LEDA 140831
Observation
| Spectrum ID | 484547673_sp2 |
|---|---|
| Alt name | PGC 140831 |
| z | 0.0419 |
| RA, Dec | 284.2823, -78.4726 |
| MJD | 61146.76 |
| SNR/Å B/R | 13.3/24.1 |
| Obs Airmass | 1.49 |
| SMSS ID | 484547673 |
| Closest SMSS | 12.65'', 2690879435 |
| SMSS Mean r6"ap | 15.4 ± 0.0 |
| 2MASS Kext | 10.9 ± 0.1 |
AGN Properties
| Spectrum Type | Sy 1.8 |
|---|---|
| Quality Flag | good |
| AGN reference | PGC |
| MW E(B−V) | 0.135 |
| Power law αν | -1.85 ± 0.18 |
| log L5100,AGN | 43.05 ± 0.05 |
| log HβBr/[O III] | -0.55 ± 0.30 |
| log ML5100/M☉ | 7.68 ± 0.03 |
| log MHα/M☉ | 7.67 ± 0.02 |
| log MHβ/M☉ | 7.53 ± 0.15 |
| log M[O III]/M☉ | 7.93 ± 0.01 |
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 | 39.77 ± 0.29 | 438 ± 63 | 256 ± 26 | 2.64 ± 1.18 |
| Hγ Broad | — | — | — | — |
| [O III] 4364 | 39.87 ± 0.17 | 398 ± 63 | 167 ± 25 | 3.31 ± 0.81 |
| He II Narrow | 39.80 ± 0.18 | 398 ± 63 | 167 ± 25 | 2.86 ± 0.69 |
| He II Broad | — | — | — | — |
| Hβ Narrow | 40.49 ± 0.04 | 438 ± 63 | 256 ± 26 | 14.06 ± 0.99 |
| Hβ Broad | 40.92 +0.55−0.05 | 3929 ± 28 | 1395 ± 25 | 37.68 ± 2.14 |
| [O III] 5007 | 41.47 ± 0.01 | 438 ± 63 | 256 ± 26 | 134.52 ± 1.08 |
| He I Narrow | 39.22 ± 0.43 | 398 ± 63 | 167 ± 25 | 0.78 ± 0.46 |
| He I Broad | 39.94 ± 0.19 | 1179 ± 62 | 500 ± 25 | 4.10 ± 0.82 |
| [O I] 6300 | 39.72 ± 0.14 | 398 ± 63 | 167 ± 25 | 2.47 ± 0.49 |
| Hα Narrow | 40.92 ± 0.02 | 398 ± 63 | 167 ± 25 | 39.52 ± 0.68 |
| Hα Broad | 42.06 ± 0.01 | 3670 ± 99 | 1798 ± 25 | 550.95 ± 2.10 |
| [N II] 6585 | 40.76 ± 0.02 | 398 ± 63 | 167 ± 25 | 27.29 ± 0.67 |
| [S II] 6718 | 40.47 ± 0.03 | 398 ± 63 | 167 ± 25 | 14.07 ± 0.52 |
| [S II] 6732 | 40.36 ± 0.03 | 398 ± 63 | 167 ± 25 | 10.99 ± 0.51 |
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 | 18.34 |
|---|---|
| Hβ Broad SNR | 1.88 |
| Hγ Broad SNR | 0.79 |
| AGN frac | 0.29 |
| Host frac | 0.71 |
| log L5100,Host | 43.43 |
| Fe II/Hβ | — |
| Fe II/[O III] | — |
Quality flags
spurious_hab/hbb | 0.0/1 |
|---|---|
l5100 | 1 |
balmer | 1 |
balmer_snr | 2 |
hb_width | 0 |
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.