Constraints on the alignment of galaxies in galaxy clusters from ~14 000 spectroscopic members

Cristóbal Sifón; Henk Hoekstra; Marcello Cacciato; Massimo Viola; Fabian Köhlinger; Remco F. J. van der Burg; David J. Sand; Melissa L. Graham

doi:10.1051/0004-6361/201424435

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Volume 575 (March 2015)

A&A, 575 (2015) A48

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Table 3

Average ellipticity components of spectroscopic members.

		KSB				GALFIT

Sample	N _gal ^a	⟨ ϵ₊ ⟩	⟨ ϵ_× ⟩	σ(ϵ_i) ^b	N _gal ^a	⟨ ϵ₊ ⟩	⟨ ϵ_× ⟩	σ(ϵ_i) ^b

All	8510	−0.0037	−0.0014	0.0027	8014	0.0004	−0.0009	0.0031
z< 0.14	4170	0.0002	0.0000	0.0039	4612	0.0029	−0.0003	0.0038
z ≥ 0.14	4340	−0.0074	−0.0027	0.0038	3402	−0.0042	−0.0020	0.0053
M₂₀₀< 7 × 10¹⁴ M_⊙	2287	−0.0059	0.0051	0.0052	2277	−0.0057	0.0041	0.0057
M₂₀₀ ≥ 7 × 10¹⁴ M_⊙	6223	−0.0029	−0.0038	0.0032	5737	0.0030	−0.0030	0.0037
Relaxed	3233	−0.0037	−0.0022	0.0044	3058	−0.0038	−0.0025	0.0050
Disturbed	5277	−0.0036	−0.0009	0.0034	4956	0.0031	0.0001	0.0040
M_r ≤ −21	4101	−0.0031	−0.0016	0.0039	3922	0.0009	0.0000	0.0044
M_r> − 21	4409	−0.0042	−0.0012	0.0038	4092	−0.0001	−0.0018	0.0044
RS	5806	−0.0008	−0.0009	0.0033	5595	0.0010	−0.0001	0.0037
Non-RS	2704	−0.0099	−0.0025	0.0048	2419	−0.0012	−0.0031	0.0059

Notes.

^(a)

Number of galaxies used for the average, within r₂₀₀.

^(b)

68% confidence measurement uncertainties on the average ellipticities.

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