The X-ray/SZ view of the virial region - II. Gas mass fraction

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Table 1

Mean f_gas values and intrinsic scatter σ_f (in percent) obtained from various datasets and at different overdensity radii.

Dataset	f_gas,2500	σ_f,2500	f_gas,1000	σ_f,1000	f_gas,500	σ_f,500	f_gas,200	σ_f,200

18 obj	10.1 ± 0.5	1.5 ± 0.4	12.7 ± 0.7		14.9 ± 1.0		16.6 ± 1.2
6 CC obj	8.7 ± 0.5	0.9 ± 0.4	10.7 ± 0.5	0.6 ± 0.6	12.3 ± 0.6	<1.9
12 NCC obj	10.9 ± 0.5	1.2 ± 0.6	13.8 ± 2.8		16.3 ± 1.4		17.8 ± 1.6

18 obj, T-scaled	9.9 ± 0.3	0.9 ± 0.4	12.6 ± 0.5	1.3 ± 0.5	14.6 ± 0.7		16.4 ± 1.1
6 CC obj, T-scaled	9.0 ± 0.4	<0.8	11.3 ± 0.5	<1.0	12.9 ± 0.6	<1.3
12 NCC obj, T-scaled	10.9 ± 0.5		13.4 ± 0.7		15.6 ± 1.0

Notes. The datasets labeled “T-scaled” were rescaled by the quantity (T_vir/7 keV)^β (see Eq. (3) and Table 2). Uncertainties are given at the 1σ confidence level, while upper limits are 90%.

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