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Title: Galaxy clusters in the SDSS Stripe 82 based on photometric redshifts

Based on a recent photometric redshift galaxy catalogue, we have searched for galaxy clusters in the Stripe ~82 region of the Sloan Digital Sky Survey by applying the Adami & MAzure Cluster FInder (AMACFI). Extensive tests were made to fine-tune the AMACFI parameters and make the cluster detection as reliable as possible. The same method was applied to the Millennium simulation to estimate our detection efficiency and the approximate masses of the detected clusters. Considering all the cluster galaxies (i.e. within a 1 Mpc radius of the cluster to which they belong and with a photoz differing by less than 0.05 from that of the cluster), we stacked clusters in various redshift bins to derive colour-magnitude diagrams and galaxy luminosity functions (GLFs). For each galaxy with absolute magnitude brighter than -19.0 in the r band, we computed the disk and spheroid components by applying SExtractor, and by stacking clusters we determined how the disk-to-spheroid flux ratio varies with cluster redshift and mass. We also detected 3663 clusters in the redshift range 0.1513 and a few 10 14 solar masses. Furthermore, by stacking the cluster galaxies in various redshift bins, we find a clear red sequence in the (g'-r') versus r'more » colour-magnitude diagrams, and the GLFs are typical of clusters, though with a possible contamination from field galaxies. The morphological analysis of the cluster galaxies shows that the fraction of late-type to early-type galaxies shows an increase with redshift (particularly in high mass clusters) and a decrease with detection level, i.e. cluster mass. From the properties of the cluster galaxies, the majority of the candidate clusters detected here seem to be real clusters with typical cluster properties.« less
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [1] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9]
  1. Univ. Pierre et Marie Curie, Paris (France). Inst. of Astrophysics
  2. Marseille Observatory (France). Lab of Astrophysics
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Center for Particle Astrophysics
  4. Spanish National Research Council (CSIC), Granada (Spain). Inst. of Astrophysics
  5. Nice Observatory (OCA) (France)
  6. Univ. Pierre et Marie Curie, Paris (France). Inst. of Astrophysics; Observatory of Paris, Meduon (France); Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy
  7. Univ. Pierre et Marie Curie, Paris (France). Inst. of Astrophysics; Ecole Normale Superior Paris, Cachan (France)
  8. National Research Inst. of Astronomy and Geophysics (NRIAG), Cairo (Egypt)
  9. Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy
Publication Date:
Report Number(s):
arXiv:1504.00452; FERMILAB-PUB-15-675-AE
Journal ID: ISSN 0004-6361; 1357576; TRN: US1702111
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 578; Journal ID: ISSN 0004-6361
EDP Sciences
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; galaxies: clusters: general; galaxies: luminosity function; mass function; galaxies: fundamental parameters
OSTI Identifier: