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Title: RCS2 J232727.6-020437: An efficient cosmic telescope at Z = 0.6986

Journal Article · · The Astrophysical Journal (Online)
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [1];  [4];  [4];  [6];  [7];  [8];  [1];  [9];  [10]
  1. Univ. of California, Davis, CA (United States)
  2. Space Telescope Science Institute, Baltimore, MD (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States)
  4. Argelander-Institut fur Astronomie, Bonn (Germany)
  5. Univ. of California, Santa Barbara, CA (United States)
  6. MMT Observatory, Tucson, AZ (United States)
  7. Aix-Marseille Univ., CNRS, LAM, Marseille (France)
  8. Stanford Univ., Stanford, CA (United States); Univ. of Copenhagen, Copenhagen (Denmark)
  9. UCLA, Los Angeles, CA (United States)
  10. Univ. of Arizona, Tucson, AZ (United States)
+ Show Author Affiliations

Here, we present a detailed gravitational lens model of the galaxy cluster RCS2 J232727.6-020437. Due to cosmological dimming of cluster members and ICL, its high redshift (z=0.6986) makes it ideal for studying background galaxies. Using new ACS and WFC3/IR HST data, we identify 16 multiple images. From MOSFIRE follow up, we identify a strong emission line in the spectrum of one multiple image, likely confirming the redshift of that system to z=2.083. With a highly magnified (μ ≳ 2) source plane area of ~ 0.7 arcmin2 at z = 7, RCS2 J232727.6-020437 has a lensing efficiency comparable to the Hubble Frontier Fields clusters. We discover four highly magnified z ~ 7 candidate Lyman-break galaxies behind the cluster, one of which may be multiply-imaged. Correcting for magnification, we find that all four galaxies are fainter than 0.5L*. One candidate is detected at >10σ in both Spitzer/IRAC [3.6] and [4.5] channels. A spectroscopic follow-up with MOSFIRE does not result in the detection of the Lyman-alpha emission line from any of the four candidates. From the MOSFIRE spectra we place median upper limits on the Lyman-alpha flux of 5 – 14 × 10–19 ergs–1cm–2 (5σ).

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1263393
Report Number(s):
SLAC-PUB-16641; arXiv:1503.02670
Journal Information:
The Astrophysical Journal (Online), Vol. 813, Issue 1; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (7)

The Frontier Fields lens modelling comparison project journal August 2017
RELICS: A Strong Lens Model for SPT-CLJ0615–5746, a z = 0.972 Cluster journal August 2018
Constraining the Neutral Fraction of Hydrogen in the IGM at Redshift 7.5 journal June 2019
The Atacama Cosmology Telescope: The Two-season ACTPol Sunyaev–Zel’dovich Effect Selected Cluster Catalog journal March 2018
The Frontier Fields Lens Modeling Comparison Project text January 2016
RELICS: A Strong Lens Model for SPT-CLJ0615-5746, a z=0.972 Cluster text January 2018
Constraining the neutral fraction of hydrogen in the IGM at redshift 7.5 text January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
.astrophysics
ASTRO
galaxies: clusters: individual (RCS2 J232727.6-020437)
galaxies: high-redshift
gravitational lensing: strong