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Title: THE SDSS-IV EXTENDED BARYON OSCILLATION SPECTROSCOPIC SURVEY: QUASAR TARGET SELECTION

As part of the Sloan Digital Sky Survey (SDSS) IV the extended Baryon Oscillation Spectroscopic Survey (eBOSS) will improve measurements of the cosmological distance scale by applying the Baryon Acoustic Oscillation (BAO) method to quasar samples. eBOSS will adopt two approaches to target quasars over 7500 deg 2 . First, a "CORE" quasar sample will combine the optical selection in ugriz using a likelihood-based routine called XDQSOz, with a mid-IR-optical color cut. eBOSS CORE selection (to g < 22 or r < 22) should return ~70 deg -2 quasars at redshifts 0.9 < z < 2.2 and ~7 deg -2 z > 2.1 quasars. Second, a selection based on variability in multi-epoch imaging from the Palomar Transient Factory should recover an additional ~3-4 deg -2 z > 2.1 quasars to g < 22.5. A linear model of how imaging systematics affect target density recovers the angular distribution of eBOSS CORE quasars over 96.7% (76.7%) of the SDSS north (south) Galactic Cap area. The eBOSS CORE quasar sample should thus be sufficiently dense and homogeneous over 0.9 < z < 2.2 to yield the first few-percent-level BAO constraint near eBOSS quasars at z > 2.1 will be used to improve BAOmore » measurements in the Lyα Forest. Beyond its key cosmological goals, eBOSS should be the next-generation quasar survey, comprising > 500,000 new quasars and > 500,000 uniformly selected spectroscopically confirmed 0.9 < z < 2.2 quasars. At the conclusion of eBOSS, the SDSS will have provided unique spectra for more than 800,000 quasars.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [6] ;  [7] ;  [8] ;  [3] ;  [9] ;  [10] ;  [2] ;  [11] ;  [12] ;  [13] ;  [14] ;  [2] ;  [5] ;  [2] more »;  [15] ;  [16] ;  [17] ;  [18] ;  [18] ;  [18] ;  [19] ;  [15] ;  [20] ;  [21] ;  [22] ;  [23] ;  [24] ;  [25] ;  [26] ;  [27] ;  [28] « less
  1. Univ. of Wyoming, Laramie, WY (United States)
  2. Alternative Energies and Atomic Energy Commission (CEA), Gif-sur-Yvette (France)
  3. Univ. of Pittsburgh, PA (United States)
  4. Istituto Nazionale di Astrofisica (INAF), Trieste (Italy)
  5. Univ. of Utah, Salt Lake City, UT (United States)
  6. Univ. of Toronto, ON (Canada)
  7. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  9. National Centre for Scientific Research-Mixed Organizations (CNRS-UMR), Paris (France)
  10. Ecole Polytechnique Federale Lausanne (Switzlerland); Aix-Marseille Univ., and CNRS/IN2P3, Marseille (France)
  11. Univ. of Portsmouth (United Kingdom)
  12. The Ohio State Univ., Columbus, OH (United States); Univ. of Portsmouth (United Kingdom)
  13. Ohio Univ., Athens, OH (United States)
  14. New York Univ. (NYU), NY (United States)
  15. Univ. of Arizona, Tucson, AZ (United States)
  16. Univ. Autonoma de Madrid (Spain)
  17. Carnegie Inst. of Science, Pasadena, CA (United States)
  18. California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States)
  19. Harvard Univ., Cambridge, MA (United States)
  20. California Inst. of Technology (CalTech), Pasadena, CA (United States); Weizmann Inst. of Science, Rehovot (Israel)
  21. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  22. Weizmann Inst. of Science, Rehovot (Israel)
  23. Sejong Univ., Seoul (Korea, Republic of)
  24. Univ. of Washington, Seattle, WA (United States)
  25. Pennsylvania State Univ., University Park, PA (United States)
  26. Max Planck Inst. fur Astronomie, Heidelberg (Germany)
  27. Univ. de la La Laguna, Tenerife (Spain); Inst. de Astrofisicia de Canarias (IAC), Tenerife (Spain)
  28. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Supplement Series (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal. Supplement Series (Online); Journal Volume: 221; Journal Issue: 2; Journal ID: ISSN 1538-4365
Publisher:
American Astronomical Society/IOP
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1378680