2015A&A...575A..48S

Query : 2015A&A...575A..48S

2015A&A...575A..48S - Astronomy and Astrophysics, volume 575A, 48-48 (2015/3-1)

Constraints on the alignment of galaxies in galaxy clusters from ∼14000 spectroscopic members.

SIFON C., HOEKSTRA H., CACCIATO M., VIOLA M., KOEHLINGER F., VAN DER BURG R.F.J., SAND D.J. and GRAHAM M.L.

Abstract (from CDS):

Torques acting on galaxies lead to physical alignments, but the resulting ellipticity correlations are difficult to predict. As they constitute a major contaminant for cosmic shear studies, it is important to constrain the intrinsic alignment signal observationally. We measured the alignments of satellite galaxies within 90 massive galaxy clusters in the redshift range 0.05<z<0.55 and quantified their impact on the cosmic shear signal. We combined a sample of 38104 galaxies with spectroscopic redshifts with high-quality data from the Canada-France-Hawaii Telescope. We used phase-space information to select 14576 cluster members, 14250 of which have shape measurements and measured three different types of alignment: the radial alignment of satellite galaxies toward the brightest cluster galaxies (BCGs), the common orientations of satellite galaxies and BCGs, and the radial alignments of satellites with each other. Residual systematic effects are much smaller than the statistical uncertainties. We detect no galaxy alignment of any kind out to at least 3r200. The signal is consistent with zero for both blue and red galaxies, bright and faint ones, and also for subsamples of clusters based on redshift, dynamical mass, and dynamical state. These conclusions are unchanged if we expand the sample with bright cluster members from the red sequence. We augment our constraints with those from the literature to estimate the importance of the intrinsic alignments of satellites compared to those of central galaxies, for which the alignments are described by the linear alignment model. Comparison of the alignment signals to the expected uncertainties of current surveys such as the Kilo-Degree Survey suggests that the linear alignment model is an adequate treatment of intrinsic alignments, but it is not clear whether this will be the case for larger surveys.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: general - galaxies: interactions - gravitational lensing: weak - cosmology: observations

VizieR on-line data: <Available at CDS (J/A+A/575/A48): table2.dat refs.dat>

Simbad objects: 92

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Number of rows : 92
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 ACO 2703 ClG 00 05 29.30 +16 12 23.5           ~ 52 0
2 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 502 0
3 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 635 1
4 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 909 0
5 ACO 115 ClG 00 55 59.5 +26 19 14           ~ 270 1
6 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 555 2
7 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 368 1
8 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 295 0
9 ACO 222 ClG 01 37 31.1 -12 59 30           ~ 140 1
10 ACO 223 ClG 01 37 55.9 -12 49 11           ~ 122 1
11 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 229 0
12 ACO 383 ClG 02 48 03.3915 -03 31 45.228           ~ 359 0
13 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 396 0
14 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 566 0
15 ClG 0440+02 ClG 04 43 09.7 +02 10 19     17.03     ~ 125 0
16 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 249 0
17 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 436 0
18 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 352 0
19 ACO 545 ClG 05 32 24.4152 -11 32 35.080           ~ 97 0
20 ACO 553 ClG 06 12 25.8 +48 37 26           ~ 47 0
21 ZwCl 0628+2502 ClG 06 31 21.4 +25 00 58           ~ 23 0
22 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 463 0
23 B3 0714+378 Rad 07 17 36.6 +37 45 01           ~ 170 2
24 ACO 586 ClG 07 32 20.3 +31 37 58           ~ 180 0
25 RX J0736.6+3924 ClG 07 36.6 +39 24           ~ 3 0
26 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 225 0
27 ACO 646 ClG 08 22 10.0 +47 05 58           ~ 99 1
28 ACO 655 ClG 08 25 16.12 +47 09 34.2           ~ 107 0
29 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 253 0
30 ACO 754 ClG 09 09 08.4 -09 39 58           ~ 666 1
31 ACO 780 ClG 09 18 30 -12 15.7           ~ 453 0
32 ACO 795 ClG 09 24 11.26 +14 09 03.5           ~ 103 0
33 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 327 0
34 ClG 1008-12 ClG 10 10 34.1 -12 39 48     18.0     ~ 152 0
35 ACO 961 ClG 10 16 39.24 +33 39 44.4           ~ 49 0
36 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 400 0
37 ACO 959 ClG 10 17 35.0 +59 33 28           ~ 68 0
38 ACO 990 ClG 10 23 39.46 +49 08 19.6           ~ 79 0
39 ZwCl 1023+1257 ClG 10 25 55.9 +12 41 07           ~ 48 0
40 ACO 1033 ClG 10 31 39.78 +35 05 34.4           ~ 82 0
41 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 214 0
42 ACO 1132 ClG 10 58 32.05 +56 47 14.2           ~ 129 1
43 ACO 1234 ClG 11 22 30.000 +21 24 22.00           ~ 38 0
44 ACO 1246 ClG 11 23 57.4 +21 29 14           ~ 106 0
45 ACO 1285 ClG 11 30 25.4 -14 33 33           ~ 60 0
46 ACO 1361 ClG 11 43 45.85 +46 20 51.8           ~ 92 0
47 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 430 0
48 ZwCl 1215+0400 ClG 12 17 43.62 +03 38 51.5           ~ 153 0
49 ClG 1224+20 ClG 12 27 14.9 +19 51 06   19.0       ~ 95 0
50 ClG 1231.3+1542 ClG 12 33 55.3 +15 25 58     18.5     ~ 52 0
51 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 304 0
52 ACO 1651 ClG 12 59 22.43 -04 11 47.1           ~ 290 0
53 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1125 0
54 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 251 2
55 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 312 0
56 ACO 1781 ClG 13 45 32.70 +29 31 49.6           ~ 66 0
57 ACO 1795 ClG 13 48 50.48 +26 35 07.4           ~ 1267 0
58 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 361 0
59 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 688 1
60 ACO 1914 ClG 14 26 03.32 +37 49 58.7           ~ 314 0
61 ACO 1927 ClG 14 31 06.80 +25 38 01.3           ~ 99 0
62 ACO 1942 ClG 14 38 21.8673 +03 40 13.247           ~ 118 0
63 ACO 1991 ClG 14 54 41.53 +18 38 08.4           ~ 330 1
64 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 294 0
65 ACO 2029 ClG 15 10 56.2 +05 44 42           ~ 943 0
66 ACO 2033 ClG 15 11 23.50 +06 19 08.4           ~ 93 0
67 ClG J1514+3636 ClG 15 14 22.0 +36 36 22     19.0     ~ 136 0
68 ACO 2050 ClG 15 16 18.7 +00 05 31           ~ 113 0
69 ACO 2055 ClG 15 18 46.29 +06 13 42.9           ~ 107 0
70 ACO 2064 ClG 15 20 59.4 +48 38 17           ~ 50 0
71 ACT-CL J1521.8+0742 ClG 15 21 55.14 +07 41 27.2     15.13     ~ 311 0
72 ACO 2065 ClG 15 22 29.3 +27 42 22           ~ 374 0
73 ACO 2069 ClG 15 24 02.92 +29 53 20.3           ~ 143 0
74 ACO 2111 ClG 15 39 40.9 +34 25 04           ~ 180 0
75 ACO 2104 ClG 15 40 06.8 -03 17 39           ~ 107 0
76 ACO 2125 ClG 15 41 14.1 +66 15 57           ~ 122 1
77 ACO 2142 ClG 15 58 14.38 +27 12 57.8           ~ 768 0
78 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 562 0
79 ClG 1621+26 ClG 16 23 35.7 +26 33 50           ~ 142 0
80 ACO 2199 ClG 16 28 43.31 +39 34 07.6           ~ 1171 1
81 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 436 0
82 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 359 0
83 ACO 2259 ClG 17 20 09.2 +27 40 09           ~ 117 0
84 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 342 0
85 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 461 1
86 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 688 2
87 ACO 2409 ClG 22 00 52.7 +20 58 27           ~ 84 0
88 ACO 2440 ClG 22 23 52.6 -01 35 47           ~ 125 1
89 ACO 2495 ClG 22 50 17.10 +10 55 01.2           ~ 77 0
90 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 137 0
91 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 539 0
92 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 352 0

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