Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/40870
Title: An excursion into the core of the cluster lens Abell 1689
Authors: GHOSH, Agniva
Adams, Dominic
Williams, Liliya L R
Alavi, Anahita
LIESENBORGS, Jori 
Scarlata, Claudia
Issue Date: 2023
Publisher: OXFORD UNIV PRESS
Source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 525 (2) , p. 2519 -2534
Abstract: Abell 1689 is a well studied cluster of galaxies and one of the largest gravitational lens systems ever observed. We have obtained a reconstruction of the cluster Abell 1689 using Grale, a free-form lens inversion method that relies exclusively on the multiple image data. Non-inclusion of any data related to cluster member galaxies ensures an unbiased measure of the mass distribution, which is the most notable feature of free-form methods like Grale. We used two different sets of multiple image systems from the available strong lensing data - one containing only the secure systems (107 images), and the other containing all available systems, only excluding some very non-secure systems (151 images). For the very well-constrained central $\sim$100 kpc region of the cluster we made detailed comparison of the Grale reconstructed lensing mass and stellar mass retrieved by the Spectral Energy Distribution (SED) fitting software FAST++. We found a light-unaccompanied mass peak in this region, whose existence, while tentative, is favored by the distribution of nearby images that are local maxima in the Fermat potential. However, further tests, using different methodologies are needed to confirm the reality of this feature. If it shown to be real, this light-unaccompanied mass peak is consistent with dark matter self-interaction cross-section $\sigma \lesssim 1$cm$^2$/g, while being in tension with larger cross-sections.
Keywords: gravitational lensing;strong;galaxies;clusters;individual;Abell 1689
Document URI: http://hdl.handle.net/1942/40870
Link to publication/dataset: https://academic.oup.com/mnras/article/525/2/2519/7251505?guestAccessKey=6f88c3b6-ca9c-4ceb-b554-37a6295a0838&login=true&utm_source=authortollfreelink&utm_campaign=mnras&utm_medium=email
ISSN: 0035-8711
e-ISSN: 1365-2966
DOI: 10.1093/mnras/stad2418
ISI #: 001058184100002
Rights: 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. Free access
Category: A1
Type: Journal Contribution
Appears in Collections:Research publications

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