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Title: Bias of damped Lyman-α systems from their cross-correlation with CMB lensing

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 then 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 cross-correlation 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.

Authors:
 [1];  [2];  [3];  [4]
  1. Univ. of Oxford (United Kingdom). Dept. of Astrophysics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Physics Dept.; Georgia Inst. of Technology, Atlanta, GA (United States). School of Physics
  3. Univ. College London, Bloomsbury (United Kingdom). Dept. of Physics and Astronomy
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Physics Dept.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Simons Foundation, New York, NY (United States). Flatiron Inst. and Center for Computational Astrophysics (CCA); Science and Technology Facilities Council (STFC) (United Kingdom); Leverhulme Trust; Beecroft Trust
OSTI Identifier:
1440887
Report Number(s):
BNL-205747-2018-JAAM
Journal ID: ISSN 1475-7516; TRN: US1900813
Grant/Contract Number:  
SC0012704; ST/N003853/1
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2018; Journal Issue: 04; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Alonso, D., Colosimo, J., Font-Ribera, A., and Slosar, A. Bias of damped Lyman-α systems from their cross-correlation with CMB lensing. United States: N. p., 2018. Web. doi:10.1088/1475-7516/2018/04/053.
Alonso, D., Colosimo, J., Font-Ribera, A., & Slosar, A. Bias of damped Lyman-α systems from their cross-correlation with CMB lensing. United States. doi:10.1088/1475-7516/2018/04/053.
Alonso, D., Colosimo, J., Font-Ribera, A., and Slosar, A. Fri . "Bias of damped Lyman-α systems from their cross-correlation with CMB lensing". United States. doi:10.1088/1475-7516/2018/04/053. https://www.osti.gov/servlets/purl/1440887.
@article{osti_1440887,
title = {Bias of damped Lyman-α systems from their cross-correlation with CMB lensing},
author = {Alonso, D. and Colosimo, J. and Font-Ribera, A. and Slosar, A.},
abstractNote = {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 then 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 cross-correlation 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.},
doi = {10.1088/1475-7516/2018/04/053},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2018,
place = {United States},
year = {2018},
month = {4}
}

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