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- W4384116276 abstract "Abstract We analyse the rest-frame UV spectra of 2,531 high-redshift (3.5 < z < 4.0) quasars from the Sloan Digital Sky Survey DR16Q catalogue. In combination with previous work, we study the redshift evolution of the rest-frame UV line properties across the entire redshift range, 1.5 < z < 4.0. We improve the systemic redshift estimates at z > 3.5 using a cross-correlation algorithm that employs high signal-to-noise template spectra spanning the full range in UV emission line properties. We then quantify the evolution of C iv and He ii emission line properties with redshift. The increase in C iv blueshifts with cosmological redshift can be fully explained by the higher luminosities of quasars observed at high redshifts. We recover broadly similar trends between the He ii EW and C iv blueshift at both 1.5 < z < 2.65 and 3.5 < z < 4.0 suggesting that the blueshift depends systematically on the spectral energy density (SED) of the quasar and there is no evolution in the SED over the redshift range 1.5 < z < 4.0. C iv blueshifts are highest when L/L$_rm {Edd} ge$ 0.2 and M bh ≥109M⊙ for the entire 1.5 < z < 4.0 sample. We find that luminosity matching samples as a means to explore the evolution of their rest-frame UV emission line properties is only viable if the samples are also matched in the M bh - L/L$_rm {Edd}$ plane. Quasars at z ≥ 6 are on average less massive and have higher Eddington-scaled accretion rates than their luminosity-matched counterparts at 1.5 < z < 4.0, which could explain the observed evolution in their UV line properties." @default.
- W4384116276 created "2023-07-13" @default.
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- W4384116276 date "2023-07-12" @default.
- W4384116276 modified "2023-10-17" @default.
- W4384116276 title "No redshift evolution in the rest-frame UV emission line properties of quasars from <i>z</i> = 1.5 to <i>z</i> = 4.0" @default.
- W4384116276 doi "https://doi.org/10.1093/mnras/stad2060" @default.
- W4384116276 hasPublicationYear "2023" @default.
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