LEDA 840430
Observation
| Spectrum ID | 298010857_sp1 |
|---|---|
| Alt name | g2038102-203149 |
| z | 0.0359 |
| RA, Dec | 309.5423, -20.5303 |
| MJD | 59732.74 |
| SNR/Å B/R | 14.9/32.1 |
| Obs Airmass | 1.02 |
| SMSS ID | 298010857 |
| Closest SMSS | 11.53'', 298010856 |
| SMSS Mean r6"ap | 16.2 ± 0.1 |
| 2MASS Kext | 12.2 ± 0.1 |
AGN Properties
| Spectrum Type | Sy 1.8 |
|---|---|
| Quality Flag | good |
| AGN reference | 6dFGS |
| MW E(B−V) | 0.038 |
| Power law αν | -1.99 ± 0.01 |
| log L5100,AGN | 42.45 ± 0.05 |
| log HβBr/[O III] | -0.58 ± 0.07 |
| log ML5100/M☉ | 6.76 ± 0.05 |
| log MHα/M☉ | 6.86 ± 0.05 |
| log MHβ/M☉ | 6.52 ± 0.08 |
| log M[O III]/M☉ | 6.90 ± 0.05 |
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 | 39.32 ± 0.24 | 263 ± 63 | 134 ± 31 | 3.69 ± 1.82 |
| Hγ Broad | 40.15 ± 0.10 | 2249 ± 126 | 844 ± 43 | 23.76 ± 3.08 |
| [O III] 4364 | 39.10 ± 0.29 | 259 ± 62 | 109 ± 25 | 2.25 ± 0.96 |
| He II Narrow | — | — | — | — |
| He II Broad | — | — | — | — |
| Hβ Narrow | 39.77 ± 0.07 | 263 ± 63 | 134 ± 31 | 10.60 ± 1.40 |
| Hβ Broad | 40.14 ± 0.07 | 1831 ± 61 | 617 ± 25 | 23.77 ± 2.07 |
| [O III] 5007 | 40.72 ± 0.01 | 263 ± 63 | 134 ± 31 | 93.43 ± 1.48 |
| He I Narrow | — | — | — | — |
| He I Broad | 39.67 ± 0.13 | 2286 ± 63 | 971 ± 25 | 8.45 ± 1.39 |
| [O I] 6300 | 39.66 ± 0.04 | 259 ± 62 | 109 ± 25 | 8.24 ± 0.46 |
| Hα Narrow | 40.46 ± 0.01 | 259 ± 62 | 109 ± 25 | 51.54 ± 0.50 |
| Hα Broad | 41.21 ± 0.01 | 2614 ± 99 | 1463 ± 25 | 289.02 ± 2.09 |
| [N II] 6585 | 40.35 ± 0.01 | 259 ± 62 | 109 ± 25 | 40.68 ± 0.50 |
| [S II] 6718 | 40.03 ± 0.02 | 259 ± 62 | 109 ± 25 | 19.25 ± 0.49 |
| [S II] 6732 | 39.94 ± 0.02 | 259 ± 62 | 109 ± 25 | 15.60 ± 0.47 |
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 | 9.39 |
|---|---|
| Hβ Broad SNR | 1.99 |
| Hγ Broad SNR | 1.81 |
| AGN frac | 0.17 |
| Host frac | 0.83 |
| log L5100,Host | 43.13 |
| Fe II/Hβ | 0.53 |
| Fe II/[O III] | 0.13 |
Quality flags
spurious_hab/hbb | 0.0/0 |
|---|---|
l5100 | 2 |
balmer | 1 |
balmer_snr | 2 |
hb_width | 0 |
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.