IC 4253
Observation
| Spectrum ID | 99230141_sp1 |
|---|---|
| Alt name | g1327324-275220 |
| z | 0.0331 |
| RA, Dec | 201.8849, -27.8721 |
| MJD | 59351.59 |
| SNR/Å B/R | 10.7/24.0 |
| Obs Airmass | 1.14 |
| SMSS ID | 99230141 |
| Closest SMSS | 4.79'', 2161819968 |
| SMSS Mean r6"ap | 15.8 ± 0.1 |
| 2MASS Kext | 10.4 ± 0.1 |
AGN Properties
| Spectrum Type | Sy 1.2 |
|---|---|
| Quality Flag | good |
| AGN reference | 6dFGS |
| MW E(B−V) | 0.047 |
| Power law αν | 0.48 ± 0.01 |
| log L5100,AGN | 43.01 ± 0.01 |
| log HβBr/[O III] | 0.55 ± 0.06 |
| log ML5100/M☉ | 7.89 ± 0.07 |
| log MHα/M☉ | 7.35 ± 0.03 |
| log MHβ/M☉ | 7.76 ± 0.08 |
| log M[O III]/M☉ | 7.61 ± 0.09 |
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 | — | — | — | — |
| Hγ Broad | 40.46 ± 0.13 | 2622 ± 404 | 1066 ± 55 | 9.15 ± 1.50 |
| [O III] 4364 | — | — | — | — |
| He II Narrow | — | — | — | — |
| He II Broad | 40.58 ± 0.10 | 5921 ± 63 | 2515 ± 25 | 15.08 ± 1.95 |
| Hβ Narrow | — | — | — | — |
| Hβ Broad | 40.92 ± 0.05 | 5063 ± 412 | 2005 ± 32 | 36.31 ± 1.98 |
| [O III] 5007 | 40.38 ± 0.04 | 321 ± 63 | 190 ± 50 | 11.02 ± 0.84 |
| He I Narrow | 39.27 ± 0.28 | 311 ± 63 | 132 ± 25 | 1.29 ± 0.50 |
| He I Broad | 41.28 ± 0.03 | 17661 ± 62 | 7500 ± 25 | 133.35 ± 4.68 |
| [O I] 6300 | 39.28 ± 0.26 | 311 ± 63 | 132 ± 25 | 1.60 ± 0.58 |
| Hα Narrow | 40.04 ± 0.06 | 311 ± 63 | 132 ± 25 | 10.20 ± 0.68 |
| Hα Broad | 41.57 ± 0.01 | 3555 ± 98 | 1475 ± 25 | 345.50 ± 2.71 |
| [N II] 6585 | 40.31 ± 0.03 | 311 ± 63 | 132 ± 25 | 19.11 ± 0.69 |
| [S II] 6718 | 39.72 ± 0.10 | 311 ± 63 | 132 ± 25 | 5.19 ± 0.74 |
| [S II] 6732 | 39.73 ± 0.10 | 311 ± 63 | 132 ± 25 | 5.29 ± 0.74 |
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 | 8.26 |
|---|---|
| Hβ Broad SNR | 1.87 |
| Hγ Broad SNR | 1.38 |
| AGN frac | 0.39 |
| Host frac | 0.61 |
| log L5100,Host | 43.21 |
| Fe II/Hβ | — |
| Fe II/[O III] | — |
Quality flags
spurious_hab/hbb | 0.0/0 |
|---|---|
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.