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CODEX clusters

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [5];  [6];  [1];  [8];  [6];  [9];  [6];  [10];  [7];  [11];  [12];  [13]
  1. Univ. of Helsinki (Finland). Dept. of Physics
  2. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics & Cosmology
  3. Univ. de Toulouse (France). IRAP
  4. INAF-Osservatorio Astronomico di Trieste, Trieste (Italy); IFPU-Inst. for Fundamental Physics of the Universe Trieste (Italy)
  5. Stockholm Univ. (Sweden). Dept. of Physics, Oskar Klein Centre
  6. Max Planck Inst. fuer Extraterrestrische Physik, Garching (Germany)
  7. Univ. of Helsinki (Finland). Dept. of Physics; Helsinki Inst. of Physics (Finland)
  8. Ministério da Ciência, Tecnologia, Inovação e Comunicações, Rio de Janeiro (Brazil). Observatório Nacional
  9. Inst. for Astronomy, Honolulu, HI (United States)
  10. Ecole Polytechnique Federale Lausanne, Versoix (Switzlerland). Lab. d’Astrophysique, Observatoire de Sauverny
  11. Univ. of Arizona, Tucson, AZ (United States). Dept. of Physics
  12. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy
  13. Univ. München (Germany); Max Planck Inst. fuer Extraterrestrische Physik, Garching (Germany)
+ Show Author Affiliations
Context: Large area catalogs of galaxy clusters constructed from ROSAT All-Sky Survey provide the basis for our knowledge of the population of clusters thanks to long-term multiwavelength efforts to follow up observations of these clusters. Aims: The advent of large area photometric surveys superseding previous, in-depth all-sky data allows us to revisit the construction of X-ray cluster catalogs, extending the study to lower cluster masses and higher redshifts and providing modeling of the selection function. Methods: We performed a wavelet detection of X-ray sources and made extensive simulations of the detection of clusters in the RASS data. We assigned an optical richness to each of the 24 788 detected X-ray sources in the 10 382 square degrees of the Baryon Oscillation Spectroscopic Survey area using red sequence cluster finder redMaPPer version 5.2 run on Sloan Digital Sky Survey photometry. We named this survey COnstrain Dark Energy with X-ray (CODEX) clusters. Results: We show that there is no obvious separation of sources on galaxy clusters and active galactic nuclei (AGN) based on the distribution of systems on their richness. This is a combination of an increasing number of galaxy groups and their selection via the identification of X-ray sources either by chance or by groups hosting an AGN. To clean the sample, we use a cut on the optical richness at the level corresponding to the 10% completeness of the survey and include it in the modeling of the cluster selection function. We present the X-ray catalog extending to a redshift of 0.6. Conclusions: The CODEX suvey is the first large area X-ray selected catalog of northern clusters reaching fluxes of 10–13 ergs s–1 cm–2. We provide modeling of the sample selection and discuss the redshift evolution of the high end of the X-ray luminosity function (XLF). Our results on z < 0.3 XLF agree with previous studies, while we provide new constraints on the 0.3 < z < 0.6 XLF. We find a lack of strong redshift evolution of the XLF, provide exact modeling of the effect of low number statistics and AGN contamination, and present the resulting constraints on the flat ΛCDM.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
Alfred P. Sloan Foundation; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1647240
Journal Information:
Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 638; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
catalogs
large-scale structure of universe
surveys