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Discovery of a Rich Cluster at z = 1.63 Using the Rest-frame 1.6 μm "Stellar Bump Sequence" Method

Muzzin, Adam and Wilson, Gillian and Demarco, Ricardo and Lidman, Chris and Nantais, Julie and Hoekstra, Henk and Yee, H. K. C. and Rettura, Alessandro (2013) Discovery of a Rich Cluster at z = 1.63 Using the Rest-frame 1.6 μm "Stellar Bump Sequence" Method. Astrophysical Journal, 767 (1). Art. No. 39. ISSN 0004-637X. doi:10.1088/0004-637X/767/1/39.

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We present a new two-color algorithm, the "Stellar Bump Sequence" (SBS), that is optimized for robustly identifying candidate high-redshift galaxy clusters in combined wide-field optical and mid-infrared (MIR) data. The SBS algorithm is a fusion of the well-tested cluster red-sequence method of Gladders & Yee with the MIR 3.6 μm-4.5 μm cluster detection method developed by Papovich. As with the cluster red-sequence method, the SBS identifies candidate overdensities within 3.6 μm-4.5 μm color slices, which are the equivalent of a rest-frame 1.6 μm stellar bump "red-sequence." In addition to employing the MIR colors of galaxies, the SBS algorithm incorporates an optical/MIR (z'-3.6 μm) color cut. This cut effectively eliminates foreground 0.2 <z < 0.4 galaxies which have 3.6 μm-4.5 μm colors that are similarly red as z > 1.0 galaxies and add noise when searching for high-redshift galaxy overdensities. We demonstrate using the z ~ 1 GCLASS cluster sample that similar to the red sequence, the stellar bump sequence appears to be a ubiquitous feature of high-redshift clusters, and that within that sample the color of the stellar bump sequence increases monotonically with redshift and provides photometric redshifts accurate to Δz = 0.05. We apply the SBS method in the XMM-LSS SWIRE field and show that it robustly recovers the majority of confirmed optical, MIR, and X-ray-selected clusters at z > 1.0 in that field. Lastly, we present confirmation of SpARCS J022427-032354 at z = 1.63, a new cluster detected with the method and confirmed with 12 high-confidence spectroscopic redshifts obtained using FORS2 on the Very Large Telescope. We conclude with a discussion of future prospects for using the algorithm.

Item Type:Article
Related URLs:
URLURL TypeDescription
Muzzin, Adam0000-0002-9330-9108
Wilson, Gillian0000-0002-6572-7089
Demarco, Ricardo0000-0003-3921-2177
Lidman, Chris0000-0003-1731-0497
Rettura, Alessandro0000-0002-5615-256X
Additional Information:© 2013 American Astronomical Society. Received 2012 November 13; accepted 2013 February 7; published 2013 March 22. G.W. gratefully acknowledges support from NSF grant AST-0909198. R.D. gratefully acknowledges the support provided by the BASAL Center for Astrophysics and Associated Technologies (CATA), and by FONDECYT grant No. 1100540.
Funding AgencyGrant Number
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1100540
Subject Keywords:galaxies: clusters: general; galaxies: high-redshift; infrared: galaxies; large-scale structure of universe
Issue or Number:1
Record Number:CaltechAUTHORS:20130503-131500306
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Official Citation:Discovery of a Rich Cluster at z = 1.63 Using the Rest-frame 1.6 μm "Stellar Bump Sequence" Method Adam Muzzin et al. 2013 ApJ 767 39
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38266
Deposited By: Ruth Sustaita
Deposited On:03 May 2013 20:41
Last Modified:09 Nov 2021 23:36

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