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Published May 2017 | Published + Submitted
Journal Article Open

Precise strong lensing mass profile of the CLASH galaxy cluster MACS 2129

Abstract

We present a detailed strong lensing (SL) mass reconstruction of the core of the galaxy cluster MACS J2129.4−0741 (z_(cl) = 0.589) obtained by combining high-resolution Hubble Space Telescope photometry from the CLASH (Cluster Lensing And Supernovae survey with Hubble) survey with new spectroscopic observations from the CLASH-VLT (Very Large Telescope) survey. A background bright red passive galaxy at z_(sp) = 1.36, sextuply lensed in the cluster core, has four radial lensed images located over the three central cluster members. Further 19 background lensed galaxies are spectroscopically confirmed by our VLT survey, including 3 additional multiple systems. A total of 31 multiple images are used in the lensing analysis. This allows us to trace with high precision the total mass profile of the cluster in its very inner region (R < 100 kpc). Our final lensing mass model reproduces the multiple images systems identified in the cluster core with high accuracy of 0.4 arcsec. This translates to a high-precision mass reconstruction of MACS 2129, which is constrained at a level of 2 per cent. The cluster has Einstein parameter Θ_E = (29 ± 4) arcsec and a projected total mass of M_(tot)(<Θ_E) = (1.35 ± 0.03) × 10^(14) M⊙ within such radius. Together with the cluster mass profile, we provide here also the complete spectroscopic data set for the cluster members and lensed images measured with VLT/Visible Multi-Object Spectrograph within the CLASH-VLT survey.

Additional Information

© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 January 4. Received 2017 January 4; in original form 2016 May 27. Published: 07 January 2017. This work is supported by the Transregional Collaborative Research Centre TRR 33 – The Dark Universe and the DFG cluster of excellence 'Origin and Structure of the Universe'. The CLASH Multi-Cycle Treasury Program (GO-12065) is based on observations made with the NASA/ESA Hubble Space Telescope. The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS5-26555. SHS gratefully acknowledges support from the Max Planck Society through the Max Planck Research Group. PR and AMe acknowledge support from PRIN-INAF 2014 1.05.01.94.02 (PI: M. Nonino). PR acknowledges the hospitality and support of the visitor programme of the DFG cluster of excellence 'Origin and Structure of the Universe'. CG acknowledges support by VILLUM FONDEN Young Investigator Programme through grant no. 10123.

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Created:
August 19, 2023
Modified:
October 26, 2023