2010AJ....139..216L


Query : 2010AJ....139..216L

2010AJ....139..216L - Astron. J., 139, 216-227 (2010/January-0)

Revisiting the fossil group candidates UGC 842 and NGC 6034.

LOPES DE OLIVEIRA R., CARRASCO E.R., MENDES DE OLIVEIRA C., BORTOLETTO D.R., CYPRIANO E., SODRE L. and LIMA NETO G.B.

Abstract (from CDS):

We present a new insight on NGC 6034 and UGC 842, two groups of galaxies previously reported in the literature as being fossil groups. The study is based on optical photometry and spectroscopy obtained with the CTIO Blanco telescope and Sloan Digital Sky Survey archival data. We find that NGC 6034 is embedded in a large structure, dominated by three rich clusters and other small groups. Its first and next four ranked galaxies have magnitude differences in the r band and projected distances which violate the optical criteria to classify it as a fossil group. We confirm that the UGC 842 group is a fossil group, but with about half the velocity dispersion that is reported in previous works. The velocity distribution of its galaxies reveals the existence of two structures in its line of sight, one with σv∼ 223 km/s and another with σv∼ 235 km/s, with a difference in velocity of ∼820 km/s. The main structure is dominated by passive galaxies, while these represent ∼60% of the second structure. The X-ray temperature for the intragroup medium of a group with such a velocity dispersion is expected to be kT ∼0.5-1 keV, against the observed value of kT ∼1.9 keV reported in the literature. This result makes UGC 842 a special case among fossil groups because (1) it represents more likely the interaction between two small groups, which warms the intragroup medium and/or (2) it could constitute evidence that member galaxies lost energy in the process of spiraling toward the group center, and decreased the velocity dispersion of the system. As far as we know, UGC 842 is the first low-mass fossil group studied in detail.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: clusters: individual (UGC 842, NGC 6034) - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: kinematics and dynamics - intergalactic medium

VizieR on-line data: <Available at CDS (J/AJ/139/216): table3.dat table4.dat>

Simbad objects: 141

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Number of rows : 141
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 ACO 168 ClG 01 15 09.8 +00 14 51           ~ 350 2
2 SDSS J011726.91-004700.1 G 01 17 26.925 -00 47 00.14           ~ 4 0
3 2MASX J01174375-0049529 GiC 01 17 43.7367345840 -00 49 53.154744960   16.57   15.32   ~ 7 0
4 SDSS J011745.47-010606.2 G 01 17 45.474 -01 06 06.21           ~ 2 0
5 SDSS J011745.62-010641.5 G 01 17 45.616 -01 06 41.36           ~ 1 0
6 SDSS J011750.18-010727.2 G 01 17 50.185 -01 07 27.21           ~ 1 0
7 SDSS J011758.75-010112.8 G 01 17 58.752 -01 01 12.63           ~ 2 0
8 NAME UGC 842 Group GrG 01 18.0 -01 00           ~ 9 1
9 LEDA 1128058 GiC 01 18 03.0338824560 -01 02 58.180244208           ~ 4 0
10 2MASX J01181438-0052566 EmG 01 18 14.3982244560 -00 52 56.472019248           ~ 7 0
11 SDSS J011818.87-003619.6 G 01 18 18.876 -00 36 19.74           ~ 1 0
12 CAIRNS J011827.77-010131.4 GiC 01 18 27.765 -01 01 31.42           ~ 8 0
13 UGC 837 LIN 01 18 32.2541458368 -01 11 50.430352488   16.5       ~ 13 0
14 LEDA 1129600 G 01 18 37.2999942072 -00 59 24.245322972           ~ 4 0
15 CAIRNS J011840.90-004021.7 GiC 01 18 40.9036169856 -00 40 21.812027700           ~ 4 0
16 6dFGS gJ011853.0-003935 EmG 01 18 52.9994472264 -00 39 35.441811324   16.58   15.26   ~ 16 0
17 UGC 842 BLL 01 18 53.6237165304 -01 00 07.248153600   15.0       ~ 67 1
18 2MASX J01185449-0040594 GiC 01 18 54.4695636120 -00 40 59.581570404   16.63   15.25   ~ 9 0
19 SDSS J011913.43-010503.4 G 01 19 13.4418188280 -01 05 03.419678940           ~ 2 0
20 2MASX J01191347-0108400 EmG 01 19 13.4992321632 -01 08 39.965821188   15.98   14.68   ~ 19 0
21 SDSSCGB 17230.4 G 01 19 16.052 -01 10 40.22           ~ 3 0
22 LAMOST J011932.23-010607.9 G 01 19 32.231 -01 06 07.94           ~ 2 0
23 ACO 181 ClG 01 21 58.3 +00 21 27           ~ 15 0
24 NAME HERCULES SUPERCL SCG 15 47 +18.2           ~ 148 1
25 WBL 601 ClG 16 01.7 +16 21           ~ 2 0
26 2MASX J16015213+1711401 G 16 01 52.090 +17 11 39.74           ~ 3 0
27 MCG+03-41-047 LIN 16 02 04.2765660720 +17 04 33.102295464   14.9       ~ 18 0
28 NVSS J160206+171343 rG 16 02 06.2355258456 +17 13 45.497901792           ~ 4 0
29 SDSS J160206.90+171819.8 G 16 02 06.904 +17 18 19.68           ~ 1 0
30 2MASX J16020802+1727082 GiC 16 02 08.0300449344 +17 27 08.480280060           ~ 2 0
31 SDSS J160210.90+170925.4 G 16 02 10.905 +17 09 25.42           ~ 1 0
32 SDSS J160210.98+172707.1 G 16 02 10.981 +17 27 07.10           ~ 3 0
33 SDSS J160214.96+171557.4 G 16 02 14.963 +17 15 57.39           ~ 1 0
34 NSC J160216+162033 ClG 16 02 16.90 +16 20 32.5           ~ 2 0
35 LEDA 1527999 G 16 02 18.3934818672 +17 14 21.403906656           ~ 2 0
36 SDSS J160219.00+172938.4 BiC 16 02 19.000 +17 29 38.43           ~ 2 0
37 SDSS J160219.24+171134.7 G 16 02 19.2363219768 +17 11 34.666398492           ~ 1 0
38 SDSS J160221.89+170949.3 G 16 02 21.8896515648 +17 09 49.262700384           ~ 1 0
39 SDSS J160227.29+170845.9 G 16 02 27.2952197688 +17 08 45.900957552           ~ 1 0
40 SDSS J160227.48+171313.6 G 16 02 27.4813822056 +17 13 13.576336284           ~ 2 0
41 SDSS J160227.52+172232.3 G 16 02 27.522 +17 22 32.28           ~ 1 0
42 SDSS J160229.59+172700.3 G 16 02 29.595 +17 27 00.27           ~ 1 0
43 SDSS J160230.54+170035.6 G 16 02 30.547 +17 00 35.63           ~ 2 0
44 SDSS J160233.45+170754.4 G 16 02 33.450 +17 07 54.40           ~ 1 0
45 SDSS J160235.55+170136.9 G 16 02 35.555 +17 01 36.88           ~ 1 0
46 SDSS J160242.80+170614.3 G 16 02 42.8075935752 +17 06 14.317314696           ~ 1 0
47 SDSS J160244.90+172159.4 G 16 02 44.904 +17 21 59.40           ~ 1 0
48 2MASX J16024503+1718159 GiC 16 02 45.033 +17 18 15.90   16       ~ 7 0
49 SDSS J160246.95+165916.5 G 16 02 46.952 +16 59 16.53           ~ 1 0
50 LEDA 1526597 GiC 16 02 47.3598604248 +17 10 56.585324964           ~ 3 0
51 2MASX J16024754+1714548 G 16 02 47.552 +17 14 54.95           ~ 4 0
52 LEDA 1526738 G 16 02 49.1143738680 +17 11 20.527854504           ~ 2 0
53 2MASX J16024920+1710028 GiC 16 02 49.2168836424 +17 10 02.670691404   14       ~ 14 0
54 SDSS J160249.29+172228.4 G 16 02 49.274 +17 22 28.90           ~ 1 0
55 2MASX J16025484+1731065 GiC 16 02 54.8636585424 +17 31 06.461725332           ~ 3 0
56 SDSS J160255.92+170348.3 G 16 02 55.918 +17 03 48.39           ~ 3 0
57 LEDA 1528716 G 16 03 01.300 +17 16 09.52           ~ 4 0
58 SDSS J160303.39+171429.1 G 16 03 03.3897031752 +17 14 29.081917464           ~ 2 0
59 SDSS J160304.42+171127.6 G 16 03 04.217 +17 11 26.79           ~ 7 0
60 LEDA 1526857 G 16 03 05.2409029440 +17 11 36.135550680           ~ 6 0
61 LEDA 84703 GiC 16 03 05.726 +17 10 20.37   16       ~ 18 0
62 LEDA 1534888 GiC 16 03 06.683 +17 31 36.44           ~ 4 0
63 LEDA 1533396 GiC 16 03 07.223 +17 27 49.44           ~ 2 0
64 LEDA 1531910 GiC 16 03 07.583 +17 24 12.96           ~ 4 0
65 2MASX J16030785+1717195 LIN 16 03 07.852 +17 17 19.58           ~ 4 0
66 LEDA 1533599 GiC 16 03 10.243 +17 28 18.94           ~ 2 0
67 2MASX J16031413+1722025 GiC 16 03 14.1209535960 +17 22 02.390830716   15       ~ 21 0
68 LEDA 1528002 G 16 03 14.950 +17 14 21.29           ~ 3 0
69 SDSS J160317.65+171101.7 G 16 03 17.6494924776 +17 11 01.725318204           ~ 2 0
70 2MASX J16032265+1703256 GiC 16 03 22.6486347624 +17 03 26.117809308   16       ~ 9 0
71 LEDA 1528998 G 16 03 24.6175505664 +17 16 48.874018260           ~ 3 0
72 SDSS J160327.88+171628.7 G 16 03 27.8845402632 +17 16 28.758349704           ~ 2 0
73 SDSS J160328.00+171146.2 G 16 03 27.9970783680 +17 11 46.216262472           ~ 2 0
74 LEDA 1528801 G 16 03 27.9986410752 +17 16 19.832648988           ~ 3 0
75 LEDA 56871 GiC 16 03 28.0166014056 +17 25 59.407428144   16       ~ 11 0
76 SDSS J160328.93+170930.2 G 16 03 28.931 +17 09 30.24           ~ 2 0
77 SDSS J160330.86+171056.4 G 16 03 30.8628055200 +17 10 56.528278500           ~ 2 0
78 LEDA 1531229 GiC 16 03 30.9404164920 +17 22 26.036360256           ~ 3 0
79 NGC 6034 rG 16 03 32.08333486 +17 11 55.3098953   15.2       ~ 97 1
80 [DKP87] 160117.21+173903.5 GiC 16 03 32.4106367592 +17 30 51.909278616           ~ 2 0
81 2MASX J16033258+1728456 LIN 16 03 32.5847853672 +17 28 45.918604272   15       ~ 15 0
82 LEDA 1526128 G 16 03 33.1817432400 +17 09 47.151340668           ~ 3 0
83 LEDA 1528003 G 16 03 33.4224144672 +17 14 21.608990844           ~ 2 0
84 2MASX J16033424+1657256 G 16 03 34.2751418208 +16 57 25.839940716           ~ 5 0
85 LEDA 1533588 G 16 03 34.380 +17 28 17.66           ~ 4 0
86 SDSS J160334.45+172936.3 G 16 03 34.4562934704 +17 29 36.241671084           ~ 1 0
87 2MASX J16033570+1658417 G 16 03 35.7240037392 +16 58 41.866471812           ~ 3 0
88 WBL 603 ClG 16 03.6 +16 21           ~ 2 0
89 SDSS J160337.57+172527.3 G 16 03 37.5732492816 +17 25 27.420180060           ~ 1 0
90 2MASX J16033924+1711057 GiC 16 03 39.2693161032 +17 11 05.493682140   16       ~ 10 0
91 LEDA 56885 GiC 16 03 40.504 +17 20 16.64   15       ~ 14 0
92 LEDA 1523878 G 16 03 40.8133480056 +17 04 09.889436604           ~ 3 0
93 2MASX J16034286+1718127 GiC 16 03 42.8420406264 +17 18 12.851234568           ~ 4 0
94 SDSS J160343.72+171450.8 G 16 03 43.7223923856 +17 14 50.714733408           ~ 1 0
95 SDSS J160344.27+171750.8 G 16 03 44.271 +17 17 50.87           ~ 2 0
96 LEDA 1529220 G 16 03 44.588 +17 17 19.55           ~ 5 0
97 SDSS J160344.60+172826.5 G 16 03 44.605 +17 28 26.52           ~ 2 0
98 SDSS J160344.88+170808.1 G 16 03 44.875 +17 08 08.14           ~ 3 0
99 SDSS J160345.04+171347.0 G 16 03 45.0457569960 +17 13 46.935955380           ~ 2 0
100 WBL 604 ClG 16 03.8 +17 14           ~ 2 0
101 MCG+03-41-063 LIN 16 03 48.2426452008 +17 14 26.225342124   15.4       ~ 26 0
102 SDSS J160350.67+171529.7 BiC 16 03 50.6711412096 +17 15 29.780087940           ~ 2 0
103 SDSS J160350.71+171421.8 G 16 03 50.7088056840 +17 14 21.780880368           ~ 2 0
104 SDSS J160354.19+173242.7 G 16 03 54.19 +17 32 42.7           ~ 1 0
105 SDSS J160354.42+170308.2 G 16 03 54.4271841024 +17 03 08.319873168           ~ 2 0
106 SDSS J160354.55+170435.2 G 16 03 54.557 +17 04 35.24           ~ 2 0
107 SDSS J160356.30+170639.3 G 16 03 56.3019289176 +17 06 39.448518912           ~ 2 0
108 2MASX J16035667+1718182 GiC 16 03 56.6511411576 +17 18 18.396826704   16       ~ 12 0
109 LEDA 1528012 G 16 03 57.5143705560 +17 14 19.580084520           ~ 3 0
110 [DKP87] 160144.07+174019.3 GiC 16 03 59.2443019344 +17 32 09.447252288           ~ 1 0
111 SDSS J160359.79+172952.2 G 16 03 59.7870363168 +17 29 52.232882676           ~ 1 0
112 USGC U741 GrG 16 03 59.8 +16 46 45           ~ 2 0
113 LEDA 1534696 G 16 04 00.0690516552 +17 31 04.066462128           ~ 3 0
114 SDSS J160400.17+173115.6 G 16 04 00.1685635176 +17 31 15.553340652           ~ 1 0
115 2MASX J16040033+1733172 GiC 16 04 00.3089586168 +17 33 17.506939464   16       ~ 9 0
116 SDSS J160401.12+172839.4 GiC 16 04 01.129 +17 28 39.50           ~ 1 0
117 LEDA 1525562 G 16 04 01.430 +17 08 20.40           ~ 3 0
118 MCG+03-41-067 GiC 16 04 02.7529004688 +17 16 56.579041632   15.7       ~ 21 0
119 SDSS J160405.47+171314.7 G 16 04 05.472 +17 13 14.76           ~ 3 0
120 SDSS J160407.17+171410.6 G 16 04 07.176 +17 14 10.64           ~ 2 0
121 SDSS J160407.55+171224.8 G 16 04 07.557 +17 12 24.84           ~ 3 0
122 [DKP87] 160153.00+173900.4 GiC 16 04 08.2153280064 +17 30 51.170328396           ~ 1 0
123 SDSS J160418.17+171627.8 G 16 04 18.169 +17 16 27.87           ~ 1 0
124 2MASX J16042033+1726113 GiC 16 04 20.3574593472 +17 26 11.270209020   16       ~ 14 0
125 2MASX J16042591+1725431 GiC 16 04 25.9533911112 +17 25 43.133117520           ~ 1 0
126 SDSS J160427.24+170203.4 G 16 04 27.2472382128 +17 02 03.448938984           ~ 1 0
127 2MASX J16042794+1721481 GiC 16 04 27.9826402008 +17 21 48.034037664           ~ 4 0
128 SDSS J160428.03+171317.1 G 16 04 28.035 +17 13 17.07           ~ 1 0
129 SDSS J160428.44+171319.8 G 16 04 28.451 +17 13 19.92           ~ 2 0
130 SDSS J160429.13+172116.8 G 16 04 29.13 +17 21 16.8           ~ 1 0
131 MCG+03-41-072 GiC 16 04 30.4247082960 +17 28 08.996785500   15       ~ 47 0
132 SDSS J160434.80+172638.0 G 16 04 34.810 +17 26 38.01           ~ 1 0
133 SDSS J160436.01+171739.9 G 16 04 36.0133657176 +17 17 39.837582276           ~ 1 0
134 2MASX J16043744+1718252 GiC 16 04 37.4406559248 +17 18 24.947077284           ~ 4 0
135 WBL 606 ClG 16 04.7 +16 33           ~ 2 0
136 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 572 3
137 [BDB95] A2151C ClG 16 05 15.5 +17 39 45           ~ 3 0
138 ACO 2152 ClG 16 05 22.4 +16 26 55           ~ 159 0
139 WBL 607 ClG 16 05.4 +17 54           ~ 2 0
140 [BDB95] A2151N ClG 16 05 55.0 +18 08 27           ~ 4 0
141 [BDB95] A2151E ClG 16 06 44.2 +17 46 13           ~ 4 0

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2023.02.06-06:55:39

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