The VIMOS Public Extragalactic Redshift Survey (VIPERS) - Full spectroscopic data and auxiliary information release (PDR-2)

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Volume 609 (January 2018)

A&A, 609 (2018) A84

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Table 1

Statistics of double redshift measurements, both internal to the VIPERS sample and against external data.

Sample	N _gal	N _agree	Matching	σ₂(Δz/ (1 + z))		σ_v = cσ_z	Mean Δv
			(%)			(km s^-1)	(km s^-1)

Internal Comparison

All measurements	3114	2626	84.3%	0.00079	0.00056	166	–
Both flags ≥ 2	2466	2275	92.3%	0.00077	0.00054	163	–
Both flags 3,4	1249	1238	99.1%	0.00075	0.00053	159	–
Both flags ≥ 2; faint	–	1099	–	0.00077	0.00055	164	–
Both flags ≥ 2; bright	–	336	–	0.00071	0.00050	150	–
Both flags ≥ 2; weak EL	–	1153	–	0.00079	0.00056	167	–
Both flags ≥ 2; strong EL	–	508	–	0.00066	0.00046	139	–

External Comparison with VVDS

All measurements	737	629	85.3%	0.00093	0.00066	198	26
Both flags 3, 4	358	350	97.8%	0.00083	0.00059	177	40

External Comparison with BOSS

All measurements	747	736	98.5%	0.00064	0.00045*	136*	−108
VIPERS flags 3, 4	690	684	99.1%	0.00061	0.00043*	130*	−113

Notes. This is probably an underestimate of the uncertainty on the VIPERS side, because the assumption of uncertainty equipartition does not fully apply in the BOSS comparison.

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