GA-NIFS: High number of dual active galactic nuclei at z ∼ 3

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Volume 696 (April 2025)

A&A, 696 (2025) A59

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Table A.2.

NIRSpec fit results.

Target	σ	Log([O III] /Hβ)	Log([N II] /Hα)	Hα/Hβ	EW(Hα)	Log(L([O III]))	Log(L(Hα))
	(km s⁻¹)				(Å)	(erg s⁻¹)	(erg s⁻¹)
COS1638-A	$1200_{- 90}^{+ 45}$ $1200_{-90}^{+45}$	$0 . 08_{- 0.03}^{+ 0.08}$ $0.08_{-0.03}^{+0.08}$	$- 0 . 45_{- 0.55}^{+ 0.51}$ $-0.45_{-0.55}^{+0.51}$	$6 . 4_{- 0.5}^{+ 2.1}$ $6.4_{-0.5}^{+2.1}$	$40_{- 10}^{+ 30}$ $40_{-10}^{+30}$	42.6	42.9
COS1638-B	$1030_{- 36}^{+ 120}$ $1030_{-36}^{+120}$	$0 . 60_{- 0.10}^{+ 0.20}$ $0.60_{-0.10}^{+0.20}$	$0 . 40_{- 0.30}^{+ 0.20}$ $0.40_{-0.30}^{+0.20}$	$9 . 1_{- 2.5}^{+ 8.0}$ $9.1_{-2.5}^{+8.0}$	$100_{- 11}^{+ 50}$ $100_{-11}^{+50}$	41.5	41.3

COS1656-A	$666_{- 6}^{+ 10}$ $666_{-6}^{+10}$	$1 . 01_{- 0.02}^{+ 0.03}$ $1.01_{-0.02}^{+0.03}$	$0 . 15_{- 0.01}^{+ 0.02}$ $0.15_{-0.01}^{+0.02}$	$4 . 2_{- 0.2}^{+ 0.3}$ $4.2_{-0.2}^{+0.3}$	$63_{- 1}^{+ 2}$ $63_{-1}^{+2}$	42.3	41.9
COS1656-B	127 ± 7	$0 . 60_{- 0.03}^{+ 0.04}$ $0.60_{-0.03}^{+0.04}$	$- 0 . 32_{- 0.02}^{+ 0.03}$ $-0.32_{-0.02}^{+0.03}$	$2 . 9_{- 0.2}^{+ 0.4}$ $2.9_{-0.2}^{+0.4}$	$85_{- 3}^{+ 5}$ $85_{-3}^{+5}$	41.4	41.4
Clump	83 ± 4	0.89 ± 0.03	$- 0 . 95_{- 0.06}^{+ 0.09}$ $-0.95_{-0.06}^{+0.09}$	$3 . 5_{- 0.1}^{+ 0.3}$ $3.5_{-0.1}^{+0.3}$	$183_{- 6}^{+ 8}$ $183_{-6}^{+8}$	41.8	41.4

Eastfield	$180_{- 30}^{+ 10}$ $180_{-30}^{+10}$	$0 . 86_{- 0.04}^{+ 0.06}$ $0.86_{-0.04}^{+0.06}$	$- 0 . 35_{- 0.04}^{+ 0.09}$ $-0.35_{-0.04}^{+0.09}$	$2 . 5_{- 0.2}^{+ 0.4}$ $2.5_{-0.2}^{+0.4}$	$165_{- 9}^{+ 7}$ $165_{-9}^{+7}$	42.1	41.8
Mr. West	275 ± 40	$0 . 88_{- 0.11}^{0.08}$ $0.88_{-0.11}^{0.08}$	$0 . 06_{- 0.05}^{+ 0.10}$ $0.06_{-0.05}^{+0.10}$	$3 . 4_{- 0.7}^{+ 1.1}$ $3.4_{-0.7}^{+1.1}$	$62_{- 4}^{+ 8}$ $62_{-4}^{+8}$	41.8	41.5
Clump	85 ± 2	$0 . 93_{- 0.02}^{+ 0.05}$ $0.93_{-0.02}^{+0.05}$	$- 0 . 68_{- 0.08}^{+ 0.02}$ $-0.68_{-0.08}^{+0.02}$	$3 . 6_{- 0.2}^{+ 0.5}$ $3.6_{-0.2}^{+0.5}$	127 ± 3	41.8	41.4

GS551-A	$450_{- 5}^{+ 10}$ $450_{-5}^{+10}$	$1 . 06_{- 0.02}^{+ 0.04}$ $1.06_{-0.02}^{+0.04}$	$- 0 . 26_{- 0.04}^{+ 0.10}$ $-0.26_{-0.04}^{+0.10}$	$3 . 3_{- 0.1}^{+ 0.4}$ $3.3_{-0.1}^{+0.4}$	$150_{- 5}^{+ 4}$ $150_{-5}^{+4}$	43.1	42.5
GS551-B	$55_{- 2}^{+ 3}$ $55_{-2}^{+3}$	$1 . 10_{0.02}^{+ 0.03}$ $1.10_{0.02}^{+0.03}$	$- 0 . 56_{- 0.04}^{+ 0.06}$ $-0.56_{-0.04}^{+0.06}$	$3 . 2_{- 0.2}^{+ 0.3}$ $3.2_{-0.2}^{+0.3}$	> 38	41.9	41.3

GS10578-A	730 ± 10	$1 . 01_{- 0.02}^{+ 0.12}$ $1.01_{-0.02}^{+0.12}$	$0 . 88_{- 0.09}^{+ 0.07}$ $0.88_{-0.09}^{+0.07}$	$3 . 2_{- 0.5}^{+ 0.7}$ $3.2_{-0.5}^{+0.7}$	$165_{- 1}^{+ 1}$ $165_{-1}^{+1}$	42.2	41.5
GS10578-B	114 ± 5	$0 . 97_{0.05}^{+ 0.13}$ $0.97_{0.05}^{+0.13}$	$- 0 . 73_{- 0.02}^{+ 0.06}$ $-0.73_{-0.02}^{+0.06}$	$3 . 3_{- 0.3}^{+ 0.1}$ $3.3_{-0.3}^{+0.1}$	$72_{- 5}^{+ 4}$ $72_{-5}^{+4}$	41.5	41.1
Clump	$190_{- 7}^{+ 8}$ $190_{-7}^{+8}$	$0 . 97_{- 0.06}^{+ 0.09}$ $0.97_{-0.06}^{+0.09}$	< − 0.78	$4 . 2_{- 0.4}^{+ 1.3}$ $4.2_{-0.4}^{+1.3}$	$55_{- 2}^{+ 3}$ $55_{-2}^{+3}$	41.2	40.9

Notes. Best-fit spectroscopic results for the most prominent emission lines detected with NIRSpec. The velocity dispersion σ refers to the total [O III] emission line profile. [O III] and Hα luminosities have typical uncertainty of 0.1 dex, and are not corrected for extinction. COS1638-A flux ratios are affected by degeneracy between NLR (systemic and outflow) and BLR emission.

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