Fig. 2: Spectral modelling and physical properties of J1007_AGN.
From: A little red dot at z = 7.3 within a large galaxy overdensity
Left: posterior median of our model fit (bright red) compared with the J1007_AGN spectrum (black). Individual fitting components are highlighted with blue and green lines. Light coloured regions depict fit uncertainties (16th to 84th posterior percentile range). Insets: decomposition of the Hγ and Hβ emission lines (continuum model added to line components). Right: J1007_AGN (bright red diamonds) in comparison with z > 6 AGN1,6 (blue and green squares) and high-redshift quasars from the literature20 (grey points, systematic 1σ uncertainty in black) in the black hole mass versus bolometric luminosity plane. Error bars on the coloured data denote statistical 1σ uncertainties (or 16th to 84th percentiles of the posterior). We differentiate between the observed (filled diamond) and dereddened (\({A}_\mathrm{V}={2.79}_{-0.25}^{+0.25}\,{\rm{mag}}\); open diamond) measurements. Uncertainties on AV are consistently propagated and included in both bolometric luminosity and black hole mass. For display, we adopted the fiducial bolometric luminosity Lbol,Hβ and the SMBH mass estimate MBH,GH05,LHβ of Extended Data Tables 1 and 2, which are based on the Hβ emission-line properties (Methods).
