ESO 198-24
Observation
| Spectrum ID | 503604957_sp1 |
|---|---|
| Alt name | ESO 198-24 |
| z | 0.0452 |
| RA, Dec | 39.5822, -52.1923 |
| MJD | 59492.76 |
| SNR/Å B/R | 9.4/24.7 |
| Obs Airmass | 1.22 |
| SMSS ID | 503604957 |
| Closest SMSS | 14.64'', 503604956 |
| SMSS Mean r6"ap | 15.6 ± 0.2 |
| 2MASS Kext | 11.1 ± 0.0 |
AGN Properties
| Spectrum Type | Sy 1.8+ |
|---|---|
| Quality Flag | good |
| AGN reference | PGC |
| MW E(B−V) | 0.029 |
| Power law αν | 0.44 ± 0.07 |
| log L5100,AGN | 42.71 ± 0.04 |
| log HβBr/[O III] | <-0.61 |
| log ML5100/M☉ | — |
| log MHα/M☉ | 7.87 ± 0.04 |
| 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 | 39.74 ± 0.21 | 282 ± 63 | 239 ± 26 | 3.74 ± 1.24 |
| Hγ Broad | — | — | — | — |
| [O III] 4364 | 39.04 ± 0.44 | 244 ± 63 | 102 ± 25 | 0.75 ± 0.66 |
| He II Narrow | 39.30 ± 0.30 | 244 ± 63 | 102 ± 25 | 1.62 ± 0.71 |
| He II Broad | — | — | — | — |
| Hβ Narrow | 40.02 ± 0.10 | 282 ± 63 | 239 ± 26 | 9.43 ± 1.35 |
| Hβ Broad | <40.49 | — | — | — |
| [O III] 5007 | 41.10 ± 0.01 | 282 ± 63 | 239 ± 26 | 121.69 ± 1.51 |
| He I Narrow | 39.00 ± 0.33 | 244 ± 63 | 102 ± 25 | 1.41 ± 0.61 |
| He I Broad | 39.87 ± 0.18 | 3383 ± 63 | 1437 ± 25 | 10.52 ± 2.25 |
| [O I] 6300 | 39.97 ± 0.03 | 244 ± 63 | 102 ± 25 | 15.63 ± 0.73 |
| Hα Narrow | 40.43 ± 0.02 | 244 ± 63 | 102 ± 25 | 49.70 ± 1.03 |
| Hα Broad | 41.76 ± 0.01 | 5681 ± 283 | 3110 ± 25 | 1064.66 ± 5.69 |
| [N II] 6585 | 40.48 ± 0.01 | 244 ± 63 | 102 ± 25 | 56.56 ± 1.03 |
| [S II] 6718 | 40.05 ± 0.03 | 244 ± 63 | 102 ± 25 | 21.96 ± 0.90 |
| [S II] 6732 | 40.08 ± 0.03 | 244 ± 63 | 102 ± 25 | 23.77 ± 0.92 |
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 | 9.04 |
|---|---|
| Hβ Broad SNR | 0.37 |
| Hγ Broad SNR | 0.00 |
| AGN frac | 0.26 |
| Host frac | 0.74 |
| log L5100,Host | 43.16 |
| Fe II/Hβ | — |
| Fe II/[O III] | — |
Quality flags
spurious_hab/hbb | 0.0/1 |
|---|---|
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.