2010ApJ...722.1707M

Query : 2010ApJ...722.1707M

2010ApJ...722.1707M - Astrophys. J., 722, 1707-1715 (2010/October-3)

Ultra-compact dwarfs in the core of the Coma cluster.

MADRID J.P., GRAHAM A.W., HARRIS W.E., GOUDFROOIJ P., FORBES D.A., CARTER D., BLAKESLEE J.P., SPITLER L.R. and FERGUSON H.C.

Abstract (from CDS):

We have discovered both a red and a blue subpopulation of ultra-compact dwarf (UCD) galaxy candidates in the Coma galaxy cluster. We analyzed deep F475W (Sloan g) and F814W (I) Hubble Space Telescope images obtained with the Advanced Camera for Surveys Wide Field Channel as part of the Coma Cluster Treasury Survey and have fitted the light profiles of ∼5000 point-like sources in the vicinity of NGC 4874, one of the two central dominant galaxies of the Coma Cluster. Although almost all of these sources are globular clusters that remain unresolved, we found that 52 objects have effective radii between ∼10 and 66 pc, in the range spanned by dwarf globular transition objects (DGTOs) and UCDs. Of these 52 compact objects, 25 are brighter than MV ∼ -11 mag, a magnitude conventionally thought to separate UCDs and globular clusters. The UCD/DGTO candidates have the same color and luminosity distribution as the most luminous globular clusters within the red and blue subpopulations of the immensely rich NGC 4874 globular cluster system. Unlike standard globular clusters, blue and red UCD/DGTO subpopulations have the same median effective radius. The spatial distribution of UCD/DGTO candidates reveals that they congregate toward NGC 4874 and are not uniformly distributed. We find a relative deficit of UCD/DGTOs compared with globular clusters in the inner 15 kpc around NGC 4874; however, at larger radii UCD/DGTO and globular clusters follow the same spatial distribution.

Abstract Copyright: ∼

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: star clusters: general - galaxies: structure - globular clusters: general

Nomenclature: Table 1: [MGH2010] JHHMMSS.ss+DDMMSS.s N=52.

Simbad objects: 70

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Number of rows : 70
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 ACO S 40 ClG 00 24 52 -36 45.4           ~ 3 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
4 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
5 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
6 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 0
7 NGC 3311 EmG 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 310 2
8 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
9 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
10 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
11 [MGH2010] J125928.25+275713.4 G? 12 59 28.25 +27 57 13.4         23.82 ~ 1 0
12 NGC 4871 LIN 12 59 29.9631023208 +27 57 23.169658968 15.59 15.1 14.07 13.801 13.113 ~ 121 0
13 [MGH2010] J125930.74+275707.6 G? 12 59 30.74 +27 57 07.6         22.87 ~ 1 0
14 SDSS J125930.82+275810.1 G 12 59 30.823 +27 58 10.19     19.96 19.71 19.4 ~ 4 0
15 [MGH2010] J125931.05+275802.8 G? 12 59 31.05 +27 58 02.8         23.34 ~ 1 0
16 [MGH2010] J125931.23+275835.9 G? 12 59 31.23 +27 58 35.9         23.27 ~ 1 0
17 [MGH2010] J125932.33+275808.4 G? 12 59 32.33 +27 58 08.4         22.40 ~ 1 0
18 [MGH2010] J125932.38+280007.1 G? 12 59 32.38 +28 00 07.1         23.46 ~ 1 0
19 NGC 4873 EmG 12 59 32.7956813376 +27 59 01.023698256 15.53 15.4 14.36 14.24 13.224 ~ 125 0
20 [MGH2010] J125933.60+275716.8 G? 12 59 33.60 +27 57 16.8         22.77 ~ 1 0
21 [MGH2010] J125935.03+275838.4 G? 12 59 35.03 +27 58 38.4         23.59 ~ 1 0
22 [MGH2010] J125935.25+275736.4 G? 12 59 35.25 +27 57 36.4         23.14 ~ 1 0
23 [MGH2010] J125935.31+275814.9 G? 12 59 35.31 +27 58 14.9         22.33 ~ 1 0
24 [MGH2010] J125935.62+275810.4 G? 12 59 35.62 +27 58 10.4         22.67 ~ 1 0
25 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 12.71 12.27 11.386 ~ 814 3
26 [MGH2010] J125935.88+275817.1 G? 12 59 35.88 +27 58 17.1         23.58 ~ 1 0
27 [CTM2010] 192636 G 12 59 36.0394 +27 58 05.202       21.67 22.37 ~ 2 0
28 [MGH2010] J125936.54+275851.4 G? 12 59 36.54 +27 58 51.4         24.01 ~ 1 0
29 [MGH2010] J125936.59+275908.3 G? 12 59 36.59 +27 59 08.3         22.94 ~ 1 0
30 [MGH2010] J125936.83+275828.1 G? 12 59 36.83 +27 58 28.1         21.81 ~ 1 0
31 [MGH2010] J125937.20+275720.9 G? 12 59 37.20 +27 57 20.9         23.10 ~ 1 0
32 [MGH2010] J125937.37+275754.4 G? 12 59 37.37 +27 57 54.4         24.00 ~ 1 0
33 [MGH2010] J125937.45+275727.7 G? 12 59 37.45 +27 57 27.7         23.12 ~ 1 0
34 [MGH2010] J125937.68+275837.6 G? 12 59 37.68 +27 58 37.6         21.68 ~ 1 0
35 [MGH2010] J125937.72+275802.4 G? 12 59 37.72 +27 58 02.4         23.95 ~ 1 0
36 [MGH2010] J125937.99+275820.8 G? 12 59 37.99 +27 58 20.8         22.10 ~ 1 0
37 [MGH2010] J125938.19+275737.7 G? 12 59 38.19 +27 57 37.7         22.94 ~ 1 0
38 [MGH2010] J125938.44+275737.4 G? 12 59 38.44 +27 57 37.4         23.61 ~ 1 0
39 [MGH2010] J125938.51+275827.6 G? 12 59 38.51 +27 58 27.6         24.22 ~ 1 0
40 [CTM2010] 1038885 G 12 59 38.62 +27 56 58.7       21.36 22.10 ~ 2 0
41 [MGH2010] J125938.73+275937.7 G? 12 59 38.73 +27 59 37.7         23.05 ~ 1 0
42 [MGH2010] J125938.86+275835.9 G? 12 59 38.86 +27 58 35.9         24.03 ~ 1 0
43 [MGH2010] J125938.92+275830.6 G? 12 59 38.92 +27 58 30.6         23.92 ~ 1 0
44 [MGH2010] J125938.99+275900.9 G? 12 59 38.99 +27 59 00.9         24.16 ~ 1 0
45 [MGH2010] J125939.13+275911.2 G? 12 59 39.13 +27 59 11.2         24.07 ~ 1 0
46 [MGH2010] J125939.14+275713.8 G? 12 59 39.14 +27 57 13.8         22.85 ~ 1 0
47 [MGH2010] J125939.22+275746.5 G? 12 59 39.22 +27 57 46.5         21.62 ~ 1 0
48 [HVH2010] Comai J125939.218+275954.67 G 12 59 39.2258209738 +27 59 54.749231757   21.33     19.76 ~ 6 0
49 [MGH2010] J125939.30+275820.0 G? 12 59 39.30 +27 58 20.0         22.74 ~ 1 0
50 [CTM2010] 1041346 G 12 59 39.4006 +27 58 40.047       21.65 21.89 ~ 5 0
51 [CTM2010] 195526 G 12 59 40.3899 +27 57 30.905       22.12 21.95 ~ 5 0
52 [MGH2010] J125940.39+275700.4 G? 12 59 40.39 +27 57 00.4         23.56 ~ 1 0
53 [MGH2010] J125940.49+275829.4 G? 12 59 40.49 +27 58 29.4         23.96 ~ 1 0
54 [MGH2010] J125940.60+275808.4 G? 12 59 40.60 +27 58 08.4         21.14 ~ 1 0
55 [MGH2010] J125940.64+275840.3 G? 12 59 40.64 +27 58 40.3         21.90 ~ 1 0
56 [MGH2010] J125940.68+275831.9 G? 12 59 40.68 +27 58 31.9         23.92 ~ 1 0
57 [MGH2010] J125940.76+275850.5 G? 12 59 40.76 +27 58 50.5         23.14 ~ 1 0
58 [MGH2010] J125941.09+275825.4 G? 12 59 41.09 +27 58 25.4         22.53 ~ 1 0
59 [CTM2010] 1039188 G 12 59 41.1987 +27 57 10.907       21.97 22.10 ~ 5 0
60 [MGH2010] J125941.52+275937.2 G? 12 59 41.52 +27 59 37.2         23.00 ~ 1 0
61 [CTM2010] 195614 G 12 59 41.8837 +27 58 48.633       22.28 22.39 ~ 5 0
62 [MGH2010] J125942.26+275841.9 G? 12 59 42.26 +27 58 41.9         23.26 ~ 1 0
63 [MGH2010] J125942.90+275917.7 G? 12 59 42.90 +27 59 17.7         22.78 ~ 1 0
64 [MGH2010] J125944.36+275817.8 G? 12 59 44.36 +27 58 17.8         22.44 ~ 1 0
65 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
66 [CTM2010] 196790 G 12 59 44.9144 +27 58 54.128       21.86 21.90 ~ 6 0
67 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 742 1
68 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
69 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
70 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0

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