TY - JOUR
T1 - Precise weak lensing constraints from deep high-resolution K s images
T2 - VLT/HAWK-I analysis of the super-massive galaxy cluster RCS2 J 232727.7-020437 at z = 0.70
AU - Schrabback, Tim
AU - Schirmer, Mischa
AU - Van Der Burg, Remco F.J.
AU - Hoekstra, Henk
AU - Buddendiek, Axel
AU - Applegate, Douglas
AU - Bradač, Maruša
AU - Eifler, Tim
AU - Erben, Thomas
AU - Gladders, Michael D.
AU - Hernández-Martín, Beatriz
AU - Hildebrandt, Hendrik
AU - Hoag, Austin
AU - Klaes, Dominik
AU - Der Linden, Anja Von
AU - Marchesini, Danilo
AU - Muzzin, Adam
AU - Sharon, Keren
AU - Stefanon, Mauro
N1 - Funding Information:
the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme(s) 087.A-0933, at the Large Binocular Telescope (LBT), and with the NASA/ESA Hubble Space Telescope under GO programmes 13177 and 10846. This work also makes use of catalogues created by the 3D-HST Treasury Program (GO 12177 and 12328) and catalogues derived from the ESO UltraVISTA Programme 179.A-2005. We thank ESO staff for obtaining the excellent VLT/HAWK-I images and Paul Martini, David Atlee, Erica Hes-selbach, Jeff Blackburne, and Matthias Dietrich for conducting the LBT/LBC observations. We thank Patrick Simon for providing the codes employed in this work to reconstruct the cluster mass distribution and to generate Gaussian shear field realisations for the estimation of the impact of large-scale structure projections. We thank Peter Schneider for useful discussions and for providing comments on this manuscript. TS, DA, BH, and DK acknowledge support from the German Federal Ministry of Economics and Technology (BMWi) provided through DLR under projects 50 OR 1210, 50 OR 1308, 50 OR 1407, and 50 OR 1610. RFJvdB acknowledges support from the European Research Council under FP7 grant number 340519. TE is supported by the Deutsche Forschungsgemeinschaft in the framework of the TR33 “The Dark Universe”. HHi is supported by an Emmy Noether grant (No. Hi 1495/2-1) of the Deutsche Forschungsgemeinschaft. This work was supported in part by the Kavli Institute for Cosmological Physics at the University of Chicago through grant NSF PHY-1125897 and an endowment from the Kavli Foundation and its founder Fred Kavli. Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. HST is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. The LBT is an international collaboration among institutions in the United States, Italy and Germany. LBT Corporation partners are The University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota and University of Virginia. This research made use of APLpy, an open-source plotting package for Python (Robitaille & Bressert 2012).
Publisher Copyright:
© ESO 2018.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - We demonstrate that deep good-seeing VLT/HAWK-I Ks images complemented with g + z-band photometry can yield a sensitivity for weak lensing studies of massive galaxy clusters at redshifts 0.7 ≤ z ≤ 1.1, which is almost identical to the sensitivity of HST/ACS mosaics of single-orbit depth. Key reasons for this good performance are the excellent image quality frequently achievable for Ks imaging from the ground, a highly effective photometric selection of background galaxies, and a galaxy ellipticity dispersion that is noticeably lower than for optically observed high-redshift galaxy samples. Incorporating results from the 3D-HST and UltraVISTA surveys we also obtained a more accurate calibration of the source redshift distribution than previously achieved for similar optical weak lensing data sets. Here we studied the extremely massive galaxy cluster RCS2 J232727.7-020437 (z = 0.699), combining deep VLT/HAWK-I Ks images (point spread function with a 0.′′35 full width at half maximum) with LBT/LBC photometry. The resulting weak lensing mass reconstruction suggests that the cluster consists of a single overdensity, which is detected with a peak significance of 10.1σ. We constrained the cluster mass to M200c/(1015 M⊙) = 2.06-0.26+0.28(stat.) ± 0.12(sys.) assuming a spherical Navarro, Frenk & White model and simulation-based priors on the concentration, making it one of the most massive galaxy clusters known in the z ≥ 0.7 Universe. We also cross-checked the HAWK-I measurements through an analysis of overlapping HST/ACS images, yielding fully consistent estimates of the lensing signal.
AB - We demonstrate that deep good-seeing VLT/HAWK-I Ks images complemented with g + z-band photometry can yield a sensitivity for weak lensing studies of massive galaxy clusters at redshifts 0.7 ≤ z ≤ 1.1, which is almost identical to the sensitivity of HST/ACS mosaics of single-orbit depth. Key reasons for this good performance are the excellent image quality frequently achievable for Ks imaging from the ground, a highly effective photometric selection of background galaxies, and a galaxy ellipticity dispersion that is noticeably lower than for optically observed high-redshift galaxy samples. Incorporating results from the 3D-HST and UltraVISTA surveys we also obtained a more accurate calibration of the source redshift distribution than previously achieved for similar optical weak lensing data sets. Here we studied the extremely massive galaxy cluster RCS2 J232727.7-020437 (z = 0.699), combining deep VLT/HAWK-I Ks images (point spread function with a 0.′′35 full width at half maximum) with LBT/LBC photometry. The resulting weak lensing mass reconstruction suggests that the cluster consists of a single overdensity, which is detected with a peak significance of 10.1σ. We constrained the cluster mass to M200c/(1015 M⊙) = 2.06-0.26+0.28(stat.) ± 0.12(sys.) assuming a spherical Navarro, Frenk & White model and simulation-based priors on the concentration, making it one of the most massive galaxy clusters known in the z ≥ 0.7 Universe. We also cross-checked the HAWK-I measurements through an analysis of overlapping HST/ACS images, yielding fully consistent estimates of the lensing signal.
KW - Galaxies: clusters: individual: RCS2 J232727.7-020437
KW - Gravitational lensing: weak
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U2 - 10.1051/0004-6361/201731730
DO - 10.1051/0004-6361/201731730
M3 - Article
AN - SCOPUS:85043529369
VL - 610
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 0004-6361
M1 - A85
ER -