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

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [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.
+ Show Author Affiliations

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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
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
Grant/Contract Number:
SC0012704
OSTI ID:
1440887
Report Number(s):
BNL--205747-2018-JAAM
Journal Information:
Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2018; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Tomographic measurement of the intergalactic gas pressure through galaxy–tSZ cross-correlations journal December 2019
Dark matter decaying in the late Universe can relieve the H 0 tension journal June 2019
Ingredients for 21 cm Intensity Mapping journal October 2018
Ingredients for 21cm intensity mapping text January 2018

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79 ASTRONOMY AND ASTROPHYSICS