2009A&A...501..419B

Query : 2009A&A...501..419B

2009A&A...501..419B - Astronomy and Astrophysics, volume 501419-427 (2009/7-2)

The orbital velocity anisotropy of cluster galaxies: evolution.

BIVIANO A. and POGGIANTI B.M.

Abstract (from CDS):

In nearby clusters early-type galaxies follow isotropic orbits. The orbits of late-type galaxies are instead characterized by slightly radial anisotropy. Little is known about the orbits of the different populations of cluster galaxies at redshift z>0.3. We investigate the redshift evolution of the orbits of cluster galaxies.We use two samples of galaxy clusters spanning similar (evolutionary corrected) mass ranges at different redshifts. The sample of low-redshift (z∼0.0-0.1) clusters is extracted from the ESO Nearby Abell Cluster Survey (ENACS) catalog. The sample of high-redshift (z∼0.4-0.8) clusters is mostly made of clusters from the ESO Distant Cluster Survey (EDisCS). For each of these samples, we solve the Jeans equation for hydrostatic equilibrium separately for two cluster galaxy populations, characterized by the presence and, respectively, absence of emission-lines in their spectra (``ELGs'' and ``nELGs'' hereafter). Using two tracers of the gravitational potential allows to partially break the mass-anisotropy degeneracy which plagues these kinds of analyses.We confirm earlier results for the nearby cluster sample. The mass profile is well fitted by a Navarro, Frenk & White (NFW) profile with concentration c=4. The mass profile of the distant cluster sample is also well fitted by a NFW profile, but with a slightly lower concentration, as predicted by cosmological simulations of cluster-sized halos. While the mass density profile becomes less concentrated with redshift, the number density profile of nELGs becomes more concentrated with redshift. In nearby clusters, the velocity anisotropy profile of nELGs is close to isotropic, while that of ELGs is increasingly radial with clustercentric radius. In distant clusters the projected phase-space distributions of both nELGs and ELGs are best-fitted by models with radial velocity anisotropy.No significant evolution is detected for the orbits of ELGs, while the orbits of nELGs evolve from radial to isotropic with time. We speculate that this evolution may be driven by the secular mass growth of galaxy clusters during their fast accretion phase. Cluster mass density profiles and their evolution with redshift are consistent with predictions for cluster-sized halos in Λ Cold Dark Matter cosmological simulations. The evolution of the nELG number density profile is opposite to that of the mass density profile, becoming less concentrated with time, probably a result of the transformation of ELGs into nELGs.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: kinematics and dynamics

Simbad objects: 77

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Number of rows : 77
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 2734 ClG 00 11 21.60 -28 51 16.6           ~ 156 0
2 ACO 13 ClG 00 13 38.5 -19 30 19           ~ 107 1
3 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 648 1
4 ACO 2799 ClG 00 37 28.1 -39 08 59           ~ 40 0
5 ACO 2800 ClG 00 37 58 -25 05.5           ~ 41 0
6 ACO 87 ClG 00 43 01 -09 47.6           ~ 46 0
7 ACO 2819 ClG 00 45 51.1 -63 34 42           ~ 34 1
8 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
9 ACO 151 ClG 01 08 52.3 -15 25 01           ~ 199 1
10 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
11 ACO 2911 ClG 01 26 12.9 -37 56 22           ~ 63 0
12 ACO 295 ClG 02 02 27 -01 04.6           ~ 67 0
13 ClG 0303+17 ClG 03 06 19.0 +17 18 50           ~ 49 0
14 ACO 3093 ClG 03 10 52.0 -47 23 43           ~ 34 0
15 ACO 3094 ClG 03 11 25.00 -26 55 52.2           ~ 64 0
16 ACO 3111 ClG 03 17 49.3 -45 42 24           ~ 38 0
17 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
18 ACO 3122 ClG 03 22 10.9 -41 20 15           ~ 62 0
19 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
20 ACO 3151 ClG 03 40 27.2 -28 40 20           ~ 45 0
21 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
22 ACO 3194 ClG 03 59 12 -30 10.5           ~ 28 0
23 ACO 3202 ClG 04 00 14 -53 39.6           ~ 28 0
24 ACO 3223 ClG 04 08 34.5 -30 49 08           ~ 59 2
25 ACO 514 ClG 04 48 18 -20 28.7           ~ 149 0
26 ACO 524 ClG 04 57.8 -19 43           ~ 25 0
27 ACO 3341 ClG 05 25 31.859 -31 35 56.05           ~ 57 0
28 ACO 3354 ClG 05 34 39 -28 30.1           ~ 22 0
29 ACO 548 ClG 05 47 01.7 -25 36 59           B8 209 2
30 ACO 3365 ClG 05 48 12 -21 56.1           ~ 41 0
31 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
32 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
33 ACO 957 ClG 10 14 02.35 -00 53 30.0           ~ 225 2
34 ClG J1018-1211 ClG 10 18 46.45 -12 11 52.8     20.35     ~ 30 0
35 ACO 978 ClG 10 20 26.66 -06 31 37.5           ~ 126 1
36 ClG J1037-1243 ClG 10 37 52.6 -12 43 44           ~ 41 0
37 ACO 1069 ClG 10 39 54.3 -08 36 40           ~ 116 1
38 ClG J1040-1155 ClG 10 40 41.6 -11 55 51           ~ 57 0
39 ClG J1054-1146 ClG 10 54 24.2 -11 46 18           ~ 54 0
40 ClG J1054-1245 ClG 10 54 43.5 -12 45 50           ~ 55 0
41 ClG J1059-1253 ClG 10 59 09.5 -12 53 15           ~ 28 0
42 ClG J1103-1245 ClG 11 03 42.9 -12 45 18           ~ 18 1
43 ClG J1119-1129 ClG 11 19 16.5 -11 29 33           ~ 20 0
44 ClG J1138-1133 ClG 11 38 10.3 -11 33 59           ~ 46 0
45 ClG J1202-1224 ClG 12 02 43.1 -12 24 31           ~ 26 0
46 ClG J1216-1201 ClG 12 16 45.10 -12 01 17.3           ~ 71 0
47 ClG J1227-1138 ClG 12 27 53.9 -11 38 20           ~ 47 0
48 ClG J1232-1250 ClG 12 32 30.5 -12 50 33           ~ 51 0
49 ACO 3528 ClG 12 54 18.2 -29 01 16           ~ 166 1
50 ClG J1301-1138 ClG 13 01 40.1 -11 39 24           ~ 21 0
51 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
52 ACO 3559 ClG 13 29 53.9 -29 31 29           ~ 74 0
53 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
54 ClG J1353-1137 ClG 13 53 01.0 -11 37 31           ~ 27 0
55 ACO 1809 ClG 13 53 07.68 +05 08 32.7           ~ 179 0
56 ClG J1354-1230 ClG 13 54 09.5 -12 30 59           ~ 47 0
57 ClG J1411-1148 ClG 14 11 03.9 -11 48 22           ~ 32 0
58 ClG J1420-1236 ClG 14 20 19.4 -12 36 36           ~ 25 0
59 ACO 2040 ClG 15 12 44.00 +07 27 34.5           ~ 144 1
60 ACO 2048 ClG 15 15 14.11 +04 23 10.4           ~ 109 0
61 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
62 ClG 1601+42 ClG 16 03 13.800 +42 45 36.00           ~ 50 0
63 ACO 3651 ClG 19 52 10.9 -55 05 16           ~ 74 0
64 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
65 ACO 3691 ClG 20 34 08.03 -38 01 45.5           ~ 20 0
66 ACO 3705 ClG 20 41 47.1 -35 10 30           ~ 47 0
67 ACO 3764 ClG 21 25 55.1 -34 43 28           ~ 28 0
68 ACO 2361 ClG 21 39 07 -14 19.4           ~ 35 0
69 ACO 3806 ClG 21 46 37.9 -57 17 07           ~ 59 0
70 ACO 3822 ClG 21 54 06.2 -57 50 49           ~ 98 0
71 ACO 3825 ClG 21 58 22.4 -60 23 39           ~ 66 0
72 ACO 2401 ClG 21 58 22.6 -20 06 13           ~ 71 0
73 ACO 3827 ClG 22 01 49.1 -59 57 15           ~ 178 0
74 ACO 3879 ClG 22 27.8 -69 02           ~ 29 0
75 ACO 3921 ClG 22 49 59.0 -64 25 48           ~ 165 1
76 ACO 2569 ClG 23 17 54 -12 51.6           ~ 31 0
77 ACO 4010 ClG 23 31 10.3 -36 30 26           ~ 63 0

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