2011A&A...527A.143A

Query : 2011A&A...527A.143A

2011A&A...527A.143A - Astronomy and Astrophysics, volume 527A, 143-143 (2011/3-1)

Fossil groups origins. I. RX J105453.3+552102 a very massive and relaxed system at z∼0.5.

AGUERRI J.A.L., GIRARDI M., BOSCHIN W., BARRENA R., MENDEZ-ABREU J., SANCHEZ-JANSSEN R., BORGANI S., CASTRO-RODRIGUEZ N., CORSINI E.M., DEL BURGO C., D'ONGHIA E., IGLESIAS-PARAMO J., NAPOLITANO N. and VILCHEZ J.M.

Abstract (from CDS):

The most accepted scenario for the origin of fossil groups is that they are galaxy associations in which the merging rate was fast and efficient. These systems have assembled half of their mass at early epoch of the Universe, subsequently growing by minor mergers, and therefore could contain a fossil record of the galaxy structure formation. We have started an observational project in order to characterize a large sample of fossil groups. In this paper we present the analysis of the fossil system RX J105453.3+552102.Optical deep images were used for studying the properties of the brightest group galaxy and for computing the photometric luminosity function of the group. We have also performed a detail dynamical analysis of the system based on redshift data for 116 galaxies. Combining galaxy velocities and positions we selected 78 group members.RX J105453.3+552102 is located at <z≥0.47, and shows a quite large line-of-sight velocity dispersion σv∼1000 km/s. Assuming the dynamical equilibrium, we estimated a virial mass of M(<R200)∼1x1015h70–1M☉. No evidence of substructure was found within 1.4 Mpc radius. Nevertheless, we found a statistically significant departure from Gaussianity of the group members velocities in the most external regions of the group. This could indicate the presence of galaxies in radial orbits in the external region of the group. We also found that the photometrical luminosity function is bimodal, showing a lack of Mr~-19.5 galaxies. The brightest group galaxy shows low Sersic parameter (n∼2) and a small peculiar velocity. Indeed, our accurate photometry shows that the difference between the brightest and the second brightest galaxies is 1.9mag in the r-band, while the classical definition of fossil group is based on a magnitude gap of 2. We conclude that RX J105453.3+552102 does not follow the empirical definition of fossil group. Nevertheless, it is a massive, old and undisturbed galaxy system with little infall of L* galaxies since its initial collapse.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: RX J105453.3+552102 - galaxies: groups: general - galaxies: kinematics and dynamics - galaxies: luminosity function, mass function - galaxies: elliptical and lenticular, cD - galaxies: evolution

VizieR on-line data: <Available at CDS (J/A+A/527/A143): table1.dat>

Simbad objects: 120

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Number of rows : 120
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 SDSS J105425.15+552103.0 G 10 54 25.153 +55 21 02.89           ~ 1 0
2 SDSS J105427.11+552247.4 G 10 54 27.112 +55 22 47.21           ~ 1 0
3 SDSS J105428.19+552058.0 G 10 54 28.192 +55 20 57.85           ~ 1 0
4 SDSS J105428.47+552123.4 G 10 54 28.475 +55 21 23.23           ~ 1 0
5 SDSS J105429.56+551955.6 G 10 54 29.554 +55 19 55.42           ~ 1 0
6 SDSS J105430.42+552116.5 G 10 54 30.417 +55 21 16.39           ~ 1 0
7 SDSS J105431.81+552224.2 G 10 54 31.812 +55 22 24.05           ~ 1 0
8 SDSS J105433.07+552345.3 G 10 54 33.073 +55 23 45.09           ~ 1 0
9 SDSS J105433.47+552153.9 G 10 54 33.474 +55 21 53.71           ~ 1 0
10 SDSS J105433.59+552315.0 G 10 54 33.595 +55 23 14.85           ~ 1 0
11 SDSS J105434.56+552233.6 GiC 10 54 34.562 +55 22 33.46           ~ 2 0
12 SDSS J105434.76+552052.0 G 10 54 34.758 +55 20 51.85           ~ 1 0
13 SDSS J105435.18+552057.1 GiC 10 54 35.184 +55 20 56.93           ~ 2 0
14 SDSS J105435.48+551849.1 G 10 54 35.476 +55 18 48.95           ~ 1 0
15 SDSS J105438.24+552217.1 GiC 10 54 38.237 +55 22 16.94           ~ 2 0
16 SDSS J105438.39+551806.2 G 10 54 38.389 +55 18 06.04           ~ 1 0
17 SDSS J105438.83+552019.8 G 10 54 38.835 +55 20 19.66           ~ 1 0
18 SDSS J105438.84+552311.4 G 10 54 38.842 +55 23 11.24           ~ 1 0
19 SDSS J105439.21+552108.2 G 10 54 39.207 +55 21 08.07           ~ 1 0
20 SDSS J105439.78+552155.3 G 10 54 39.777 +55 21 55.16           ~ 1 0
21 SDSS J105440.08+551840.2 G 10 54 40.076 +55 18 40.03           ~ 1 0
22 SDSS J105440.09+552056.2 GiC 10 54 40.094 +55 20 56.00           ~ 2 0
23 SDSS J105440.50+552316.0 G 10 54 40.504 +55 23 15.79           ~ 1 0
24 SDSS J105440.70+552157.4 GiC 10 54 40.708 +55 21 57.45           ~ 2 0
25 SDSS J105442.08+551903.3 G 10 54 42.08 +55 19 03.3           ~ 1 0
26 SDSS J105442.56+552022.8 G 10 54 42.566 +55 20 22.62           ~ 1 0
27 SDSS J105442.80+551922.5 GiC 10 54 42.807 +55 19 22.59           ~ 2 0
28 SDSS J105442.93+552008.2 GiC 10 54 42.936 +55 20 08.20           ~ 2 0
29 SDSS J105443.61+552026.8 GiC 10 54 43.611 +55 20 26.63           ~ 2 0
30 SDSS J105444.08+552059.4 GiC 10 54 44.075 +55 20 59.22           ~ 2 0
31 SDSS J105444.19+552311.9 G 10 54 44.196 +55 23 11.66           ~ 1 0
32 SDSS J105444.90+552211.2 GiC 10 54 44.901 +55 22 10.98           ~ 2 0
33 SDSS J105445.14+552044.4 G 10 54 45.140 +55 20 44.22           ~ 1 0
34 SDSS J105445.26+552422.2 G 10 54 45.262 +55 24 21.96           ~ 1 0
35 SDSS J105445.51+552005.6 GiC 10 54 45.507 +55 20 05.37           ~ 2 0
36 SDSS J105445.53+552233.3 G 10 54 45.534 +55 22 33.12           ~ 1 0
37 SDSS J105446.25+552231.8 GiC 10 54 46.252 +55 22 31.63           ~ 2 0
38 SDSS J105446.34+551919.6 G 10 54 46.338 +55 19 19.44           ~ 1 0
39 SDSS J105446.60+552400.7 G 10 54 46.607 +55 24 00.52           ~ 1 0
40 SDSS J105446.82+552104.1 GiC 10 54 46.823 +55 21 03.87           ~ 2 0
41 SDSS J105447.04+551825.6 G 10 54 47.037 +55 18 25.47           ~ 1 0
42 SDSS J105447.26+552340.4 G 10 54 47.266 +55 23 40.16           ~ 1 0
43 SDSS J105447.65+552140.2 GiC 10 54 47.656 +55 21 40.21           ~ 2 0
44 SDSS J105447.87+552111.4 GiC 10 54 47.872 +55 21 11.40           ~ 2 0
45 SDSS J105448.05+552105.8 G 10 54 48.057 +55 21 05.59           ~ 1 0
46 SDSS J105448.29+552129.1 GiC 10 54 48.291 +55 21 28.86           ~ 2 0
47 SDSS J105448.49+552106.3 G 10 54 48.491 +55 21 06.35           ~ 1 0
48 SDSS J105448.78+551757.0 G 10 54 48.785 +55 17 56.85           ~ 1 0
49 SDSS J105449.61+552148.0 GiC 10 54 49.615 +55 21 47.78           ~ 2 0
50 SDSS J105449.69+551921.9 G 10 54 49.689 +55 19 21.75           ~ 1 0
51 SDSS J105449.71+552006.4 GiC 10 54 49.716 +55 20 06.17           ~ 2 0
52 SDSS J105450.31+552117.3 GiC 10 54 50.316 +55 21 17.13           ~ 2 0
53 SDSS J105450.37+552229.2 GiC 10 54 50.375 +55 22 28.96           ~ 2 0
54 SDSS J105451.15+551822.7 G 10 54 51.152 +55 18 22.54           ~ 1 0
55 SDSS J105451.20+552205.2 GiC 10 54 51.201 +55 22 05.28           ~ 2 0
56 SDSS J105451.56+552036.4 G 10 54 51.56 +55 20 36.4           ~ 1 0
57 SDSS J105451.93+552058.8 G 10 54 51.933 +55 20 58.60           ~ 1 0
58 PSZ1 G151.62+54.78 ClG 10 54 52.0 +55 21 12           ~ 21 0
59 NVSS J105452+552111 rG 10 54 52.024 +55 21 12.25           ~ 12 2
60 SDSS J105452.17+552126.9 GiC 10 54 52.170 +55 21 26.94           ~ 2 0
61 SDSS J105452.57+552111.6 G 10 54 52.578 +55 21 11.69           ~ 1 0
62 SDSS J105452.80+552426.3 G 10 54 52.798 +55 24 26.13           ~ 1 0
63 SDSS J105452.97+551732.7 G 10 54 52.971 +55 17 32.47           ~ 1 0
64 SDSS J105453.22+551747.6 G 10 54 53.220 +55 17 47.41           ~ 1 0
65 SDSS J105453.25+551911.8 GiC 10 54 53.253 +55 19 11.63           ~ 2 0
66 SDSS J105453.81+552122.4 GiC 10 54 53.817 +55 21 22.42           ~ 2 0
67 SDSS J105453.92+552207.9 GiC 10 54 53.925 +55 22 07.73           ~ 2 0
68 SDSS J105454.00+552129.2 GiC 10 54 53.998 +55 21 28.97           ~ 2 0
69 SDSS J105454.06+552055.2 GiC 10 54 54.065 +55 20 54.97           ~ 2 0
70 SDSS J105454.37+552322.4 G 10 54 54.380 +55 23 22.26           ~ 1 0
71 SDSS J105454.43+552332.2 G 10 54 54.432 +55 23 31.98           ~ 1 0
72 SDSS J105454.43+552255.9 GiC 10 54 54.438 +55 22 55.94           ~ 2 0
73 SDSS J105454.52+552153.2 G 10 54 54.524 +55 21 52.99           ~ 1 0
74 SDSS J105454.57+552316.1 G 10 54 54.576 +55 23 15.88           ~ 1 0
75 SDSS J105455.24+552229.6 GiC 10 54 55.239 +55 22 29.35           ~ 2 0
76 SDSS J105455.24+552348.5 GiC 10 54 55.244 +55 23 48.51           ~ 2 0
77 SDSS J105455.35+552106.4 GiC 10 54 55.347 +55 21 06.20           ~ 2 0
78 SDSS J105456.23+552132.3 G 10 54 56.231 +55 21 32.09           ~ 1 0
79 SDSS J105456.24+552119.5 GiC 10 54 56.239 +55 21 19.33           ~ 2 0
80 SDSS J105456.36+551938.0 G 10 54 56.358 +55 19 37.83           ~ 1 0
81 SDSS J105456.47+552106.1 G 10 54 56.475 +55 21 05.93           ~ 1 0
82 SDSS J105456.63+552252.9 GiC 10 54 56.633 +55 22 52.70           ~ 2 0
83 SDSS J105456.65+551850.3 G 10 54 56.646 +55 18 50.05           ~ 1 0
84 SDSS J105456.67+552056.2 G 10 54 56.676 +55 20 55.98           ~ 1 0
85 SDSS J105456.70+552100.2 GiC 10 54 56.710 +55 21 00.22           ~ 2 0
86 SDSS J105457.29+552132.0 GiC 10 54 57.291 +55 21 31.80           ~ 2 0
87 SDSS J105458.04+552004.3 G 10 54 58.039 +55 20 04.09           ~ 1 0
88 SDSS J105459.02+552059.6 GiC 10 54 59.024 +55 20 59.37           ~ 2 0
89 SDSS J105459.80+551943.5 G 10 54 59.797 +55 19 43.28           ~ 1 0
90 SDSS J105502.36+552222.5 GiC 10 55 02.360 +55 22 22.23           ~ 2 0
91 SDSS J105502.56+552428.4 G 10 55 02.564 +55 24 28.13           ~ 1 0
92 SDSS J105502.82+552301.6 G 10 55 02.820 +55 23 01.38           ~ 1 0
93 SDSS J105502.88+552145.9 G 10 55 02.885 +55 21 45.62           ~ 1 0
94 SDSS J105503.17+551941.3 GiC 10 55 03.176 +55 19 41.10           ~ 2 0
95 SDSS J105503.87+552154.0 GiC 10 55 03.869 +55 21 53.76           ~ 2 0
96 SDSS J105503.87+552108.2 GiC 10 55 03.874 +55 21 08.23           ~ 2 0
97 SDSS J105504.35+551923.6 G 10 55 04.350 +55 19 23.39           ~ 1 0
98 SDSS J105505.49+552034.1 G 10 55 05.493 +55 20 33.86           ~ 1 0
99 SDSS J105505.57+552245.3 G 10 55 05.568 +55 22 45.09           ~ 1 0
100 SDSS J105506.15+551914.6 G 10 55 06.153 +55 19 14.35           ~ 1 0
101 SDSS J105506.18+551858.4 G 10 55 06.185 +55 18 58.12           ~ 1 0
102 SDSS J105506.23+552257.7 G 10 55 06.233 +55 22 57.49           ~ 1 0
103 SDSS J105506.84+552306.3 G 10 55 06.847 +55 23 06.04           ~ 1 0
104 SDSS J105508.66+552121.8 GiC 10 55 08.658 +55 21 21.52           ~ 2 0
105 SDSS J105509.72+552102.0 G 10 55 09.723 +55 21 01.71           ~ 1 0
106 SDSS J105510.66+552253.3 G 10 55 10.664 +55 22 53.00           ~ 1 0
107 SDSS J105510.89+552323.3 G 10 55 10.896 +55 23 23.07           ~ 1 0
108 SDSS J105511.18+552255.8 G 10 55 11.178 +55 22 55.57           ~ 1 0
109 SDSS J105511.57+552100.4 G 10 55 11.572 +55 21 00.11           ~ 1 0
110 SDSS J105513.08+552315.2 G 10 55 13.083 +55 23 14.89           ~ 1 0
111 SDSS J105513.63+552103.5 G 10 55 13.637 +55 21 03.22           ~ 1 0
112 SDSS J105514.05+551952.9 G 10 55 14.053 +55 19 52.69           ~ 1 0
113 SDSS J105515.13+552058.8 G 10 55 15.134 +55 20 58.58           ~ 1 0
114 SDSS J105515.94+552058.7 G 10 55 15.947 +55 20 58.39           ~ 1 0
115 SDSS J105516.06+551945.9 G 10 55 16.060 +55 19 45.62           ~ 1 0
116 SDSS J105516.15+552030.8 GiC 10 55 16.157 +55 20 30.51           ~ 2 0
117 SDSS J105517.30+552108.0 GiC 10 55 17.3051273736 +55 21 07.805376216           ~ 2 0
118 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4793 2
119 RX J1340.6+4018 G 13 40 33.4 +40 17 48           ~ 41 1
120 NAME Local Group GrG ~ ~           ~ 8382 0

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