CDS

2011A&A...531A...4M

Query : 2011A&A...531A...4M

2011A&A...531A...4M - Astronomy and Astrophysics, volume 531A, 4-4 (2011/7-1)

A large population of ultra-compact dwarf galaxies in the Hydra I cluster.

MISGELD I., MIESKE S., HILKER M., RICHTLER T., GEORGIEV I.Y. and SCHUBERTH Y.

Abstract (from CDS):

We performed a large spectroscopic survey of compact, unresolved objects in the core of the Hydra I galaxy cluster (Abell 1060), with the aim of identifying ultra-compact dwarf galaxies (UCDs) and investigating the properties of the globular cluster (GC) system around the central cD galaxy NGC 3311. We obtained VIMOS medium-resolution spectra of about 1200 candidate objects with apparent magnitudes 18.5<V<24.0mag, covering both the bright end of the GC luminosity function and the luminosity range of all known UCDs. By means of spectroscopic redshift measurements, we identified 118 cluster members, from which 52 are brighter than MV=-11.0mag, and can therefore be termed UCDs. The brightest UCD in our sample has an absolute magnitude of MV=-13.4mag (corresponding to a mass of >5x107M☉) and a half-light radius of 25pc. This places it among the brightest and most massive UCDs ever discovered. Most of the GCs/UCDs are both spatially and dynamically associated to the central cD galaxy. The overall velocity dispersion of the GCs/UCDs is comparable to what is found for the cluster galaxies. However, when splitting the sample into a bright and a faint part, we observe a lower velocity dispersion for the bright UCDs/GCs than for the fainter objects. At a dividing magnitude of MV=-10.75mag, the dispersions differ by more than 200km/s and up to 300km/s for objects within 5' around NGC 3311. We interpret these results in the context of different UCD formation channels, and conclude that interaction-driven formation seems to play an important role in the centre of Hydra I.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Hydra I - galaxies: dwarf - galaxies: fundamental parameters - galaxies: star clusters: general - galaxies: kinematics and dynamics - globular clusters: general

VizieR on-line data: <Available at CDS (J/A+A/531/A4): tablea1.dat>

Nomenclature: Table A.1: [MMH2011] HUCDNN (Nos HUCD1-HUCD52), [MMH2011] NNN (Nos 53-118).

CDS comments: Paragraph.1 W3 = [WSL93] 3

Simbad objects: 137

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Number of rows : 137
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10600 1
2 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1535 1
3 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1738 0
4 2MASS J03385407-3533331 GiC 03 38 54.0545340024 -35 33 33.320376180   18.5 18.06     ~ 71 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16636 1
6 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 168 0
7 [MMH2011] HUCD9 Gl? 10 35 36.7 -27 17 40           ~ 2 0
8 [MMH2008] q3-18 G 10 35 45.710 -27 33 38.41     22.611 21.92   ~ 3 0
9 [MMH2011] HUCD52 Gl? 10 35 52.9 -27 35 32           ~ 2 0
10 [MMH2011] 78 Gl? 10 35 53.0 -27 23 07           ~ 2 0
11 [MMH2011] HUCD13 Gl? 10 36 01.9 -27 23 01           ~ 2 0
12 [MMH2011] HUCD31 Gl? 10 36 05.6 -27 27 04           ~ 2 0
13 [MMH2011] HUCD17 Gl? 10 36 06.0 -27 36 33           ~ 2 0
14 [MMH2011] HUCD38 Gl? 10 36 07.2 -27 32 51           ~ 2 0
15 [MMH2011] HUCD20 Gl? 10 36 14.0 -27 27 56           ~ 2 0
16 [MMH2011] HUCD2 Gl? 10 36 19.4 -27 26 06           ~ 2 0
17 [MMH2011] 74 Gl? 10 36 26.8 -27 32 23           ~ 2 0
18 [MMH2011] HUCD50 Gl? 10 36 28.1 -27 31 07           ~ 2 0
19 [MMH2011] 109 Gl? 10 36 29.1 -27 31 35           ~ 2 0
20 [MMH2011] 115 Gl? 10 36 29.6 -27 31 13           ~ 3 0
21 [MMH2011] 94 Gl? 10 36 30.0 -27 31 02           ~ 3 0
22 [MMH2011] 57 Gl? 10 36 30.1 -27 34 26           ~ 2 0
23 [MMH2011] 79 Gl? 10 36 30.6 -27 21 37           ~ 2 0
24 [MMH2011] HUCD14 Gl? 10 36 31.4 -27 30 26           ~ 4 0
25 [MMH2011] 86 Gl? 10 36 31.5 -27 33 21           ~ 2 0
26 [MMH2011] HUCD35 Gl? 10 36 31.7 -27 30 32           ~ 4 0
27 [MMH2011] HUCD10 Gl? 10 36 31.8 -27 29 14           ~ 2 0
28 [SGM95] 2 Gl? 10 36 31.90 -27 30 16.4           ~ 3 0
29 [SGM95] 74 Gl? 10 36 32.00 -27 30 37.2           ~ 4 0
30 [MMH2011] 90 Gl? 10 36 32.3 -27 31 35           ~ 3 0
31 [MMH2011] 103 Gl? 10 36 32.4 -27 34 54           ~ 2 0
32 [WH2007] UCD 2 Gl? 10 36 32.456 -27 29 24.88           ~ 4 0
33 [MMH2011] 104 Gl? 10 36 32.6 -27 26 30           ~ 2 0
34 [MMH2011] HUCD46 Gl? 10 36 33.2 -27 30 55           ~ 3 0
35 [MMH2011] 75 Gl? 10 36 34.2 -27 21 32           ~ 2 0
36 [MMH2011] HUCD5 Gl? 10 36 34.4 -27 30 15           ~ 2 0
37 [MMH2011] HUCD4 Gl? 10 36 34.8 -27 34 46           ~ 2 0
38 [WH2007] UCD 8 Gl? 10 36 34.899 -27 29 44.90           ~ 4 0
39 [MMH2011] HUCD26 Gl? 10 36 35.0 -27 33 00           ~ 2 0
40 [MMH2011] HUCD37 Gl? 10 36 35.6 -27 35 11           ~ 2 0
41 NGC 3309 GiG 10 36 35.6607096792 -27 31 05.732321664   11.98 11.78 10.34 10.51 ~ 156 0
42 [MMH2011] 117 Gl? 10 36 35.8 -27 29 57           ~ 2 0
43 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 817 1
44 [MMH2011] HUCD42 Gl? 10 36 36.3 -27 32 16           ~ 2 0
45 [MMH2011] 101 Gl? 10 36 37.7 -27 32 06           ~ 3 0
46 [MMH2011] 89 Gl? 10 36 37.7 -27 29 55           ~ 2 0
47 [MMH2011] HUCD41 Gl? 10 36 37.8 -27 34 44           ~ 2 0
48 [MMH2011] 64 Gl? 10 36 38.0 -27 30 17           ~ 2 0
49 [MMH2011] 59 Gl? 10 36 38.3 -27 32 21           ~ 3 0
50 [MMH2011] 73 Gl? 10 36 38.8 -27 30 55           ~ 2 0
51 [MMH2011] 66 G 10 36 38.98 -27 31 23.7     23.24   21.91 ~ 5 0
52 [MMH2011] 95 Gl? 10 36 39.0 -27 30 22           ~ 2 0
53 [SGM95] 101 Gl? 10 36 39.316 -27 30 53.73           ~ 4 0
54 [MMH2011] 68 Gl? 10 36 39.5 -27 31 28           ~ 3 0
55 [SGM95] 109 Gl? 10 36 39.54 -27 29 51.0           ~ 3 0
56 [MMH2011] 107 Gl? 10 36 40.3 -27 34 43           ~ 2 0
57 [MMH2011] 84 Gl? 10 36 40.5 -27 35 12           ~ 2 0
58 [MMH2011] HUCD48 Gl? 10 36 40.6 -27 26 27           ~ 2 0
59 [MMH2011] 111 Gl? 10 36 40.9 -27 34 16           ~ 2 0
60 [MMH2011] 92 Gl? 10 36 40.9 -27 30 43           ~ 2 0
61 [MMH2011] 56 Gl? 10 36 40.9 -27 25 09           ~ 2 0
62 [MMH2011] HUCD16 Gl? 10 36 41.1 -27 31 18           ~ 2 0
63 [MMH2011] 112 Gl? 10 36 41.2 -27 32 49           ~ 3 0
64 [MMH2011] 69 Gl? 10 36 41.2 -27 32 47           ~ 3 0
65 [MMH2011] 93 Gl? 10 36 41.9 -27 36 40           ~ 2 0
66 [MMH2011] 106 Gl? 10 36 41.9 -27 34 53           ~ 2 0
67 [MMH2011] HUCD3 Gl? 10 36 41.9 -27 19 45           ~ 2 0
68 [MMH2011] 91 Gl? 10 36 42.1 -27 30 28           ~ 2 0
69 [MMH2011] HUCD7 Gl? 10 36 42.1 -27 24 03           ~ 2 0
70 [MMH2011] HUCD1 Gl? 10 36 42.50 -27 32 52.9           ~ 4 0
71 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 290 2
72 [MMH2011] 82 Gl? 10 36 42.9 -27 27 59           ~ 2 0
73 [MMH2011] 80 Gl? 10 36 43.0 -27 34 09           ~ 2 0
74 [MMH2011] 77 Gl? 10 36 43.2 -27 28 28           ~ 2 0
75 [MMH2011] HUCD33 Gl? 10 36 43.4 -27 25 21           ~ 2 0
76 [MMH2011] HUCD18 Gl? 10 36 43.5 -27 31 49           ~ 3 0
77 [SGM95] 40 Gl? 10 36 43.77 -27 33 17.1           ~ 3 0
78 [MMH2011] HUCD8 G 10 36 43.80 -27 32 22.2           ~ 4 0
79 [MMH2011] 63 Gl? 10 36 43.8 -27 27 12           ~ 2 0
80 [MMH2011] HUCD6 Gl? 10 36 43.9 -27 37 57           ~ 2 0
81 [MMH2011] 54 Gl? 10 36 44.5 -27 30 45           ~ 3 0
82 [MMH2011] 110 Gl? 10 36 44.7 -27 32 55           ~ 3 0
83 [MMH2011] 70 Gl? 10 36 44.9 -27 33 36           ~ 2 0
84 [WH2007] UCD 5 G 10 36 44.923 -27 34 20.21           ~ 3 0
85 [MMH2011] HUCD39 G 10 36 45.1 -27 31 51           ~ 2 0
86 [MMH2011] 67 Gl? 10 36 45.3 -27 33 44           ~ 2 0
87 [MMH2011] 118 Gl? 10 36 45.3 -27 33 20           ~ 2 0
88 [MMH2011] 55 Gl? 10 36 45.3 -27 29 27           ~ 2 0
89 [MMH2011] HUCD12 Gl? 10 36 45.5 -27 29 52           ~ 2 0
90 [MMH2011] 96 Gl? 10 36 45.5 -27 23 50           ~ 2 0
91 [MMH2011] 76 Gl? 10 36 45.8 -27 33 44           ~ 2 0
92 [MMH2011] 88 Gl? 10 36 46.0 -27 35 10           ~ 2 0
93 [MMH2011] 113 Gl? 10 36 46.0 -27 34 22           ~ 2 0
94 [MMH2011] HUCD49 Gl? 10 36 46.3 -27 34 19           ~ 2 0
95 [MMH2011] 97 Gl? 10 36 46.4 -27 31 36           ~ 2 0
96 [MMH2011] 58 Gl? 10 36 46.4 -27 29 32           ~ 2 0
97 [MMH2011] 72 Gl? 10 36 47.0 -27 35 18           ~ 2 0
98 [MMH2011] HUCD21 Gl? 10 36 47.4 -27 31 07           ~ 4 0
99 [MMH2011] 116 Gl? 10 36 47.5 -27 32 59           ~ 2 0
100 [MMH2011] HUCD44 G 10 36 48.1 -27 32 23           ~ 2 0
101 [MMH2011] HUCD29 Gl? 10 36 48.2 -27 22 18           ~ 2 0
102 [MMH2011] 99 Gl? 10 36 48.3 -27 31 59           ~ 3 0
103 [MMH2011] HUCD43 Gl? 10 36 48.4 -27 35 03           ~ 2 0
104 [MMH2011] HUCD34 Gl? 10 36 48.5 -27 34 43           ~ 2 0
105 [MMH2011] HUCD15 Gl? 10 36 49.3 -27 36 02           ~ 2 0
106 [MMH2011] 83 Gl? 10 36 49.9 -27 33 02           ~ 2 0
107 [MMH2011] 60 Gl? 10 36 50.0 -27 38 27           ~ 2 0
108 [MMH2011] 61 Gl? 10 36 50.0 -27 32 35           ~ 3 0
109 [MMH2011] HUCD30 G 10 36 50.0 -27 31 55           ~ 3 0
110 [MMH2011] HUCD45 Gl? 10 36 50.2 -27 36 10           ~ 2 0
111 [MMH2011] 102 Gl? 10 36 50.3 -27 29 07           ~ 2 0
112 [MMH2011] 85 Gl? 10 36 50.7 -27 33 13           ~ 2 0
113 [WH2007] UCD 23 G 10 36 50.82 -27 32 03.7     23.05   21.82 ~ 4 0
114 [MMH2011] 87 Gl? 10 36 50.9 -27 35 28           ~ 2 0
115 [MMH2011] 100 Gl? 10 36 50.9 -27 33 38           ~ 2 0
116 [MMH2011] 108 Gl? 10 36 51.5 -27 35 15           ~ 2 0
117 [MMH2011] HUCD28 Gl? 10 36 52.9 -27 24 33           ~ 2 0
118 [MMH2011] 65 Gl? 10 36 53.1 -27 35 44           ~ 2 0
119 [MMH2011] HUCD24 Gl? 10 36 56.8 -27 33 31           ~ 2 0
120 [MMH2011] 105 Gl? 10 36 57.1 -27 36 38           ~ 2 0
121 [MMH2011] HUCD32 Gl? 10 36 57.3 -27 26 01           ~ 2 0
122 [MMH2011] HUCD22 Gl? 10 36 58.0 -27 35 59           ~ 2 0
123 [MMH2011] 98 Gl? 10 36 58.2 -27 25 30           ~ 2 0
124 [MMH2011] HUCD36 Gl? 10 37 01.2 -27 27 19           ~ 2 0
125 [MMH2011] 71 Gl? 10 37 01.5 -27 24 07           ~ 2 0
126 [MMH2011] 81 Gl? 10 37 03.7 -27 26 42           ~ 2 0
127 [MMH2011] HUCD23 Gl? 10 37 43.1 -27 36 01           ~ 2 0
128 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1316 1
129 NGC 4400 PoG 12 25 56.0 +33 30 54           ~ 2 0
130 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6417 0
131 2MASS J12315289+1215589 G 12 31 52.8990925992 +12 15 59.041171656           ~ 45 0
132 SDSS J124155.33+114003.7 G 12 41 55.3338419712 +11 40 03.790134948           ~ 51 0
133 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1036 2
134 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4629 2
135 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3315 0
136 [WSL93] 3 GlC 22 20 43.878 -24 40 37.87     17.86     ~ 52 0
137 NGC 7252 IG 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 689 1

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2023.03.27-05:56:46

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