ESO 254-16
Observation
| Spectrum ID | 28241676_sp1 |
|---|---|
| Alt name | g0606428-434352 |
| z | 0.0401 |
| RA, Dec | 91.6785, -43.7311 |
| MJD | 60288.62 |
| SNR/Å B/R | 16.3/33.7 |
| Obs Airmass | 1.02 |
| SMSS ID | 28241676 |
| Closest SMSS | 11.83'', 28241675 |
| SMSS Mean r6"ap | 15.7 ± 0.0 |
| 2MASS Kext | 11.5 ± 0.1 |
AGN Properties
| Spectrum Type | Sy 1.8+ |
|---|---|
| Quality Flag | good |
| AGN reference | 6dFGS |
| MW E(B−V) | 0.068 |
| Power law αν | 0.40 ± 0.14 |
| log L5100,AGN | 42.11 ± 0.14 |
| log HβBr/[O III] | <-0.73 |
| log ML5100/M☉ | — |
| log MHα/M☉ | 7.56 ± 0.07 |
| log MHβ/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 | 39.75 ± 0.22 | 445 ± 63 | 224 ± 27 | 14.92 ± 5.26 |
| Hγ Broad | — | — | — | — |
| [O III] 4364 | 39.66 ± 0.21 | 438 ± 62 | 185 ± 25 | 12.22 ± 3.69 |
| He II Narrow | 39.43 ± 0.31 | 438 ± 62 | 185 ± 25 | 8.59 ± 3.68 |
| He II Broad | — | — | — | — |
| Hβ Narrow | 40.34 ± 0.04 | 445 ± 63 | 224 ± 27 | 75.75 ± 5.11 |
| Hβ Broad | <40.66 | — | — | — |
| [O III] 5007 | 41.38 ± 0.01 | 445 ± 63 | 224 ± 27 | 895.76 ± 6.33 |
| He I Narrow | 39.11 ± 0.34 | 438 ± 62 | 185 ± 25 | 6.99 ± 3.41 |
| He I Broad | — | — | — | — |
| [O I] 6300 | 39.79 ± 0.08 | 438 ± 62 | 185 ± 25 | 39.79 ± 4.31 |
| Hα Narrow | 40.80 ± 0.01 | 438 ± 62 | 185 ± 25 | 451.31 ± 5.71 |
| Hα Broad | 41.33 ± 0.01 | 5376 ± 396 | 2354 ± 32 | 1525.44 ± 19.49 |
| [N II] 6585 | 40.94 ± 0.01 | 438 ± 62 | 185 ± 25 | 629.14 ± 6.05 |
| [S II] 6718 | 40.28 ± 0.03 | 438 ± 62 | 185 ± 25 | 143.39 ± 5.19 |
| [S II] 6732 | 40.29 ± 0.03 | 438 ± 62 | 185 ± 25 | 148.82 ± 5.09 |
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 | 3.68 |
|---|---|
| Hβ Broad SNR | 0.17 |
| Hγ Broad SNR | 0.00 |
| AGN frac | 0.04 |
| Host frac | 0.96 |
| log L5100,Host | 43.50 |
| 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.