Modelling projection effects in optically selected cluster catalogues
[4];
[6];
[3];
[7];
- Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München, Scheiner str 1, D-81679 München, Germany
- Department of Physics, University of Arizona, Tucson, AZ 85721, USA
- Kavli Institute for Particle Astrophysics & Cosmology, P. O. Box 2450, Stanford University, Stanford, CA 94305, USA, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA
- Santa Cruz Institute for Particle Physics, Santa Cruz, CA 95064, USA
- Kavli Institute for Particle Astrophysics & Cosmology, P. O. Box 2450, Stanford University, Stanford, CA 94305, USA, Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA
- Department of Physics, McWilliams Center for Cosmology, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München, Scheiner str 1, D-81679 München, Germany, Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching, Germany
- Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München, Scheiner str 1, D-81679 München, Germany, Fermi National Accelerator Laboratory, P. O. Box 500, Batavia, IL 60510, USA
- Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München, Scheiner str 1, D-81679 München, Germany, Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching, Germany, Excellence Cluster Universe, Boltzmann str 2, D-85748 Garching, Germany
- Kavli Institute for Particle Astrophysics & Cosmology, P. O. Box 2450, Stanford University, Stanford, CA 94305, USA, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA, Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA
- Laboratorio Interinstitucional de e-Astronomia - LineA, Rua General Jose Cristino, 77, Rio de Janeiro, RJ 20921-400, Brazil
The cosmological utility of galaxy cluster catalogues is primarily limited by our ability to calibrate the relation between halo mass and observable mass proxies such as cluster richness, X-ray luminosity or the Sunyaev-Zeldovich signal. Projection effects are a particularly pernicious systematic effect that can impact observable mass proxies; structure along the line of sight can both bias and increase the scatter of the observable mass proxies used in cluster abundance studies. In this work, we develop an empirical method to characterize the impact of projection effects on redMaPPer cluster catalogues. We use numerical simulations to validate our method and illustrate its robustness. We demonstrate that modeling of projection effects is a necessary component for cluster abundance studies capable of reaching $$\approx 5\%$$ mass calibration uncertainties (e.g. the Dark Energy Survey Year 1 sample). Specifically, ignoring the impact of projection effects in the observable--mass relation --- i.e. marginalizing over a log-normal model only --- biases the posterior of the cluster normalization condition $$S_8 \equiv \sigma_8 (\Omega_{\rm m}/0.3)^{1/2}$$ by $$\Delta S_8 =0.05$$, more than twice the uncertainty in the posterior for such an analysis.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- DES
- Grant/Contract Number:
- SC0015975; AC02-76SF00515; FG-2016-6443; PF5-160138; NAS8-03060; SC0010118; AST-1138766; AST-1536171; AYA2015-71825; ESP2015-66861; FPA2015-68048; SEV-2016-0588; SEV-2016-0597; MDM-2015-0509; FP7/2007-2013; 240672; 291329; 306478; CE110001020; AC02-07CH11359
- OSTI ID:
- 1479165
- Alternate ID(s):
- OSTI ID: 1493428; OSTI ID: 1497406
- Report Number(s):
- arXiv:1807.07072; FERMILAB-PUB-18-325; DES-2017-0318
- Journal Information:
- Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 482 Journal Issue: 1; ISSN 0035-8711
- Publisher:
- Oxford University PressCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Web of Science
Similar Records
Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters
μ⋆ masses: weak-lensing calibration of the Dark Energy Survey Year 1 redMaPPer clusters using stellar masses