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Title: The serendipitous observation of a gravitationally lensed galaxy at z = 0.9057 from the Blanco Cosmology Survey: the Elliot Arc

We report on the serendipitous discovery in the Blanco Cosmology Survey (BCS) imaging data of a z = 0.9057 galaxy that is being strongly lensed by a massive galaxy cluster at a redshift of z = 0.3838. The lens (BCS J2352-5452) was discovered while examining i- and z-band images being acquired in October 2006 during a BCS observing run. Follow-up spectroscopic observations with the GMOS instrument on the Gemini South 8m telescope confirmed the lensing nature of this system. Using weak plus strong lensing, velocity dispersion, cluster richness N200, and fitting to an NFW cluster mass density profile, we have made three independent estimates of the mass M200 which are all very consistent with each other. The combination of the results from the three methods gives M200 = (5.1 x 1.3) x 1014 circle_dot, which is fully consistent with the individual measurements. The final NFW concentration c200 from the combined fit is c200 = 5.4-1.1+1.4. We have compared our measurements of M200 and c200 with predictions for (a) clusters from λCDM simulations, (b) lensing selected clusters from simulations, and (c) a real sample of cluster lenses. We find that we are most compatible with the predictions for λCDM simulations formore » lensing clusters, and we see no evidence based on this one system for an increased concentration compared to λCDM. Finally, using the flux measured from the [OII]3727 line we have determined the star formation rate (SFR) of the source galaxy and find it to be rather modest given the assumed lens magnification.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] ;  [15] ;  [16] ;  [17]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Exeter (United Kingdom)
  3. Univ. of Illinois, Urbana-Champaign, IL (United States). National Center for Supercomputing Applications (NCSA)
  4. Univ. of North Dakota, Grand Forks, ND (United States)
  5. Centre National de la Recherche Scientifique (CNRS), Paris (France)
  6. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States);
  7. Univ. of Illinois, Urbana, IL (United States). Dept. of Astronomy
  8. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States). Dept. of Astronomy and Astrophysics
  9. Univ. of California, Davis, CA (United States). Observatories and Dept. of Astronomy
  10. Univ. of Chicago, IL (United States). Dept. of Astronomy and Astrophysics
  11. Ludwig Maximilian Univ., Munich (Germany); Excellence Cluster Univ., Garching (Germany); Max Planck Inst. fur Extraterrestrische Physik, Garching (Germany)
  12. Univ. of Tokyo (Japan). Inst. for Physics and Mathematics of the Universe; Academia Sinica, Tapei (Taiwan). Inst. of Astronomy and Astrophysics
  13. Univ. of Illinois, Urbana, IL (United States). Dept. of Astronomy; National Central Univ., Jhongli City (Taiwan). Graduate Inst. of Astronomy
  14. Space Telescope Science Inst., Baltimore, MD (United States)
  15. National Optical Astronomy Observatory, La Serena (Chile). Cerro Tololo Inter-American Observatory
  16. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
  17. Ludwig Maximilian Univ., Munich (Germany); Excellence Cluster Univ., Garching (Germany)
Publication Date:
OSTI Identifier:
1027478
Report Number(s):
FERMILAB-PUB-11-394-AE-CD
Journal ID: ISSN 0004-637X; arXiv eprint number arXiv:1108.4681; TRN: US201121%%473
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 742; Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; GALAXIES; GALAXY CLUSTERS; LENSES; STARS; TELESCOPES; VELOCITY