ESO 12-21
Observation
| Spectrum ID | 491254099_sp1 |
|---|---|
| Alt name | ESO 12-21 |
| z | 0.0327 |
| RA, Dec | 10.1920, -79.2400 |
| MJD | 60905.8 |
| SNR/Å B/R | 20.8/37.4 |
| Obs Airmass | 1.55 |
| SMSS ID | 491254099 |
| Closest SMSS | None (< 15") |
| SMSS Mean r6"ap | 14.7 ± 0.1 |
| 2MASS Kext | 10.6 ± 0.0 |
AGN Properties
| Spectrum Type | Sy 1.5 |
|---|---|
| Quality Flag | good |
| AGN reference | PGC |
| MW E(B−V) | 0.069 |
| Power law αν | -1.64 ± 0.02 |
| log L5100,AGN | 43.52 ± 0.01 |
| log HβBr/[O III] | 0.28 ± 0.02 |
| log ML5100/M☉ | 7.03 ± 0.03 |
| log MHα/M☉ | 6.63 ± 0.04 |
| log MHβ/M☉ | 6.87 ± 0.04 |
| log M[O III]/M☉ | 6.88 ± 0.04 |
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 | 40.21 ± 0.11 | 373 ± 63 | 204 ± 25 | 2.37 ± 0.24 |
| Hγ Broad | 40.60 ± 0.07 | 1227 ± 74 | 438 ± 27 | 5.58 ± 0.41 |
| [O III] 4364 | — | — | — | — |
| He II Narrow | 39.72 ± 0.16 | 356 ± 63 | 150 ± 25 | 0.78 ± 0.17 |
| He II Broad | 40.44 ± 0.10 | 3439 ± 98 | 1461 ± 41 | 4.18 ± 0.52 |
| Hβ Narrow | 40.68 ± 0.03 | 373 ± 63 | 204 ± 25 | 7.24 ± 0.17 |
| Hβ Broad | 41.34 ± 0.01 | 1465 ± 49 | 819 ± 27 | 33.50 ± 0.52 |
| [O III] 5007 | 41.07 ± 0.01 | 373 ± 63 | 204 ± 25 | 17.95 ± 0.20 |
| He I Narrow | 39.73 ± 0.09 | 356 ± 63 | 150 ± 25 | 0.87 ± 0.10 |
| He I Broad | 40.68 ± 0.03 | 3175 ± 81 | 1348 ± 33 | 7.89 ± 0.33 |
| [O I] 6300 | 39.86 ± 0.06 | 356 ± 63 | 150 ± 25 | 1.21 ± 0.11 |
| Hα Narrow | 41.37 ± 0.01 | 356 ± 63 | 150 ± 25 | 39.66 ± 0.17 |
| Hα Broad | 41.85 ± 0.01 | 1287 ± 63 | 601 ± 25 | 120.27 ± 0.38 |
| [N II] 6585 | 41.01 ± 0.01 | 356 ± 63 | 150 ± 25 | 17.61 ± 0.14 |
| [S II] 6718 | 40.47 ± 0.02 | 356 ± 63 | 150 ± 25 | 5.04 ± 0.12 |
| [S II] 6732 | 40.31 ± 0.02 | 356 ± 63 | 150 ± 25 | 3.55 ± 0.12 |
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 | 42.42 |
|---|---|
| Hβ Broad SNR | 13.94 |
| Hγ Broad SNR | 4.34 |
| AGN frac | 0.76 |
| Host frac | 0.24 |
| log L5100,Host | 43.03 |
| Fe II/Hβ | 2.32 |
| Fe II/[O III] | 4.38 |
Quality flags
spurious_hab/hbb | 0.0/0 |
|---|---|
l5100 | 0 |
balmer | 0 |
balmer_snr | 0 |
hb_width | 1 |
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.