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Title: Core or Cusps: The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1 [Core or Cusps: The Central Dark Matter Profile of a Redshift One Strong Lensing Cluster with a Bright Central Image]

Here, we report on SPT-CLJ2011-5228, a giant system of arcs created by a cluster at z = 1.06. The arc system is notable for the presence of a bright central image. The source is a Lyman break galaxy at z s = 2.39 and the mass enclosed within the Einstein ring of radius 14 arcsec is $$\sim {10}^{14.2}\ {M}_{\odot }$$. We perform a full reconstruction of the light profile of the lensed images to precisely infer the parameters of the mass distribution. The brightness of the central image demands that the central total density profile of the lens be shallow. By fitting the dark matter as a generalized Navarro–Frenk–White profile—with a free parameter for the inner density slope—we find that the break radius is $${270}_{-76}^{+48}$$ kpc, and that the inner density falls with radius to the power –0.38 ± 0.04 at 68% confidence. Such a shallow profile is in strong tension with our understanding of relaxed cold dark matter halos; dark matter-only simulations predict that the inner density should fall as $${r}^{-1}$$. The tension can be alleviated if this cluster is in fact a merger; a two-halo model can also reconstruct the data, with both clumps (density varying as $${r}^{-0.8}$$ and $${r}^{-1.0}$$) much more consistent with predictions from dark matter-only simulations. At the resolution of our Dark Energy Survey imaging, we are unable to choose between these two models, but we make predictions for forthcoming Hubble Space Telescope imaging that will decisively distinguish between them.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [2] ; ORCiD logo [1] ;  [1] ; ORCiD logo [2] ;  [1] ;  [3] ; ORCiD logo [4] ;  [2] ; ORCiD logo [5] ; ORCiD logo [6] ;  [7] ; ORCiD logo [8] ; ORCiD logo [9] ;  [2] ; ORCiD logo [2] ;  [10] ; ORCiD logo [11] ;  [12] more »;  [13] ; ORCiD logo [14] ;  [15] ;  [16] ;  [17] ;  [2] ;  [11] ;  [18] ;  [2] ;  [19] ; ORCiD logo [20] ; ORCiD logo [21] ; ORCiD logo [12] ;  [16] ;  [2] ; ORCiD logo [22] ;  [23] ;  [24] ;  [11] ;  [25] ;  [26] ;  [16] ;  [15] ; ORCiD logo [6] ; ORCiD logo [27] ;  [28] ; ORCiD logo [29] ;  [18] ; ORCiD logo [12] ; ORCiD logo [30] ;  [2] ;  [31] ;  [20] ;  [30] ; ORCiD logo [32] ;  [33] ;  [34] ; ORCiD logo [35] ; ORCiD logo [20] ;  [2] ; ORCiD logo [9] « less
  1. Univ. of Portsmouth, Portsmouth (United Kingdom)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. ETH Zurich, Zurich (Switzerland)
  4. ETH Zurich, Zurich (Switzerland); Univ. of California, Los Angeles, CA (United States)
  5. The Univ. of Tokyo, Chiba (Japan)
  6. Texas A & M Univ., College Station, TX (United States)
  7. Univ. of Sussex, Brighton (United Kingdom)
  8. Univ. of Manchester, Manchester (United Kingdom)
  9. National Optical Astronomy Observatory, La Serena (Chile)
  10. Institut d'Astrophysique de Paris, Paris (France); Univ. College London, London (United Kingdom)
  11. Univ. College London, London (United Kingdom)
  12. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  13. Univ. of Illinois, Urbana, IL (United States); National Center for Supercomputing Applications, Urbana, IL (United States)
  14. Institut de Ciencies de l'Espai, Barcelona (Spain)
  15. Univ. of Pennsylvania, Philadelphia, PA (United States)
  16. Lab. Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro (Brazil); Observatorio Nacional, Rio de Janeiro (Brazil)
  17. IIT Hyderabad, Telangana (India)
  18. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  19. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
  20. Univ. of Michigan, Ann Arbor, MI (United States)
  21. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  22. National Optical Astronomy Observatory, La Serena (Chile); Univ. of Washington, Seattle, WA (United States)
  23. Australian Astronomical Observatory, North Ryde, NSW (Australia)
  24. Argonne National Lab. (ANL), Lemont, IL (United States)
  25. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Texas A & M Univ., College Station, TX (United States)
  26. Lab. Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro (Brazil); Univ. de Sao Paulo, Sao Paulo (Brazil)
  27. The Ohio State Univ., Columbus, OH (United States)
  28. Princeton Univ., Princeton, NJ (United States)
  29. Institucio Catalana de Recerca i Estudis Avancats, Barcelona (Spain); The Barcelona Institute of Science and Technology, Bellaterra (Barcelona) (Spain)
  30. Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)
  31. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  32. Univ. of Southampton, Southampton (United Kingdom)
  33. Lab. Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro (Brazil); Univ. Estadual de Campinas, Campinas (Brazil)
  34. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  35. National Center for Supercomputing Applications, Urbana, IL (United States)
Publication Date:
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: 843; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; dark matter; galaxies: clusters: individual (SPT-CLJ2011-5228); galaxies: halos; gravitational lensing: strong
OSTI Identifier:
1374390