Cluster Cosmology with the Velocity Distribution Function of the HeCS-SZ Sample
Abstract
We apply the velocity distribution function (VDF) to a sample of Sunyaev–Zel'dovich (SZ)-selected clusters, and we report preliminary cosmological constraints in the $${\sigma }_{8}$$-$${{\rm{\Omega }}}_{m}$$ cosmological parameter space. The VDF is a forward-modeled test statistic that can be used to constrain cosmological models directly from galaxy cluster dynamical observations. The method was introduced in Ntampaka et al. and employs line-of-sight velocity measurements to directly constrain cosmological parameters; it is less sensitive to measurement error than a standard halo mass function approach. The method is applied to the Hectospec Survey of Sunyaev–Zeldovich-Selected Clusters sample, which is a spectroscopic follow-up of a Planck-selected sample of 83 galaxy clusters. Credible regions are calculated by comparing the VDF of the observed cluster sample to that of mock observations, yielding $${{ \mathcal S }}_{8}$$ $$\equiv \,{\sigma }_{8}{\left({{\rm{\Omega }}}_{m}/0.3\right)}^{0.25}=0.751\pm 0.037$$. These constraints are in tension with the Planck Cosmic Microwave Background TT fiducial value, which lies outside of our 95% credible region, but are in agreement with some recent analyses of large-scale structure that observe fewer massive clusters than are predicted by the Planck fiducial cosmological parameters.
- Authors:
-
[1];
[3]
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Harvard Univ., Cambridge, MA (United States)
- Western Washington Univ., Bellingham, WA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Publication Date:
- Research Org.:
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1611605
- Grant/Contract Number:
- SC0011114
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 880; Journal Issue: 2; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics
Citation Formats
Ntampaka, Michelle, Rines, Ken, and Trac, Hy. Cluster Cosmology with the Velocity Distribution Function of the HeCS-SZ Sample. United States: N. p., 2019.
Web. doi:10.3847/1538-4357/ab2a00.
Ntampaka, Michelle, Rines, Ken, & Trac, Hy. Cluster Cosmology with the Velocity Distribution Function of the HeCS-SZ Sample. United States. https://doi.org/10.3847/1538-4357/ab2a00
Ntampaka, Michelle, Rines, Ken, and Trac, Hy. Mon .
"Cluster Cosmology with the Velocity Distribution Function of the HeCS-SZ Sample". United States. https://doi.org/10.3847/1538-4357/ab2a00. https://www.osti.gov/servlets/purl/1611605.
@article{osti_1611605,
title = {Cluster Cosmology with the Velocity Distribution Function of the HeCS-SZ Sample},
author = {Ntampaka, Michelle and Rines, Ken and Trac, Hy},
abstractNote = {We apply the velocity distribution function (VDF) to a sample of Sunyaev–Zel'dovich (SZ)-selected clusters, and we report preliminary cosmological constraints in the ${\sigma }_{8}$-${{\rm{\Omega }}}_{m}$ cosmological parameter space. The VDF is a forward-modeled test statistic that can be used to constrain cosmological models directly from galaxy cluster dynamical observations. The method was introduced in Ntampaka et al. and employs line-of-sight velocity measurements to directly constrain cosmological parameters; it is less sensitive to measurement error than a standard halo mass function approach. The method is applied to the Hectospec Survey of Sunyaev–Zeldovich-Selected Clusters sample, which is a spectroscopic follow-up of a Planck-selected sample of 83 galaxy clusters. Credible regions are calculated by comparing the VDF of the observed cluster sample to that of mock observations, yielding ${{ \mathcal S }}_{8}$ $\equiv \,{\sigma }_{8}{\left({{\rm{\Omega }}}_{m}/0.3\right)}^{0.25}=0.751\pm 0.037$. These constraints are in tension with the Planck Cosmic Microwave Background TT fiducial value, which lies outside of our 95% credible region, but are in agreement with some recent analyses of large-scale structure that observe fewer massive clusters than are predicted by the Planck fiducial cosmological parameters.},
doi = {10.3847/1538-4357/ab2a00},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 880,
place = {United States},
year = {Mon Aug 05 00:00:00 EDT 2019},
month = {Mon Aug 05 00:00:00 EDT 2019}
}
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Figures / Tables:
Figure 1: Left: the redshift and SZ mass (M500,SZ) distribution of one sample mock observation (red circles) and that of the HECS-SZ sample with b=0 (blue x’s). The selection function with b=0 (solid black curve) shows the limit above which the sample is modeled to have integral completeness $\mathcal{C}\in$ [0.6,more »
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Works referencing / citing this record:
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