Youles, Samantha;
Bautista, Julian E;
Font-Ribera, Andreu;
Bacon, David;
Rich, James;
Brooks, David;
Davis, Tamara M;
... Walther, Michael; + view all
(2022)
The effect of quasar redshift errors on Lyman-α forest correlation functions.
Monthly Notices of the Royal Astronomical Society
, 516
(1)
pp. 421-433.
10.1093/mnras/stac2102.
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Abstract
Using synthetic Lyman-α forests from the Dark Energy Spectroscopic Instrument (DESI) survey, we present a study of the impact of errors in the estimation of quasar redshift on the Lyman-α correlation functions. Estimates of quasar redshift have large uncertainties of a few hundred km s−1 due to the broadness of the emission lines and the intrinsic shifts from other emission lines. We inject Gaussian random redshift errors into the mock quasar catalogues, and measure the auto-correlation and the Lyman-α-quasar cross-correlation functions. We find a smearing of the BAO feature in the radial direction, but changes in the peak position are negligible. However, we see a significant unphysical correlation for small separations transverse to the line of sight which increases with the amplitude of the redshift errors. We interpret this contamination as a result of the broadening of emission lines in the measured mean continuum, caused by quasar redshift errors, combined with the unrealistically strong clustering of the simulated quasars on small scales.
| Type: | Article |
|---|---|
| Title: | The effect of quasar redshift errors on Lyman-α forest correlation functions |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stac2102 |
| Publisher version: | https://doi.org/10.1093/mnras/stac2102 |
| Language: | English |
| Additional information: | © The Author(s) 2022. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | cosmology, large-scale structure of Universe |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10153523 |
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