Alonso, D;
Colosimo, J;
Font-Ribera, A;
Slosar, A;
(2018)
Bias of damped Lyman-alpha systems from their cross-correlation with CMB lensing.
Journal of Cosmology and Astroparticle Physics
, 2018
, Article 53. 10.1088/1475-7516/2018/04/053.
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Abstract
We cross-correlate the positions of damped Lyman-α systems (DLAs) and their parent quasar catalog with a convergence map derived from the Planck cosmic microwave background (CMB) temperature data. We make consistent measurements of the lensing signal of both samples in both Fourier and configuration space. By interpreting the excess signal present in the DLA catalog with respect to the parent quasar catalog as caused by the large scale structure traced by DLAs, we are able to infer the bias of these objects: bDLA = 2.6 ± 0.9. These results are consistent with previous measurements made in crosscorrelation with the Lyman-α forest, although the current noise in the lensing data and the low number density of DLAs limits the constraining power of this measurement. We discuss the robustness of the analysis with respect to a number different systematic effects and forecast prospects of carrying out this measurement with data from future experiments.
| Type: | Article |
|---|---|
| Title: | Bias of damped Lyman-alpha systems from their cross-correlation with CMB lensing |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1475-7516/2018/04/053 |
| Publisher version: | https://doi.org/10.1088/1475-7516/2018/04/053 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gravitational lensing, Lyman alpha forest, redshift surveys |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS 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 |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10056620 |
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