Dust-to-metal ratios in damped Lyman-α absorbers - Fresh clues to the origins of dust and optical extinction towards γ-ray bursts

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Volume 560 (December 2013)

A&A, 560 (2013) A88

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Table 2

Spearman’s rank correlation coefficients ρ and significance.

x^a	y^a	Fig.	DLA	ρ^b	P^c	σ

(S01)		2	GRB	0.94	< 0.001	6.15

[Zn/H]_TOT		3	QSO	0.660	< 0.001	3.8
[Zn/H]_TOT		3	GRB	0.667	0.050	1.96

log N(Zn ii)_TOT		3	QSO	0.464	0.013	2.48
log N(Zn ii)_TOT		3	GRB	0.632	0.020	2.32

[X/H]_TOT^d		4	QSO	0.564	< 0.001	4.9
[X/H]_TOT^d		4	GRB	0.604	0.022	2.29

log N(Zn ii)_TOT,Eq^e		4	QSO	0.265	0.062	1.86
log N(Zn ii)_TOT,Eq^e		4	GRB	0.682	< 0.001	3.31

z		5	QSO	−0.052	0.671	0.43
z		5	GRB	−0.338	0.144	1.46

N(Fe)_dust_,Zn,Si	A _V	6	GRB	0.702	0.011	2.54
N(Fe)_dust_,Zn				0.357	0.385	0.88
N(Fe)_dust_,Si				0.305	0.392	0.86
N(Fe)_dust_,Zn^f				0.357	0.431	0.79
N(Fe)_dust_,Si^f				0.798	0.010	2.58

N(H i)		C.3	QSO	−0.123	0.318	1.00
N(H i)		C.3	GRB	−0.513	0.021	2.31

Notes.

^(a)

x- and y-axis sample populations for the correlation test.

^(b)

−1 ≤ ρ ≤ + 1, where ρ = + 1(−1) for perfect monotonic increasing (decreasing) correlations.

^(c)

Null-hypothesis probability, where the number of σ indicates the level of significance of the correlation.

^(d)

X is either Zn or Si.

^(e)

Zn or equivalent Zn column density derived from Si, see Fig. 4.

^(f)

Excluding the outlier GRB 070802.

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