LEDA 146662

Observation

Spectrum ID	18318735_sp1
Alt name	g0454429-431423
z	0.0869
RA, Dec	73.6787, -43.2396
MJD	60949.74
SNR/Å B/R	9.7/22.5
Obs Airmass	1.03
SMSS ID	18318735
Closest SMSS	None (< 15")
SMSS Mean r_6"ap	17.0 ± 0.1
2MASS K_ext	12.1 ± 0.1

AGN Properties

Spectrum Type	Sy 1.5+
Quality Flag	good
AGN reference	6dFGS
MW E(B−V)	0.011
Power law α_ν	0.49 ± 0.01
log L_5100,AGN	42.67 ± 0.15
log Hβ_Br/[O III]	<-0.06
log M_L5100/M_☉	—
log M_Hα/M_☉	7.77 ± 0.08
log M_Hβ/M_☉	—
log M_{[O III]}/M_☉	—

Spatial extraction & sky subtraction region

Spaxel scale: 1 arcsec² — Flux units: erg s⁻¹ cm⁻² Å⁻¹
Apertures: object (solid), background (dashed)

Spectrum decomposition

Emission line measurements

Line	log L (erg s⁻¹)	FWHM (km s⁻¹)	σ (km s⁻¹)	EW (Å)
Hγ Narrow	—	—	—	—
Hγ Broad	—	—	—	—
[O III] 4364	—	—	—	—
He II Narrow	—	—	—	—
He II Broad	40.23 ± 0.23	2728 ± 62	1159 ± 25	14.98 ± 5.34
Hβ Narrow	—	—	—	—
Hβ Broad	<40.73	—	—	—
[O III] 5007	40.79 ± 0.02	501 ± 62	213 ± 25	64.16 ± 2.83
He I Narrow	—	—	—	—
He I Broad	—	—	—	—
[O I] 6300	—	—	—	—
Hα Narrow	40.44 ± 0.06	499 ± 62	212 ± 25	56.20 ± 3.46
Hα Broad	41.58 ± 0.02	5721 ± 504	2397 ± 29	793.63 ± 14.99
[N II] 6585	40.69 ± 0.03	499 ± 62	212 ± 25	101.30 ± 3.67
[S II] 6718	40.48 ± 0.04	499 ± 62	212 ± 25	66.22 ± 5.40
[S II] 6732	40.34 ± 0.06	499 ± 62	212 ± 25	47.69 ± 4.73

All narrow line widths are tied to narrow [O III] 5007Å. [O III] 5007Å and narrow Hβ include a second narrow component not tied to other narrow lines.

Emission summary

Hα Broad SNR	3.24
Hβ Broad SNR	0.48
Hγ Broad SNR	0.00
AGN frac	0.11
Host frac	0.88
log L_5100,Host	43.55
Fe II/Hβ	—
Fe II/[O III]	0.37

Quality flags

`spurious_hab/hbb`	0.0/0
`l5100`	2
`balmer`	2
`balmer_snr`	2
`hb_width`	2
`balmer_width`	2

Hα mass estimates from Cho+2023. Remaining mass estimates from R–L relations in Wang & Woo 2024 and zero-points from Amrutha+2026.