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Mass–Richness Relations for X-Ray and SZE-selected Clusters at 0.4 < z < 2.0 as Seen by Spitzer at 4.5 μm

Rettura, A. and Chary, R. and Krick, J. and Ettori, S. (2018) Mass–Richness Relations for X-Ray and SZE-selected Clusters at 0.4 < z < 2.0 as Seen by Spitzer at 4.5 μm. Astrophysical Journal, 867 (1). Art. No. 12. ISSN 1538-4357. doi:10.3847/1538-4357/aad818.

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We study the mass–richness relation of 116 spectroscopically confirmed massive clusters at 0.4 < z < 2 by mining the Spitzer archive. We homogeneously measure the richness at 4.5 μm for our cluster sample within a fixed aperture of 2' radius and above a fixed brightness threshold, making appropriate corrections for both background galaxies and foreground stars. We have two subsamples, those which have (a) literature X-ray luminosities and (b) literature Sunyaev–Zel'dovich effect masses. For the X-ray subsample we re-derive masses adopting the most recent calibrations. We then calibrate an empirical mass–richness relation for the combined sample spanning more than one decade in cluster mass and find the associated uncertainties in mass at fixed richness to be ±0.25 dex. We study the dependence of the scatter of this relation with galaxy concentration, defined as the ratio between richness measured within an aperture radius of 1 and 2 arcmin. We find that at fixed aperture radius the scatter increases for clusters with higher concentrations. We study the dependence of our richness estimates with depth of the 4.5 μm imaging data and find that reaching a depth of at least [4.5] = 21 AB mag is sufficient to derive reasonable mass estimates. We discuss the possible extension of our method to the mid-infrared WISE All Sky Survey data and the application of our results to the Euclid mission. This technique makes richness-based cluster mass estimates available for large samples of clusters at very low observational cost.

Item Type:Article
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URLURL TypeDescription Paper
Rettura, A.0000-0002-5615-256X
Chary, R.0000-0001-7583-0621
Ettori, S.0000-0003-4117-8617
Additional Information:© 2018. The American Astronomical Society. Received 2016 August 31; revised 2018 July 31; accepted 2018 August 1; published 2018 October 25. A.R. is grateful to the Spitzer Archival Team for providing access to advanced data products and is thankful to Dr. Peter Capak for providing access to the SEIP photometry pipeline. A.R. is grateful to Drs. M. Nonino, L. Girardi for discussions and providing access to the TRILEGAL model runs. A.R. is grateful to Drs. Mark Brodwin, Anthony Gonzalez, Ben Maughan, Adam Mantz, Mauro Sereno, Veronica Strazzullo, and Loredana Vetere for interesting discussions, comments, and suggestions that improved this manuscript. This work is based on data obtained with the Spitzer Space Telescope, which is operated by the Jet Propulsion Lab (JPL), California Institute of Technology (Caltech), under a contract with NASA. Support was provided by NASA through contract number 1439211 and 1484822 issued by JPL/Caltech. Facilities: Spitzer - Spitzer Space Telescope satellite, WISE - , IRSA - , ROSAT - , CXO - , XMM - , SPT - , Planck - , CARMA. -
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:cosmology: observations; galaxies: clusters: general; galaxies: high-redshift; galaxies: statistics; infrared: galaxies; large-scale structure of universe
Issue or Number:1
Record Number:CaltechAUTHORS:20181029-094838393
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Official Citation:A. Rettura et al 2018 ApJ 867 12
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90454
Deposited By: George Porter
Deposited On:29 Oct 2018 17:54
Last Modified:16 Nov 2021 03:32

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