The XXL Survey - XXIII. The mass scale of XXL clusters from ensemble spectroscopy

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Volume 620 (December 2018)

A&A, 620 (2018) A8

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The XXL Survey: second series

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Table 3

Sensitivity analysis of σ_gal − kT_{300 kpc} inferred parameters.

Model	σ_p [km s ⁻¹]	α	β	p	# Clusters	# Galaxies
Fiducial	539 ± 16	0.63 ± 0.05	− 0.43 ± 0.38	0.88 ± 0.02	128	1592
Measured kT_{300 kpc} only	547 ± 17	0.60 ± 0.05	− 0.39 ± 0.39	0.87 ± 0.02	103	1421
r < 0.5r₅₀₀	509 ± 20	0.67 ± 0.07	− 1.29 ± 0.50	0.90 ± 0.02	127	891
r < 2.0r₅₀₀	557 ± 13	0.56 ± 0.04	0.42 ± 0.32	0.82 ± 0.02	131	2810
= 2000 km s⁻¹	526 ± 18	0.62 ± 0.05	− 0.50 ± 0.40	0.88 ± 0.02	128	1557
= 3000 km s⁻¹	549 ± 15	0.63 ± 0.05	− 0.45 ± 0.37	0.88 ± 0.02	128	1617
	539 ± 16	0.61 ± 0.05	− 0.46 ± 0.39	0.88 ± 0.02	128	1591
	543 ± 16	0.65 ± 0.05	− 0.48 ± 0.38	0.88 ± 0.02	128	1589
z_c > 0.25 ³	550 ± 32	0.58 ± 0.09	− 0.82 ± 0.79	0.87 ± 0.02	84	814
z_c ≤ 0.25 ³	576 ± 48	0.63 ± 0.06	0.63 ± 1.42	0.88 ± 0.02	44	778

Notes. See text for further discussion. ¹ Normalization of the maximum velocity threshold in Eq. (2). ²Slope in temperature of the maximum velocity threshold in Eq. (2). ³ Cluster redshift.

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