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

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 arcmin 2 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).
Authors:
 [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)
Publication Date:
Report Number(s):
SLAC-PUB-16641
Journal ID: ISSN 1538-4357; arXiv:1503.02670
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 813; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; .astrophysics; ASTRO; galaxies: clusters: individual (RCS2 J232727.6-020437); galaxies: high-redshift; gravitational lensing: strong
OSTI Identifier:
1263393

Hoag, A., Bradac, M., Huang, K. H., Ryan, Jr., R. E., Sharon, K., Schrabback, T., Schmidt, K. B., Cain, B., Gonzalez, A. H., Hildebrandt, H., Hinz, J. L., Lemaux, B. C., Linden, A. von der, Lubin, L. M., Treu, T., and Zaritsky, D.. RCS2 J232727.6-020437: An efficient cosmic telescope at Z = 0.6986. United States: N. p., Web. doi:10.1088/0004-637X/813/1/37.
Hoag, A., Bradac, M., Huang, K. H., Ryan, Jr., R. E., Sharon, K., Schrabback, T., Schmidt, K. B., Cain, B., Gonzalez, A. H., Hildebrandt, H., Hinz, J. L., Lemaux, B. C., Linden, A. von der, Lubin, L. M., Treu, T., & Zaritsky, D.. RCS2 J232727.6-020437: An efficient cosmic telescope at Z = 0.6986. United States. doi:10.1088/0004-637X/813/1/37.
Hoag, A., Bradac, M., Huang, K. H., Ryan, Jr., R. E., Sharon, K., Schrabback, T., Schmidt, K. B., Cain, B., Gonzalez, A. H., Hildebrandt, H., Hinz, J. L., Lemaux, B. C., Linden, A. von der, Lubin, L. M., Treu, T., and Zaritsky, D.. 2015. "RCS2 J232727.6-020437: An efficient cosmic telescope at Z = 0.6986". United States. doi:10.1088/0004-637X/813/1/37. https://www.osti.gov/servlets/purl/1263393.
@article{osti_1263393,
title = {RCS2 J232727.6-020437: An efficient cosmic telescope at Z = 0.6986},
author = {Hoag, A. and Bradac, M. and Huang, K. H. and Ryan, Jr., R. E. and Sharon, K. and Schrabback, T. and Schmidt, K. B. and Cain, B. and Gonzalez, A. H. and Hildebrandt, H. and Hinz, J. L. and Lemaux, B. C. and Linden, A. von der and Lubin, L. M. and Treu, T. and Zaritsky, D.},
abstractNote = {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).},
doi = {10.1088/0004-637X/813/1/37},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 813,
place = {United States},
year = {2015},
month = {10}
}