6dFGS gJ155033.8-254349
Observation
| Spectrum ID | 120649442_sp1 |
|---|---|
| Alt name | g1550338-254349 |
| z | 0.0458 |
| RA, Dec | 237.6410, -25.7304 |
| MJD | 59725.54 |
| SNR/Å B/R | 19.3/33.2 |
| Obs Airmass | 1.02 |
| SMSS ID | 120649442 |
| Closest SMSS | None (< 15") |
| SMSS Mean r6"ap | 16.7 ± 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) | 0.273 |
| Power law αν | 0.47 ± 0.02 |
| log L5100,AGN | 43.21 ± 0.01 |
| log HβBr/[O III] | -0.07 ± 0.42 |
| log ML5100/M☉ | 7.76 ± 0.02 |
| log MHα/M☉ | 7.26 ± 0.03 |
| log MHβ/M☉ | 7.45 ± 0.20 |
| log M[O III]/M☉ | 7.61 ± 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 | 40.23 ± 0.09 | 327 ± 63 | 235 ± 30 | 3.65 ± 0.49 |
| Hγ Broad | — | — | — | — |
| [O III] 4364 | 39.85 ± 0.13 | 304 ± 63 | 128 ± 25 | 1.55 ± 0.33 |
| He II Narrow | — | — | — | — |
| He II Broad | — | — | — | — |
| Hβ Narrow | 40.64 ± 0.03 | 327 ± 63 | 235 ± 30 | 12.24 ± 0.53 |
| Hβ Broad | 40.73 +0.75−0.08 | 3954 ± 58 | 1466 ± 29 | 14.97 ± 1.28 |
| [O III] 5007 | 40.80 ± 0.02 | 327 ± 63 | 235 ± 30 | 19.06 ± 0.57 |
| He I Narrow | 39.52 ± 0.17 | 304 ± 63 | 128 ± 25 | 1.49 ± 0.33 |
| He I Broad | 40.55 ± 0.06 | 3498 ± 89 | 1485 ± 37 | 16.18 ± 1.13 |
| [O I] 6300 | 39.68 ± 0.10 | 304 ± 63 | 128 ± 25 | 2.57 ± 0.37 |
| Hα Narrow | 41.09 ± 0.01 | 304 ± 63 | 128 ± 25 | 72.71 ± 0.62 |
| Hα Broad | 41.60 ± 0.01 | 3149 ± 73 | 1365 ± 49 | 235.28 ± 2.39 |
| [N II] 6585 | 40.85 ± 0.01 | 304 ± 63 | 128 ± 25 | 42.39 ± 0.56 |
| [S II] 6718 | 40.46 ± 0.02 | 304 ± 63 | 128 ± 25 | 17.89 ± 0.48 |
| [S II] 6732 | 40.34 ± 0.02 | 304 ± 63 | 128 ± 25 | 13.67 ± 0.48 |
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 | 8.51 |
|---|---|
| Hβ Broad SNR | 1.35 |
| Hγ Broad SNR | 0.81 |
| AGN frac | 0.32 |
| Host frac | 0.68 |
| log L5100,Host | 43.53 |
| Fe II/Hβ | — |
| Fe II/[O III] | — |
Quality flags
spurious_hab/hbb | 0.0/1 |
|---|---|
l5100 | 2 |
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.