35 26 24           ~ 9 0
65 LEDA 74933 GiC 03 42 17.2756218024 -35 32 26.556690480   16.26 16.31     ~ 41 0
66 NGFS J034218-352819 G 03 42 17.822 -35 28 18.93           ~ 4 0
67 FDS 6 0201 LSB 03 42 25.2 -35 35 42           ~ 9 0
68 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
69 NGC 5102 EmG 13 21 57.6100832352 -36 37 48.395156160   9.74 9.65 8.47 10.2 ~ 389 1
70 NGC 5206 GiG 13 33 43.9615937880 -48 09 03.953598228   11.62   10.40   ~ 121 0
71 NAME Local Group GrG ~ ~           ~ 9325 0

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