LEDA 178653
Observation
| Spectrum ID | 499996579_sp1 |
|---|---|
| Alt name | g0550536-621455 |
| z | 0.0587 |
| RA, Dec | 87.7234, -62.2486 |
| MJD | 60608.73 |
| SNR/Å B/R | 13.1/25.7 |
| Obs Airmass | 1.17 |
| SMSS ID | 499996579 |
| Closest SMSS | None (< 15") |
| SMSS Mean r6"ap | 16.0 ± 0.1 |
| 2MASS Kext | 12.5 ± 0.1 |
AGN Properties
| Spectrum Type | Sy 1.5 |
|---|---|
| Quality Flag | good |
| AGN reference | 6dFGS |
| MW E(B−V) | 0.040 |
| Power law αν | -0.49 ± 0.31 |
| log L5100,AGN | 43.01 ± 0.07 |
| log HβBr/[O III] | -0.40 ± 0.32 |
| log ML5100/M☉ | 7.11 ± 0.04 |
| log MHα/M☉ | 7.09 ± 0.03 |
| log MHβ/M☉ | 7.03 ± 0.16 |
| log M[O III]/M☉ | 7.36 ± 0.02 |
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 | 40.17 ± 0.25 | 598 ± 63 | 399 ± 27 | 5.84 ± 1.39 |
| Hγ Broad | 40.66 ± 0.10 | 1306 ± 126 | 516 ± 62 | 16.79 ± 1.57 |
| [O III] 4364 | 40.41 ± 0.07 | 545 ± 63 | 231 ± 25 | 10.15 ± 0.91 |
| He II Narrow | 39.45 ± 0.44 | 545 ± 63 | 231 ± 25 | 1.24 ± 0.83 |
| He II Broad | — | — | — | — |
| Hβ Narrow | 40.71 ± 0.05 | 598 ± 63 | 399 ± 27 | 23.75 ± 1.42 |
| Hβ Broad | 41.04 +0.60−0.04 | 2068 ± 33 | 746 ± 25 | 50.60 ± 1.76 |
| [O III] 5007 | 41.43 ± 0.01 | 598 ± 63 | 400 ± 27 | 131.91 ± 1.53 |
| He I Narrow | 39.27 ± 0.34 | 545 ± 63 | 231 ± 25 | 1.16 ± 0.62 |
| He I Broad | 40.62 ± 0.06 | 4377 ± 86 | 1859 ± 35 | 25.96 ± 1.92 |
| [O I] 6300 | 39.93 ± 0.08 | 545 ± 63 | 231 ± 25 | 5.82 ± 0.68 |
| Hα Narrow | 40.98 ± 0.02 | 545 ± 63 | 231 ± 25 | 69.33 ± 0.99 |
| Hα Broad | 41.84 ± 0.01 | 2178 ± 68 | 899 ± 25 | 510.43 ± 2.08 |
| [N II] 6585 | 40.97 ± 0.02 | 545 ± 63 | 231 ± 25 | 67.99 ± 0.95 |
| [S II] 6718 | 40.53 ± 0.02 | 545 ± 63 | 231 ± 25 | 25.41 ± 0.78 |
| [S II] 6732 | 40.46 ± 0.02 | 545 ± 63 | 231 ± 25 | 22.14 ± 0.77 |
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 | 20.31 |
|---|---|
| Hβ Broad SNR | 4.85 |
| Hγ Broad SNR | 3.48 |
| AGN frac | 0.28 |
| Host frac | 0.72 |
| log L5100,Host | 43.41 |
| Fe II/Hβ | — |
| Fe II/[O III] | — |
Quality flags
spurious_hab/hbb | 0.0/1 |
|---|---|
l5100 | 1 |
balmer | 0 |
balmer_snr | 0 |
hb_width | 0 |
balmer_width | 1 |
Hα mass estimates from Cho+2023. Remaining mass estimates from R–L relations in Wang & Woo 2024 and zero-points from Amrutha+2026.