Cluster Cosmology with the Velocity Distribution Function of the HeCS-SZ Sample

Ntampaka, Michelle; Rines, Ken; Trac, Hy

doi:10.3847/1538-4357/ab2a00

Title: Cluster Cosmology with the Velocity Distribution Function of the HeCS-SZ Sample

Journal Article · Mon Aug 05 00:00:00 EDT 2019 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab2a00· OSTI ID:1611605

^[1]; Rines, Ken ^[2];

^[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)

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.

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Research Organization:: Carnegie Mellon Univ., Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0011114

OSTI ID:: 1611605

Journal Information:: The Astrophysical Journal (Online), Vol. 880, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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