NGC 7450
Observation
| Spectrum ID | 7107556_sp1 |
|---|---|
| Alt name | g2300478-125507 |
| z | 0.0104 |
| RA, Dec | 345.1992, -12.9185 |
| MJD | 60176.61 |
| SNR/Å B/R | 15.7/30.5 |
| Obs Airmass | 1.06 |
| SMSS ID | 7107556 |
| Closest SMSS | 6.54'', 2012131178 |
| SMSS Mean r6"ap | 14.8 ± 0.0 |
| 2MASS Kext | 10.1 ± 0.0 |
AGN Properties
| Spectrum Type | Sy 1.5 |
|---|---|
| Quality Flag | good |
| AGN reference | 6dFGS |
| MW E(B−V) | 0.038 |
| Power law αν | -1.71 ± 0.20 |
| log L5100,AGN | 41.94 ± 0.05 |
| log HβBr/[O III] | -0.46 ± 0.02 |
| log ML5100/M☉ | 6.77 ± 0.06 |
| log MHα/M☉ | 6.37 ± 0.06 |
| log MHβ/M☉ | 6.62 ± 0.08 |
| log M[O III]/M☉ | 6.94 ± 0.06 |
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 | 38.67 ± 0.16 | 228 ± 62 | 110 ± 25 | 2.64 ± 0.50 |
| Hγ Broad | 39.34 ± 0.09 | 1630 ± 184 | 649 ± 50 | 11.47 ± 1.26 |
| [O III] 4364 | 38.62 ± 0.14 | 228 ± 62 | 95 ± 25 | 2.33 ± 0.43 |
| He II Narrow | 38.83 ± 0.07 | 228 ± 62 | 95 ± 25 | 3.88 ± 0.35 |
| He II Broad | 38.28 ± 0.45 | 1789 ± 63 | 760 ± 25 | 1.09 ± 0.91 |
| Hβ Narrow | 39.31 ± 0.03 | 228 ± 62 | 110 ± 25 | 11.89 ± 0.42 |
| Hβ Broad | 39.87 ± 0.02 | 2376 ± 74 | 887 ± 25 | 42.09 ± 1.21 |
| [O III] 5007 | 40.33 ± 0.01 | 228 ± 62 | 110 ± 25 | 124.18 ± 0.49 |
| He I Narrow | 38.33 ± 0.19 | 228 ± 62 | 95 ± 25 | 1.31 ± 0.72 |
| He I Broad | 38.78 ± 0.19 | 1937 ± 66 | 822 ± 26 | 3.69 ± 1.69 |
| [O I] 6300 | 39.02 ± 0.03 | 228 ± 62 | 95 ± 25 | 6.49 ± 0.27 |
| Hα Narrow | 39.82 ± 0.01 | 228 ± 62 | 95 ± 25 | 41.50 ± 0.32 |
| Hα Broad | 40.51 ± 0.01 | 2421 ± 65 | 879 ± 25 | 204.62 ± 0.91 |
| [N II] 6585 | 39.90 ± 0.01 | 228 ± 62 | 95 ± 25 | 50.12 ± 0.32 |
| [S II] 6718 | 39.43 ± 0.01 | 228 ± 62 | 95 ± 25 | 17.12 ± 0.26 |
| [S II] 6732 | 39.36 ± 0.01 | 228 ± 62 | 95 ± 25 | 14.54 ± 0.26 |
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 | 16.54 |
|---|---|
| Hβ Broad SNR | 5.15 |
| Hγ Broad SNR | 2.49 |
| AGN frac | 0.34 |
| Host frac | 0.66 |
| log L5100,Host | 42.22 |
| Fe II/Hβ | 0.76 |
| Fe II/[O III] | 0.26 |
Quality flags
spurious_hab/hbb | 0.0/0 |
|---|---|
l5100 | 1 |
balmer | 0 |
balmer_snr | 1 |
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.