Quasars as standard candles - IV. Analysis of the X-ray and UV indicators of the disc-corona relation

Open Access

Fig. 1.

Example of UV spectrum together with the best fit (yellow line) and the various spectral components. The QSFit code assumes, for calculating luminosities, a standard ΛCDM cosmology with H₀ = 70 km s⁻¹ Mpc⁻¹, Ω_M = 0.3, and Ω_Λ = 0.7 (Calderone et al. 2017).

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