The mass-metallicity relation of SDSS quasars | Astronomy & Astrophysics (A&A)

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Table 4

Results of the Spearman rank-order test.

Line ratio	r_s^a	p(r_s)^b

vs. black hole mass
N v/C iv	+ 0.94	5.03 × 10^-15
N v/He ii	+ 0.94	9.08 × 10^-15
(Si iv+O iv])/C iv	+ 0.99	2.20 × 10^-16
Al iii/C iv	+ 0.87	3.44 × 10^-10

vs. Eddington ratio
N v/C iv	+ 0.86	5.09 × 10^-10
N v/He ii	+ 0.97	2.20 × 10^-16
(Si iv+O iv])/C iv	− 0.28	1.24 × 10^-1
Al iii/C iv	+ 0.38	3.60 × 10^-2

^(a)

Spearman rank-order correlation coefficient.

^(b)

Probability of the data being consistent with the null hypothesis that the flux ratio is not correlated with the black hole mass or the Eddington ratio.

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