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Title: A stellar overdensity associated with the Small Magellanic Cloud

Here, we report the discovery of a stellar overdensity 8° north of the centre of the Small Magellanic Cloud (SMC; Small Magellanic Cloud Northern Over-Density; SMCNOD), using data from the first 2 yr of the Dark Energy Survey (DES) and the first year of the MAGellanic SatelLITEs Survey (MagLiteS). The SMCNOD is indistinguishable in age, metallicity and distance from the nearby SMC stars, being primarily composed of intermediate-age stars (6 Gyr, Z = 0.001), with a small fraction of young stars (1 Gyr, Z = 0.01). The SMCNOD has an elongated shape with an ellipticity of 0.6 and a size of ~6° × 2°. It has an absolute magnitude of MV ≅ –7.7, rh = 2.1 kpc, and μV(r < rh) = 31.2 mag arcsec –2. We estimate a stellar mass of ~10 5 M⊙, following a Kroupa mass function. The SMCNOD was probably removed from the SMC disc by tidal stripping, since it is located near the head of the Magellanic Stream, and the literature indicates likely recent Large Magellanic Cloud-SMC encounters. This scenario is supported by the lack of significant H i gas. Other potential scenarios for the SMCNOD origin are a transient overdensity within the SMC tidalmore » radius or a primordial SMC satellite in advanced stage of disruption.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [2] ;  [14] ;  [1] ;  [15] ;  [16] ;  [11] more »;  [17] ;  [18] ;  [18] ;  [19] ;  [19] ;  [19] ;  [20] ;  [16] ;  [21] ;  [2] ;  [2] ;  [22] ;  [19] ;  [23] ;  [24] ;  [25] ;  [26] ;  [27] ;  [2] ;  [28] ;  [2] ;  [29] ;  [30] ;  [31] ;  [23] ;  [19] ;  [2] ;  [32] ;  [33] ;  [34] ;  [2] ;  [23] ;  [35] ;  [36] ;  [37] ;  [38] ;  [39] ;  [2] ;  [40] ;  [39] ;  [16] ;  [2] ;  [41] ;  [42] ;  [43] ;  [40] ;  [2] ;  [2] « less
  1. Univ. Federal do Rio Grande do Sul, Porto Alegre (Brazil); Lab. Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro (Brazil)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Large Synoptic Survey Telescope, Tucson, AZ (United States)
  4. Space Telescope Science Institute, Baltimore, MD (United States)
  5. Univ. of Arizona, Tucson, AZ (United States)
  6. Univ. de Strasbourg, Strasbourg (France); Max-Planck-Institut fur Astronomie, Heidelberg (Germany)
  7. Univ. of Cambridge, Cambridge (United Kingdom)
  8. Instituto de Astrofisica de Canarias, Canary Islands (Spain); Univ. of La Laguna, Canary Islands (Spain)
  9. Zentrum fur Astronomie der Univ. Heidelberg, Heidelberg (Germany)
  10. Texas A & M Univ., College Station, TX (United States)
  11. Univ. of Surrey, Guildford (United Kingdom)
  12. Univ. of Virginia, Charlottesville, VA (United States)
  13. Univ. of Hertfordshire, Hatfield (United Kingdom); Leibnitz-Institut fur Astrophysik Potsdam, Potsdam (Germany)
  14. ETH Zurich, Zurich (Switzerland)
  15. Mount Stromlo Observatory, Weston Creek, ACT (Australia)
  16. Cerro Tololo Inter-American Observatory, La Serena (Chile)
  17. Univ. of Colorado, Boulder, CO (United States)
  18. National Optical Astronomy Observatory, Tucson, AZ (United States)
  19. Lab. Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro (Brazil); Observatorio Nacional, Rio de Janeiro (Brazil)
  20. Lab. Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro (Brazil)
  21. Rhodes Univ., Grahamstown (South Africa); Univ. College London, London (United Kingdom)
  22. Univ. College London, London (United Kingdom); Institut d'Astrophysique de Paris, Paris (France); Sorbonne Univ., Paris (France)
  23. Univ. of Illinois, Urbana, IL (United States); National Center for Supercomputing Applications, Urbana, IL (United States)
  24. Institut de Ciencies de l'Espai, Barcelona (Spain); Univ. Autonoma de Madrid, Madrid (Spain)
  25. Stanford Univ., Stanford, CA (United States)
  26. Univ. of Portsmouth, Portsmouth (United Kingdom); Univ. of Southampton, Southampton (United Kingdom)
  27. IIT Hyderabad, Telangana (India)
  28. Univ. College London, London (United Kingdom)
  29. Institut de Ciencies de l'Espai, Barcelona (Spain)
  30. Univ. Autonoma de Madrid, Madrid (Spain)
  31. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  32. The Ohio State Univ., Columbus, OH (United States)
  33. Cerro Tololo Inter-American Observatory, La Serena (Chile); Univ. of Washington, Seattle, WA (United States)
  34. Australian Astronomical Observatory, North Ryde, NSW (Australia)
  35. Institucio Catalana de Recerca i Estudis Avancats, Barcelona (Spain); The Barcelona Institute of Science and Technology, Bellaterra (Barcelona) (Spain)
  36. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  37. Univ. of Sussex, Brighton (United Kingdom)
  38. Univ. of Pennsylvania, Philadelphia, PA (United States)
  39. Centro de Investigaciones Energeticas Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)
  40. Univ. of Michigan, Ann Arbor, MI (United States)
  41. Lab. Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro (Brazil); Univ. Federal do ABC, Santo Andre (Brazil)
  42. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  43. National Center for Supercomputing Applications, Urbana, IL (United States)
Publication Date:
Report Number(s):
arXiv:1612.03938; FERMILAB-PUB-16-689-AE-CD
Journal ID: ISSN 0035-8711; TRN: US1700674
Grant/Contract Number:
AC05-00OR22725; AC02-07CH11359; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 468; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
DES; DES Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: interactions; Magellanic Clouds; Galaxies; Magellanic clouds
OSTI Identifier:
1362063
Alternate Identifier(s):
OSTI ID: 1352816; OSTI ID: 1367848