ESO 31-8
Observation
| Spectrum ID | 491729490_sp1 |
|---|---|
| Alt name | g0307353-725003 |
| z | 0.0276 |
| RA, Dec | 46.8972, -72.8341 |
| MJD | 60164.78 |
| SNR/Å B/R | 19.7/34.2 |
| Obs Airmass | 1.36 |
| SMSS ID | 491729490 |
| Closest SMSS | None (< 15") |
| SMSS Mean r6"ap | 15.1 ± 0.1 |
| 2MASS Kext | 11.4 ± 0.1 |
AGN Properties
| Spectrum Type | Sy 1.0 |
|---|---|
| Quality Flag | good |
| AGN reference | 6dFGS |
| MW E(B−V) | 0.038 |
| Power law αν | -1.21 ± 0.04 |
| log L5100,AGN | 43.00 ± 0.01 |
| log HβBr/[O III] | 0.79 ± 0.02 |
| log ML5100/M☉ | 7.47 ± 0.03 |
| log MHα/M☉ | 6.95 ± 0.03 |
| log MHβ/M☉ | 7.45 ± 0.04 |
| log M[O III]/M☉ | 7.20 ± 0.06 |
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 | 39.17 ± 0.26 | 244 ± 63 | 132 ± 26 | 0.65 ± 0.22 |
| Hγ Broad | 40.27 ± 0.06 | 2068 ± 295 | 814 ± 73 | 8.21 ± 0.65 |
| [O III] 4364 | — | — | — | — |
| He II Narrow | — | — | — | — |
| He II Broad | 39.66 ± 0.18 | 2175 ± 85 | 924 ± 35 | 2.16 ± 0.50 |
| Hβ Narrow | 39.72 ± 0.06 | 244 ± 63 | 132 ± 26 | 2.58 ± 0.20 |
| Hβ Broad | 41.16 ± 0.01 | 3157 ± 86 | 2845 ± 58 | 70.50 ± 1.21 |
| [O III] 5007 | 40.37 ± 0.01 | 244 ± 63 | 132 ± 26 | 11.75 ± 0.19 |
| He I Narrow | — | — | — | — |
| He I Broad | 39.56 ± 0.10 | 1286 ± 73 | 546 ± 29 | 2.02 ± 0.25 |
| [O I] 6300 | 38.29 ± 0.44 | 240 ± 63 | 101 ± 25 | 0.12 ± 0.11 |
| Hα Narrow | 39.99 ± 0.02 | 240 ± 63 | 101 ± 25 | 6.10 ± 0.16 |
| Hα Broad | 41.48 ± 0.01 | 2396 ± 64 | 1097 ± 25 | 188.57 ± 0.62 |
| [N II] 6585 | 39.70 ± 0.04 | 240 ± 63 | 101 ± 25 | 3.08 ± 0.15 |
| [S II] 6718 | 39.41 ± 0.06 | 240 ± 63 | 101 ± 25 | 1.62 ± 0.13 |
| [S II] 6732 | 39.27 ± 0.07 | 240 ± 63 | 101 ± 25 | 1.18 ± 0.14 |
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 | 26.72 |
|---|---|
| Hβ Broad SNR | 9.34 |
| Hγ Broad SNR | 3.15 |
| AGN frac | 0.64 |
| Host frac | 0.36 |
| log L5100,Host | 42.75 |
| Fe II/Hβ | 0.80 |
| Fe II/[O III] | 4.93 |
Quality flags
spurious_hab/hbb | 0.0/0 |
|---|---|
l5100 | 0 |
balmer | 0 |
balmer_snr | 0 |
hb_width | 2 |
balmer_width | 0 |
Hα mass estimates from Cho+2023. Remaining mass estimates from R–L relations in Wang & Woo 2024 and zero-points from Amrutha+2026.