2010ApJ...723..251C

Query : 2010ApJ...723..251C

2010ApJ...723..251C - Astrophys. J., 723, 251-266 (2010/November-1)

Keck/LRIS spectroscopic confirmation of Coma cluster dwarf galaxy membership assignments.

CHIBOUCAS K., TULLY R.B., MARZKE R.O., TRENTHAM N., FERGUSON H.C., HAMMER D., CARTER D. and KHOSROSHAHI H.

Abstract (from CDS):

Keck/LRIS multi-object spectroscopy has been carried out on 140 of some of the lowest and highest surface brightness faint (19 < R < 22) dwarf galaxy candidates in the core region of the Coma Cluster. These spectra are used to measure redshifts and establish membership for these faint dwarf populations. The primary goal of the low surface brightness sample is to test our ability to use morphological and surface brightness criteria to distinguish between Coma Cluster members and background galaxies using high resolution Hubble Space Telescope/Advanced Camera for Surveys images. Candidates were rated as expected members, uncertain, or expected background. From 93 spectra, 51 dwarf galaxy members and 20 background galaxies are identified. Our morphological membership estimation success rate is ∼100% for objects expected to be members and better than ∼90% for galaxies expected to be in the background. We confirm that low surface brightness is a very good indicator of cluster membership. High surface brightness galaxies are almost always background with confusion arising only from the cases of the rare compact elliptical (cE) galaxies. The more problematic cases occur at intermediate surface brightness. Many of these galaxies are given uncertain membership ratings, and these were found to be members about half of the time. Including color information will improve membership determination but will fail for some of the same objects that are already misidentified when using only surface brightness and morphology criteria. cE galaxies with B-V colors ∼0.2 mag redward of the red sequence in particular require spectroscopic follow up. In a sample of 47 high surface brightness, ultracompact dwarf candidates, 19 objects have redshifts which place them in the Coma Cluster, while another 6 have questionable redshift measurements but may also prove to be members. Redshift measurements are presented and the use of indirect means for establishing cluster membership is discussed.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Coma - galaxies: dwarf

VizieR on-line data: <Available at CDS (J/ApJ/723/251): table2.dat>

Nomenclature: Table 2: [CTM2010] NNNNNNN N=101 among (Nos 10162-4042826).

Simbad objects: 107

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Number of rows : 107
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 NAME NGC 1023 Group GrG 02 39 37.9 +39 20 51           ~ 81 0
2 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
3 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 0
4 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
5 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
6 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
7 [ARF2020] COMA 22 7106 LSB 12 59 26.038 +28 01 03.96     21.53 21.46 21.7 ~ 4 0
8 [EDG2007] 588 G 12 59 29.13 +28 01 32.3 21.668 21.23 19.78 19.05 18.97 ~ 5 0
9 GMP 3397 G 12 59 30.76 +28 02 31.5 18.864 18.999 18.44 17.822 18.1 ~ 10 0
10 [CTM2010] 190797 G 12 59 31.7 +27 57 48       21.79 21.2 ~ 3 0
11 GMP 3378 G 12 59 31.8 +28 00 36       21.81 21.60 ~ 3 0
12 [CTM2010] 190565 G 12 59 32.75 +27 59 26.3       22.00 23.64 ~ 1 0
13 SDSS J125934.40+275942.8 G 12 59 34.403 +27 59 42.89     19.94 19.68 19.9 ~ 11 0
14 [CTM2010] 120551 G 12 59 34.78 +28 02 01.4       22.01 22.05 ~ 1 0
15 [CTM2010] 192254 G 12 59 35.23 +27 58 50.3       22.25 22.25 ~ 1 0
16 [EDG2007] 623 G 12 59 37.05 +27 58 47.6 24.529 21.788 21.352 20.121 21.383 ~ 2 0
17 [CTM2010] 194749 G 12 59 38.1 +27 56 56       21.73 21.6 ~ 3 0
18 [CTM2010] 1038885 G 12 59 38.62 +27 56 58.7       21.36 22.10 ~ 2 0
19 [CTM2010] 195768 G 12 59 40.73 +27 57 02.9       22.47 21.82 ~ 1 0
20 [CTM2010] 122743 G 12 59 42.27 +28 00 54.5   21.98   20.17 20.19 ~ 4 0
21 [CTM2010] 195506 G 12 59 42.93 +27 59 54.2         19.77 ~ 2 0
22 SDSS J125943.95+275802.0 G 12 59 43.942 +27 58 02.14     21.06 20.74 21.0 ~ 5 0
23 SDSS J125943.98+275615.0 G 12 59 43.986 +27 56 15.06       21.54 21.7 ~ 4 0
24 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
25 GMP 3193 LSB 12 59 44.762 +27 58 07.19   21.21 20.57 19.70 19.61 ~ 7 0
26 GMP 3112 G 12 59 51.817 +27 57 26.31       20.54 20.0 ~ 7 0
27 SDSS J125952.18+275946.3 G 12 59 52.188 +27 59 46.34     20.64 20.35 20.6 ~ 9 0
28 [ARF2020] COMA 22 7187 G 12 59 52.591 +27 56 57.74     21.57 21.06 21.08 ~ 2 0
29 [CTM2010] 181737 G 12 59 53.19 +28 00 10.6       22.11 22.01 ~ 1 0
30 [CTM2010] 182496 G 12 59 53.74 +27 58 21.6         22.66 ~ 1 0
31 [ARF2020] COMA 22 3923 G 12 59 59.971 +27 59 17.92     20.24 20.02 20.19 ~ 3 0
32 [ARF2020] COMA 22 8202 LSB 13 00 06.895 +28 01 55.97     22.07 21.79 23.53 ~ 2 0
33 [ARF2020] COMA 22 7950 LSB 13 00 07.939 +27 56 35.55     21.93 21.36 22.0 ~ 4 0
34 [CTM2010] 100600 G 13 00 09.01 +28 02 44.8       22.17 21.82 ~ 1 0
35 [CTM2010] 100940 G 13 00 09.79 +28 01 37.2       21.03 21.06 ~ 1 0
36 SDSS J130010.38+275616.9 G 13 00 10.386 +27 56 16.97       20.36 20.3 ~ 5 0
37 [APS2006] 46994 G 13 00 11.810 +28 05 06.40   23.32 22.59 22.12 21.61 ~ 1 0
38 [CTM2010] 31001 G 13 00 11.96 +28 04 03.0       21.83 22.06 ~ 2 0
39 SDSS J130013.49+280214.9 LSB 13 00 13.490 +28 02 14.98         20.8 ~ 5 0
40 [CTM2010] 101905 G 13 00 13.85 +28 00 15.1       21.79 21.90 ~ 1 0
41 [CTM2010] 230804 G 13 00 14.14 +27 53 58.1       21.39 20.73 ~ 1 0
42 [ARF2020] COMA 22 7521 LSB 13 00 14.215 +28 00 26.43     21.72 21.47 21.8 ~ 4 0
43 SDSS J130015.73+280146.7 LSB 13 00 15.731 +28 01 46.73     20.45 20.17 20.4 ~ 6 0
44 [ARF2020] COMA 22 7558 LSB 13 00 16.226 +27 54 44.39     21.74 21.34 21.7 ~ 4 0
45 [CTM2010] 230475 G 13 00 16.280 +27 56 30.48       19.25 19.41 ~ 3 0
46 SDSS J130016.35+275522.1 G 13 00 16.358 +27 55 22.11     19.61 19.33 19.6 ~ 9 0
47 SDSS J130016.67+275638.6 LSB 13 00 16.673 +27 56 38.67   20.58 19.93 18.76 18.52 ~ 11 0
48 [CTM2010] 161002 G 13 00 17.60 +27 58 07.6         20.03 ~ 1 0
49 [CTM2010] 32265 G 13 00 17.67 +28 03 34.5       21.57 21.54 ~ 1 0
50 GMP 2789 G 13 00 18.3 +27 58 18   22.44 21.82 21.10 20.78 ~ 6 0
51 SDSS J130018.42+275516.8 G 13 00 18.420 +27 55 16.84     20.41 20.04 20.1 ~ 5 0
52 [CTM2010] 160607 G 13 00 18.63 +27 58 22.7       22.51 22.77 ~ 1 0
53 [CTM2010] 160796 G 13 00 18.66 +27 58 17.1       23.41 23.20 ~ 1 0
54 [CTM2010] 160792 G 13 00 18.93 +27 58 00.5       22.17 22.62 ~ 1 0
55 SDSS J130019.33+280421.9 G 13 00 19.335 +28 04 21.93     21.69 21.37 21.8 ~ 5 0
56 [ARF2020] COMA 12 5414 LSB 13 00 19.735 +27 59 04.81     20.86 20.45 21.0 ~ 4 0
57 [ARF2020] COMA 12 6888 LSB 13 00 20.270 +28 02 02.17     21.44 20.93 22.49 ~ 2 0
58 GMP 2754 GiC 13 00 20.280 +28 04 53.22     20.02 19.84 20.4 ~ 8 0
59 [CTM2010] 161665 G 13 00 20.50 +27 57 00.1       22.17 21.51 ~ 1 0
60 [CTM2010] 32751 G 13 00 20.62 +28 04 15.7       20.75 20.37 ~ 1 0
61 SDSS J130021.38+280327.3 LSB 13 00 21.384 +28 03 27.33   21.89 20.88 20.49 20.5 ~ 9 0
62 [CTM2010] 32799 G 13 00 21.79 +28 04 41.5       22.03 22.62 ~ 1 0
63 SDSS J130022.01+280220.9 LSB 13 00 21.9 +28 02 18   22.03 21.27 20.21 20.51 ~ 8 0
64 [CTM2010] 230000 G 13 00 22.840 +27 55 15.52           ~ 1 0
65 [ARF2020] COMA 12 5305 G 13 00 22.872 +28 00 56.72     20.81 20.50 21.58 ~ 2 0
66 SDSS J130022.90+275515.0 G 13 00 22.905 +27 55 15.08   20.82 20.15 18.85 19.03 ~ 10 0
67 [ARF2020] COMA 12 4624 LSB 13 00 23.230 +27 59 48.63     20.55 20.23 21.1 ~ 5 0
68 GMP 2707 G 13 00 23.48 +28 03 01.8   20.60 19.89 19.29 19.53 ~ 6 0
69 [CTM2010] 20411 G 13 00 24.62 +28 03 42.9       22.45 22.13 ~ 1 0
70 SDSS J130024.85+275921.8 G 13 00 24.851 +27 59 21.84     19.39 19.19 19.8 ~ 7 0
71 SDSS J130025.04+275638.1 G 13 00 25.049 +27 56 38.12     19.77 19.43 20.1 ~ 6 0
72 GMP 2672 G 13 00 26.791 +27 59 53.36     20.06 19.85 20.54 ~ 5 0
73 [CTM2010] 232587 G 13 00 27.17 +27 54 53.3       22.19 21.86 ~ 1 0
74 SDSS J130027.33+280033.4 AG? 13 00 27.27 +28 00 34.2 20.89 20.71 19.61 19.03 18.98 ~ 12 0
75 [BKY2023] 560 LSB 13 00 28.55 +27 58 59.2       22.13 21.93 ~ 2 0
76 SDSS J130029.72+275806.5 LSB 13 00 29.723 +27 58 06.55         21.2 ~ 6 0
77 SDSS J130030.06+280134.8 G 13 00 30.063 +28 01 34.86     20.45 20.23 20.9 ~ 6 0
78 SDSS J130030.93+280312.8 G 13 00 30.939 +28 03 12.81     20.00 20.09 20.4 ~ 5 0
79 SDSS J130031.97+280125.1 LSB 13 00 31.764 +28 01 21.87     20.43 20.13 21.0 ~ 6 0
80 SDSS J130032.48+275833.2 G 13 00 32.483 +27 58 33.21     18.52 18.30 18.9 ~ 8 0
81 [ARF2020] COMA 12 6927 LSB 13 00 33.002 +27 59 44.02     21.46 21.09 22.0 ~ 4 0
82 [CTM2010] 220952 G 13 00 34.25 +27 54 47.2       21.87 21.26 ~ 1 0
83 SDSS J130034.32+275817.6 G 13 00 34.323 +27 58 17.62     19.98 19.76 20.4 ~ 6 0
84 [CTM2010] 22069 G 13 00 34.77 +28 04 32.9       22.38 22.25 ~ 1 0
85 [CTM2010] 22382 G 13 00 35.74 +28 03 19.4       21.19 20.54 ~ 1 0
86 SDSS J130035.99+275505.4 G 13 00 35.994 +27 55 05.43     19.56 19.25 19.8 ~ 6 0
87 [CTM2010] 221307 G 13 00 36.22 +27 55 34.6       20.78 20.67 ~ 1 0
88 [CTM2010] 92663 G 13 00 36.533 +28 02 56.16   21.86 21.43 21.02 21.58 ~ 5 0
89 [CTM2010] 151072 G 13 00 37.8258 +27 58 40.602       21.48 21.60 ~ 6 0
90 GMP 2550 G 13 00 38.98 +28 00 35.3 19.28 19.149 18.45 17.885 17.284 ~ 8 0
91 SDSS J130039.31+275748.1 LSB 13 00 39.316 +27 57 48.11     19.85 19.57 20.4 ~ 7 0
92 SDSS J130039.35+280410.8 LSB 13 00 39.352 +28 04 10.89   21.45 20.21 19.87 20.5 ~ 11 0
93 [CTM2010] 80801 G 13 00 39.68 +28 00 41.7         21.96 ~ 1 0
94 [CTM2010] 80686 G 13 00 39.74 +28 01 11.9       22.53 22.25 ~ 1 0
95 [CTM2010] 80942 G 13 00 39.94 +28 00 24.1       21.89 21.43 ~ 1 0
96 [CTM2010] 10217 G 13 00 40.36 +28 04 54.5       22.11 21.66 ~ 1 0
97 [CTM2010] 80928 G 13 00 42.36 +28 02 41.4       22.01 21.81 ~ 1 0
98 SDSS J130042.51+280325.4 AG? 13 00 42.519 +28 03 25.44 20.40 19.9 18.89 18.46 19.0 ~ 10 0
99 SDSS J130043.72+275921.1 LSB 13 00 43.727 +27 59 21.11     20.94 20.54 21.1 ~ 6 0
100 [CTM2010] 151841 G 13 00 43.79 +27 59 00.0       22.36 22.44 ~ 1 0
101 SDSS J130044.10+280215.4 G 13 00 44.104 +28 02 15.44     18.74 18.37 18.5 ~ 8 0
102 [CTM2010] 10863 G 13 00 45.15 +28 05 20.6       21.64 21.60 ~ 1 0
103 SDSS J130045.85+280335.9 G 13 00 45.857 +28 03 35.94       20.98 21.5 ~ 4 0
104 SDSS J130047.52+275829.9 G 13 00 47.526 +27 58 29.91     20.82 20.48 20.9 ~ 5 0
105 SDSS J130051.02+280347.4 G 13 00 51.023 +28 03 47.46       21.96 21.9 ~ 4 0
106 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
107 ACO S 740 ClG 13 43 32 -38 11.1           ~ 21 0

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