IRAS 18270-4705
Observation
| Spectrum ID | 474434945_sp1 |
|---|---|
| Alt name | 6708181330821888384 |
| z | 0.0837 |
| RA, Dec | 277.6944, -47.0513 |
| MJD | 60412.78 |
| SNR/Å B/R | 1.6/1.6 |
| Obs Airmass | 1.04 |
| SMSS ID | 474434945 |
| Closest SMSS | 7.45'', 474434944 |
| SMSS Mean r6"ap | 16.5 ± 0.0 |
| 2MASS Kext | 13.8 ± 0.2 |
AGN Properties
| Spectrum Type | Sy 2 |
|---|---|
| Quality Flag | good |
| AGN reference | AllBRICQS2 |
| MW E(B−V) | 0.049 |
| Power law αν | -0.33 ± 0.38 |
| log L5100,AGN | 43.86 ± 0.06 |
| log HβBr/[O III] | — |
| log ML5100/M☉ | — |
| log MHα/M☉ | — |
| 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 | 41.36 ± 0.19 | 348 ± 77 | 146 ± 32 | 12.47 ± 1.96 |
| Hγ Broad | — | — | — | — |
| [O III] 4364 | 40.93 ± 0.28 | 286 ± 89 | 121 ± 38 | 5.91 ± 1.80 |
| He II Narrow | 40.71 ± 0.35 | 286 ± 89 | 121 ± 38 | 3.96 ± 1.50 |
| He II Broad | 41.20 ± 0.29 | 1233 ± 81 | 523 ± 33 | 9.48 ± 3.22 |
| Hβ Narrow | 41.85 ± 0.12 | 348 ± 77 | 146 ± 32 | 48.06 ± 2.15 |
| Hβ Broad | — | — | — | — |
| [O III] 5007 | 42.41 ± 0.06 | 348 ± 77 | 146 ± 32 | 181.47 ± 3.05 |
| He I Narrow | 40.89 ± 0.29 | 286 ± 89 | 121 ± 38 | 8.19 ± 2.24 |
| He I Broad | 41.24 ± 0.23 | 1257 ± 98 | 534 ± 41 | 14.94 ± 3.96 |
| [O I] 6300 | 41.05 ± 0.16 | 286 ± 89 | 121 ± 38 | 13.61 ± 2.31 |
| Hα Narrow | 42.74 ± 0.05 | 286 ± 89 | 121 ± 38 | 325.96 ± 4.25 |
| Hα Broad | — | — | — | — |
| [N II] 6585 | 42.09 ± 0.08 | 286 ± 89 | 121 ± 38 | 76.07 ± 2.88 |
| [S II] 6718 | 41.52 ± 0.16 | 286 ± 89 | 121 ± 38 | 40.03 ± 3.37 |
| [S II] 6732 | 41.44 ± 0.13 | 286 ± 89 | 121 ± 38 | 34.97 ± 3.02 |
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 | 0.00 |
|---|---|
| Hβ Broad SNR | 0.00 |
| Hγ Broad SNR | 0.00 |
| AGN frac | 0.84 |
| Host frac | 0.15 |
| log L5100,Host | 43.12 |
| Fe II/Hβ | — |
| Fe II/[O III] | 0.20 |
Quality flags
spurious_hab/hbb | 1.0/0 |
|---|---|
l5100 | 0 |
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.