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This content will become publicly available on August 20, 2017

Title: Comparing Dark Energy Survey and HST –CLASH observations of the galaxy cluster RXC J2248.7–4431: Implications for stellar mass versus dark matter

We derive the stellar mass fraction in the galaxy cluster RXC J2248.7–4431 observed with the Dark Energy Survey (DES) during the Science Verification period. We compare the stellar mass results from DES (five filters) with those from the Hubble Space Telescope Cluster Lensing And Supernova Survey (CLASH; 17 filters). When the cluster spectroscopic redshift is assumed, we show that stellar masses from DES can be estimated within 25 per cent of CLASH values. We compute the stellar mass contribution coming from red and blue galaxies, and study the relation between stellar mass and the underlying dark matter using weak lensing studies with DES and CLASH. An analysis of the radial profiles of the DES total and stellar mass yields a stellar-to-total fraction of f* = (6.8 ± 1.7) × 10–3 within a radius of r200c ≃ 2 Mpc. Our analysis also includes a comparison of photometric redshifts and star/galaxy separation efficiency for both data sets. We conclude that space-based small field imaging can be used to calibrate the galaxy properties in DES for the much wider field of view. In conclusion, the technique developed to derive the stellar mass fraction in galaxy clusters can be applied to the ~100 000more » clusters that will be observed within this survey and yield important information about galaxy evolution.« less
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Publication Date:
OSTI Identifier:
1333879
Grant/Contract Number:
AC02-SF00515; FP7/291329; PF5-160138; SC0013541; Number AST-1138766; AYA2012-39559, ESP2013-48274, FPA2013-47986; FP7/2007-2013; 240672, 291329, and 306478
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 463; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS surveys; galaxies: clusters: general; galaxies: evolution; galaxies: photometry