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Title: The Next Generation Virgo Cluster Survey. XX. RedGOLD Background 
       Galaxy Cluster Detections 
Authors: Licitra R., Mei S., Raichoor A., Erben T., Hildebrandt H., Munoz R.P.,
         Van Waerbeke L., Cote P., Cuillandre J.-C., Duc P.-A., Ferrarese L.,
         Gwyn S.D.J., Huertas-Company M., Lancon A., Puzia T.H. 
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Description of contents: NGVS RedGOLD cluster candidate catalog as FITS files,
including:

NGVS_Licitra_4band.fits = NGVS RedGOLD cluster candidate catalog for the 
                          whole NGVS area, using only four optical bands.
NGVS_Licitra_5band.fits = NGVS RedGOLD cluster candidate catalog for the ∼20 
                          square degree region with deep r–band observations.

The columns in these catalogs correspond to 
  
    1. the J2000 right ascension, RA
    2. the J2000 declination, DEC
    3. the photometric cluster redshift, PHOTZ
    4. the bootstrap statistical error in photometric redshift, ePHOTOZ
    5. the average spectroscopic redshift, when available, SPECZ 
    6. the detection significance σdet, SDET
    7. the cluster richness λ, RICH
    8. the bootstrap statistical uncertainty on cluster richness λerr, eRICH


System requirements: These FITS catalog files do not require any specific
    system requirements.

Additional comments: We build a background cluster candidate catalog from the 
    Next Generation Virgo Cluster Survey, using our detection algorithm
    RedGOLD. The NGVS covers 104 deg2 of the Virgo cluster in the u∗, g,
    r, i, z–bandpasses to a depth of g ∼ 25.7 mag (5σ). Part of the
    survey was not covered or has shallow observations in the r–band. We
    build two cluster catalogs: one using all bandpasses, for the fields
    with deep r–band observations (∼ 20 deg2), and the other using four
    bandpasses (u∗, g, i, z) for the entire NGVS area. Based on our
    previous CFHT-LS W1 studies, we estimate that both our catalogs are
    ∼ 100%(∼ 70%) complete and ∼ 80% pure, at z ≤ 0.6(z~1), for galaxy
    clusters with mass M>10^14 M⊙. We show that when using four
    bandpasses, although the photometric redshift accuracy is lower,
    RedGOLD detects massive galaxy clusters up to z ∼ 1 with
    completeness and purity similar to the five–band case. This is
    achieved when taking into account the bias in the richness
    estimation, which is ∼ 40% lower at 0.5 ≤ z < 0.6 and ∼ 20% higher
    at 0.6 < z < 0.8, with respect to the five–band case. RedGOLD
    recovers all the X–ray clusters in the area with mass M_500 > 1.4 ×
    10^14M⊙ and 0.08 < z < 0.5.
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