The ensemble broad-frequency power spectrum of Stripe-82 quasars from multiple surveys

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Table 3.

Best-fit parameters when fitting the ensemble PSDs in various λ_Edd bins, for quasars with log(M_BH) in the range [8.7–8.9].

	AR1	AR2	AR3
log λ_Edd∈	[–1.3, –1.0)	[–1.0, –0.75)	[–0.75, –0.40]
num. sources	69	96	66
PSD_{norm, DRW}^a	14±3	16±4	10.3±2.5
PSD_{norm, BPL}^a	9±1	12.0±0.3	5.20±0.06
ν_{b, DRW}^b	1.2±0.2	1±0.1	0.9±0.1
ν_{b, BPL}^b	5±1	< 5	4.1±0.8
α_{, DRW}	–	–	–
α_{high, BPL}	–2.82.8±0.3	–2.2±0.2	–2.8±0.2
$χ^{2} / {d . o . f .}_{, D R W}$ $\chi^{2}/\mathrm{d.o.f.}_{,\ DRW}$	33.6/22	34.2/29	40.5/25
$χ^{2} / {d . o . f .}_{, B P L}$ $\chi^{2}/\mathrm{d.o.f.}_{,\ BPL}$	28.4/21	34.4/28	30.5/24
p_{null, DRW}	0.05	0.23	0.03
p_{null, BPL}	0.13	0.19	0.17

Notes.

In units of 10⁻³(1/day⁻¹),

In units of 10⁻³ day⁻¹.

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