The next generation virgo cluster survey. XX. Redgold background galaxy cluster detections

Journal Article · Tue Sep 20 04:00:00 EDT 2016 · Astrophysical Journal

DOI:https://doi.org/10.3847/0004-637X/829/1/44· OSTI ID:22868659

Licitra, Rossella; Mei, Simona; Raichoor, Anand; Cuillandre, Jean-Charles; Parroni, Carolina ^[1]; Erben, Thomas; Hildebrandt, Hendrik ^[2]; Muñoz, Roberto P.; Puzia, Thomas H. ^[3]; Waerbeke, Ludovic Van ^[4]; Côté, Patrick; Ferrarese, Laura; Gwyn, Stephen D. J. ^[5]; Duc, Pierre-Alain ^[6]; Lançon, Ariane ^[7]

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1. GEPI, Observatoire de Paris, PSL Research University, CNRS, University of Paris Diderot, 61, Avenue de l’Observatoire F-75014, Paris (France)
2. Argelander-Institut für Astronomie, University of Bonn, Auf dem Hügel 71, D-53121 Bonn (Germany)
3. Institute of Astrophysics, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago (Chile)
4. Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 (Canada)
5. Herzberg Institute of Astrophysics, National Research Council of Canada, Victoria, BC V9E 2E7 (Canada)
6. CEA/IRFU/SAp, Laboratoire AIM Paris-Saclay, CNRS/INSU, Université Paris Diderot, PSL Research University, F-91191 Gif-sur-Yvette Cedex (France)
7. Observatoire astronomique de Strasbourg, Université de Strasbourg, CNRS, UMR 7550, 11 rue de l’Université, F-67000 Strasbourg (France)

We build a background cluster candidate catalog from the Next Generation Virgo Cluster Survey (NGVS) using our detection algorithm RedGOLD. The NGVS covers 104 deg{sup 2} of the Virgo cluster in the u{sup ∗},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 deg{sup 2}), and the other using four bandpasses (u{sup ∗},g,i,z) for the entire NGVS area. Based on our previous Canada–France–Hawaii Telescope Legacy Survey W1 studies, we estimate that both of our catalogs are ∼100% (∼70%) complete and ∼80% pure, at z ≤ 0.6 (z ≲ 1), for galaxy clusters with masses of M ≳ 10{sup 14} M {sub ⊙}. We show that when using four bandpasses, though 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 {sub 500} > 1.4 × 10{sup 14} M {sub ⊙} and 0.08 < z < 0.5. Because of our different cluster richness limits and the NGVS depth, our catalogs reach lower masses than the published redMaPPer cluster catalog over the area, and we recover ∼90%–100% of its detections.

• OSTI ID: 22868659
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 829; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
DETECTION
GALAXIES
GALAXY CLUSTERS
MASS
RED SHIFT
TELESCOPES
X RADIATION