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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2017

Weak lensing magnification of SpARCS galaxy clusters

A. Tudorica
  • Fonction : Auteur
H. Hildebrandt
  • Fonction : Auteur
M. Tewes
  • Fonction : Auteur
H. Hoekstra
C.B. Morrison
  • Fonction : Auteur
A. Muzzin
  • Fonction : Auteur
G. Wilson
  • Fonction : Auteur
H.K.C. Yee
  • Fonction : Auteur
C. Lidman
  • Fonction : Auteur
A. Hicks
  • Fonction : Auteur
J. Nantais
  • Fonction : Auteur
T. Erben
  • Fonction : Auteur
R. Demarco

Résumé

Context. Measuring and calibrating relations between cluster observables is critical for resource-limited studies. The mass–richness relation of clusters offers an observationally inexpensive way of estimating masses. Its calibration is essential for cluster and cosmological studies, especially for high-redshift clusters. Weak gravitational lensing magnification is a promising and complementary method to shear studies, that can be applied at higher redshifts.Aims. We aim to employ the weak lensing magnification method to calibrate the mass–richness relation up to a redshift of 1.4. We used the Spitzer Adaptation of the Red-Sequence Cluster Survey (SpARCS) galaxy cluster candidates (0.2 < z < 1.4) and optical data from the Canada France Hawaii Telescope (CFHT) to test whether magnification can be effectively used to constrain the mass of high-redshift clusters.Methods. Lyman-break galaxies (LBGs) selected using the u-band dropout technique and their colours were used as a background sample of sources. LBG positions were cross-correlated with the centres of the sample of SpARCS clusters to estimate the magnification signal, which was optimally-weighted using an externally-calibrated LBG luminosity function. The signal was measured for cluster sub-samples, binned in both redshift and richness.Results. We measured the cross-correlation between the positions of galaxy cluster candidates and LBGs and detected a weak lensing magnification signal for all bins at a detection significance of 2.6–5.5σ. In particular, the significance of the measurement for clusters with z> 1.0 is 4.1σ; for the entire cluster sample we obtained an average M200 of 1.28 -0.21+0.23 × 1014 M⊙. Conclusions. Our measurements demonstrated the feasibility of using weak lensing magnification as a viable tool for determining the average halo masses for samples of high redshift galaxy clusters. The results also established the success of using galaxy over-densities to select massive clusters at z > 1. Additional studies are necessary for further modelling of the various systematic effects we discussed.Key words: gravitational lensing: weak / galaxies: clusters: general / galaxies: clusters: individual: SpARCS
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Dates et versions

hal-01669437 , version 1 (13-10-2020)

Identifiants

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A. Tudorica, H. Hildebrandt, M. Tewes, H. Hoekstra, C.B. Morrison, et al.. Weak lensing magnification of SpARCS galaxy clusters. Astronomy and Astrophysics - A&A, 2017, 608, pp.A141. ⟨10.1051/0004-6361/201731267⟩. ⟨hal-01669437⟩
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