JWST MIRI reveals the diversity of nuclear mid-infrared spectra of nearby type 2 quasars

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Table 4.

Density values derived from the [NeV]_14.3/24.3 ratio, the optical trans-auroral lines, and the [SII]λλ6716,6731 Å doublet.

QSO2	[NeV]_14.3/24.3	log n $_{e}^{[NeV]}$ ${}_e^{\mathrm {[NeV]}}$		log n $_{e}^{[TR]}$ ${}_e^{\mathrm {[TR]}}$	log n $_{e}^{[SII]}$ ${}_e^{\mathrm {[SII]}}$

		T_e = 10⁴ K	T_e = 2×10⁴ K
		(cm⁻³)	(cm⁻³)	(cm⁻³)	(cm⁻³)
J1010	>2.89 ^(*)	>4.07	>4.33	4.58±0.03	2.95 $\pm_{0.05}^{0.04}$ $\pm ^{0.04}_{0.05}$
J1100	2.32±0.05	3.88±0.02	4.14±0.02	3.99 $\pm_{0.08}^{0.07}$ $\pm ^{0.07}_{0.08}$	2.92±0.05
J1356	1.00±0.30	2.8 $\pm_{\dots}^{0.5}$ $\pm ^{0.5}_{\dots }$	3.1 $\pm_{\dots}^{0.5}$ $\pm ^{0.5}_{\dots }$	3.21±0.15	2.49 $\pm_{0.12}^{0.09}$ $\pm ^{0.09}_{0.12}$
J1430	1.40±0.34	3.4 $\pm_{0.5}^{0.2}$ $\pm ^{0.2}_{0.5}$	3.7 $\pm_{0.5}^{0.2}$ $\pm ^{0.2}_{0.5}$	3.24 $\pm_{0.30}^{0.05}$ $\pm ^{0.05}_{0.30}$	2.97 $\pm_{0.06}^{0.05}$ $\pm ^{0.05}_{0.06}$
J1509	1.73±0.13	3.64 $\pm_{0.09}^{0.05}$ $\pm ^{0.05}_{0.09}$	3.90 $\pm_{0.09}^{0.05}$ $\pm ^{0.05}_{0.09}$	3.41 $\pm_{0.21}^{0.11}$ $\pm ^{0.11}_{0.21}$	2.80 $\pm_{0.27}^{0.18}$ $\pm ^{0.18}_{0.27}$

Notes. [NeV]_14.3/24.3 measured from the nuclear mid-infrared spectra and corresponding n_e values derived with PyNeb (v 1.1.19; Luridiana et al. 2015) for T_e = 10⁴ and 2×10⁴ K. The values measured for J1356 do not have a lower limit on the errors because [NeV]_14.3/24.3 = 0.70 does not permit n_e to be constrained at those temperatures (see Fig. 6). The last two columns are the n_e values derived from the optical trans-auroral ratios (involving [SII]λλ4068,4076 Å, [SII]λλ6716,6731 Å, [OII]λλ3726,3729 Å, and [OII]λλ7319,7331 Å) reported by Speranza et al. (2024) and Bessiere et al. (2024), and from the [SII]λλ6716,6731 Å doublet.

^(*)

Value of the [NeV] ratio derived from the upper limit at 2σ measured for [NeV]_24.3.

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