A Caltech Library Service

Hubble Frontier Field free-form mass mapping of the massive multiple-merging cluster MACSJ0717.5+3745

Diego, Jose M. and Broadhurst, Tom and Zitrin, Adi and Lam, Daniel and Lim, Jeremy and Ford, Holland C. and Zheng, Wei (2015) Hubble Frontier Field free-form mass mapping of the massive multiple-merging cluster MACSJ0717.5+3745. Monthly Notices of the Royal Astronomical Society, 451 (4). pp. 3920-3932. ISSN 0035-8711.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We examine the latest data on the cluster MACSJ0717.5+3745 from the Hubble Frontier Fields campaign. The critically lensed area is the largest known of any lens and very irregular making it a challenge for parametric modelling. Using our free-form method we obtain an accurate solution, identify here many new sets of multiple images, doubling the number of constraints and improving the reconstruction of the dark matter distribution. Our reconstructed mass map shows several distinct central substructures with shallow density profiles, clarifying earlier work and defining well the relation between the dark matter distribution and the luminous and X-ray peaks within the critically lensed region. Using our free-form method, we are able to meaningfully subtract the mass contribution from cluster members to the deflection field to trace the smoothly distributed cluster dark matter distribution. We find four distinct concentrations, three of which are coincident with the luminous matter. The fourth peak has a significant offset from both the closest luminous and X-ray peaks. These findings, together with dynamical data from the motions of galaxies and gas will be important for uncovering the potentially important implications of this extremely massive and intriguing system.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Diego, Jose M.0000-0001-9065-3926
Zitrin, Adi0000-0002-0350-4488
Lam, Daniel0000-0002-6536-5575
Additional Information:© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 May 20. Received 2015 April 23. In original form 2014 November 11. First published online June 29, 2015. This work is based on observations made with the NASA/ESA HST and operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-2655. The authors would like to thank the HFF team (lead by Jennifer Lotz and Matt Mountain) for making the data for this work available to the community. We thank The Frontier Fields Science Data Products Team (lead Anton M. Koekemoer) for gathering and compiling the HFF data base for this project. The scientific results reported in this article are based in part on data obtained from the Chandra Data Archive.6,7,8 We would like to thank Harald Ebeling for making the code ASMOOTH (Ebeling et al. 2006) available. TJB thanks the University of Hong Kong for generous hospitality. JMD acknowledges support of the consolider project CSD2010-00064 and AYA2012-39475-C02-01 funded by the Ministerio de Economia y Competitividad. AZ was provided by NASA through Hubble Fellowship grant #HST-HF2-51334.001-A awarded by STScI. The authors thank Francisco Carrera, Nanda Rea and Marceau Limousin for very useful comments. We would also like to thank the anonymous referee for the suggestions that helped improve this paper.
Funding AgencyGrant Number
NASANAS 5-26555
Ministerio de Economía y Competitividad (MINECO)CSD2010-00064
Ministerio de Economía y Competitividad (MINECO)AYA2012-39475-C02-01
NASA Hubble FellowshipHST-HF2-51334.001-A
Subject Keywords:galaxies: clusters: general – dark matter
Issue or Number:4
Record Number:CaltechAUTHORS:20151013-160116773
Persistent URL:
Official Citation:Jose M. Diego, Tom Broadhurst, Adi Zitrin, Daniel Lam, Jeremy Lim, Holland C. Ford, and Wei Zheng Hubble Frontier Field free-form mass mapping of the massive multiple-merging cluster MACSJ0717.5+3745 MNRAS (August 21, 2015) Vol. 451 3920-3932 doi:10.1093/mnras/stv1168 First published online June 29, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61091
Deposited By: Tony Diaz
Deposited On:14 Oct 2015 13:58
Last Modified:09 Mar 2020 13:18

Repository Staff Only: item control page