ESO 287-42

Observation

Spectrum ID	488457185_sp1
Alt name	ESO287-G42
z	0.0186
RA, Dec	324.5329, -42.6050
MJD	60911.55
SNR/Å B/R	28.1/51.9
Obs Airmass	1.02
SMSS ID	488457185
Closest SMSS	None (< 15")
SMSS Mean r_6"ap	nan ± nan
2MASS K_ext	11.1 ± 0.0

AGN Properties

Spectrum Type	Sy 1.5+
Quality Flag	good
AGN reference	S7
MW E(B−V)	0.018
Power law α_ν	-1.98 ± 0.02
log L_5100,AGN	41.61 ± 0.22
log Hβ_Br/[O III]	<-0.09
log M_L5100/M_☉	—
log M_Hα/M_☉	6.73 ± 0.09
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	38.58 ± 0.39	406 ± 64	393 ± 46	4.71 ± 4.28
Hγ Broad	—	—	—	—
[O III] 4364	—	—	—	—
He II Narrow	—	—	—	—
He II Broad	—	—	—	—
Hβ Narrow	39.42 ± 0.07	406 ± 64	394 ± 45	32.35 ± 3.72
Hβ Broad	<39.59	—	—	—
[O III] 5007	39.68 ± 0.04	406 ± 64	394 ± 45	59.87 ± 3.49
He I Narrow	—	—	—	—
He I Broad	—	—	—	—
[O I] 6300	39.05 ± 0.06	364 ± 62	154 ± 25	14.22 ± 1.25
Hα Narrow	39.80 ± 0.02	364 ± 62	154 ± 25	79.84 ± 1.34
Hα Broad	40.17 ± 0.03	4691 ± 250	1891 ± 47	183.43 ± 5.12
[N II] 6585	39.54 ± 0.02	364 ± 62	154 ± 25	43.28 ± 1.29
[S II] 6718	39.58 ± 0.02	364 ± 62	154 ± 25	48.30 ± 1.37
[S II] 6732	39.50 ± 0.02	364 ± 62	154 ± 25	39.76 ± 1.45

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	1.95
Hβ Broad SNR	0.51
Hγ Broad SNR	0.00
AGN frac	0.05
Host frac	0.95
log L_5100,Host	42.91
Fe II/Hβ	—
Fe II/[O III]	—

Quality flags

`spurious_hab/hbb`	0.0/2
`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.