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Calibrating the Planck Cluster Mass Scale with Cluster Velocity Dispersions

Amodeo, Stefania and Mei, Simona and Stanford, Spencer A. and Bartlett, James G. and Melin, Jean-Baptiste and Lawrence, Charles R. and Chary, Ranga-Ram and Shim, Hyunjin and Marleau, Francine and Stern, Daniel (2017) Calibrating the Planck Cluster Mass Scale with Cluster Velocity Dispersions. Astrophysical Journal, 844 (2). Art. No. 101. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20170728-104418152

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Abstract

We measure the Planck cluster mass bias using dynamical mass measurements based on velocity dispersions of a subsample of 17 Planck-detected clusters. The velocity dispersions were calculated using redshifts determined from spectra that were obtained at the Gemini observatory with the GMOS multi-object spectrograph. We correct our estimates for effects due to finite aperture, Eddington bias, and correlated scatter between velocity dispersion and the Planck mass proxy. The result for the mass bias parameter, (1 – b), depends on the value of the galaxy velocity bias, b_v, adopted from simulations: (1 – b) = (0.51 ± 0.09) b^3_v. Using a velocity bias of b_v = 1.08 from Munari et al., we obtain (1 – b) = 0.64 ± 0.11, i.e., an error of 17% on the mass bias measurement with 17 clusters. This mass bias value is consistent with most previous weak-lensing determinations. It lies within 1σ of the value that is needed to reconcile the Planck cluster counts with the Planck primary cosmic microwave background constraints. We emphasize that uncertainty in the velocity bias severely hampers the precision of the measurements of the mass bias using velocity dispersions. On the other hand, when we fix the Planck mass bias using the constraints from Penna–Lima et al., based on weak-lensing measurements, we obtain a positive velocity bias of b_v ≳ 0.9 at 3σ.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/aa7063DOIArticle
http://iopscience.iop.org/article/10.3847/1538-4357/aa7063/metaPublisherArticle
https://arxiv.org/abs/1704.07891arXivDiscussion Paper
ORCID:
AuthorORCID
Mei, Simona0000-0002-2849-559X
Chary, Ranga-Ram0000-0001-7583-0621
Stern, Daniel0000-0003-2686-9241
Additional Information:© 2017 The American Astronomical Society. Received 2016 October 18; revised 2017 April 20; accepted 2017 April 27; published 2017 July 27. We thank our referee, Gus Evrard, for constructive discussion that helped improve the presentation of this work. We thank Andrea Biviano and Ian McCarthy for useful discussions. Based on observations obtained at the Gemini Observatory (Programs GN-2011A-Q-119, GN-2011B-Q-41, and GS-2012A-Q-77; P.I. J.G. Bartlett), which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnologa e Innovacin Productiva (Argentina), and Ministrio da Cincia, and Tecnologia e Inovao (Brazil). Supported by the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., on behalf of the international Gemini partnership of Argentina, Brazil, Canada, Chile, and the United States of America. This material is based upon work supported by AURA through the National Science Foundation under AURA Cooperative Agreement AST 0132798 as amended. J.G.B. and S.M. acknowledge financial support from the Institut Universitaire de France (IUF) as senior members. The work of J.G.B., C.L., and D.S. was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. The research of S.M. was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, administered by Universities Space Research Association under contract with NASA. Facilities: Gemini:South, Gemini:Gillet, Hale, Planck.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NSFAST-0132798
Institut Universitaire de France (IUF)UNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:cosmic background radiation – cosmology: observations – galaxies: clusters: general – galaxies: distances and redshifts
Issue or Number:2
Record Number:CaltechAUTHORS:20170728-104418152
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170728-104418152
Official Citation:Stefania Amodeo et al 2017 ApJ 844 101
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79537
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Jul 2017 23:17
Last Modified:03 Oct 2019 18:21

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