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An atlas of MUSE observations towards twelve massive lensing clusters

Richard, Johan and Claeyssens, Adélaïde and Lagattuta, David and Guaita, Lucia and Bauer, Franz Erik and Pello, Roser and Carton, David and Bacon, Roland and Soucail, Geneviève and Lyon, Gonzalo Prieto and Kneib, Jean-Paul and Mahler, Guillaume and Clément, Benjamin and Mercier, Wilfried and Variu, Andrei and Tamone, Amélie and Ebeling, Harald and Schmidt, Kasper B. and Nanayakkara, Themiya and Maseda, Michael and Weilbacher, Peter M. and Bouché, Nicolas and Bouwens, Rychard J. and Wisotzki, Lutz and de la Vieuville, Geoffroy and Martinez, Johany and Patrício, Vera (2021) 'An atlas of MUSE observations towards twelve massive lensing clusters.', Astronomy & astrophysics., 646 . A83.


Context. Spectroscopic surveys of massive galaxy clusters reveal the properties of faint background galaxies thanks to the magnification provided by strong gravitational lensing. Aims. We present a systematic analysis of integral-field-spectroscopy observations of 12 massive clusters, conducted with the Multi Unit Spectroscopic Explorer (MUSE). All data were taken under very good seeing conditions (∼0″​​.6) in effective exposure times between two and 15 h per pointing, for a total of 125 h. Our observations cover a total solid angle of ∼23 arcmin2 in the direction of clusters, many of which were previously studied by the MAssive Clusters Survey, Frontier Fields (FFs), Grism Lens-Amplified Survey from Space and Cluster Lensing And Supernova survey with Hubble programmes. The achieved emission line detection limit at 5σ for a point source varies between (0.77–1.5) × 10−18 erg s−1 cm−2 at 7000 Å. Methods. We present our developed strategy to reduce these observational data, detect continuum sources and line emitters in the datacubes, and determine their redshifts. We constructed robust mass models for each cluster to further confirm our redshift measurements using strong-lensing constraints, and identified a total of 312 strongly lensed sources producing 939 multiple images. Results. The final redshift catalogues contain more than 3300 robust redshifts, of which 40% are for cluster members and ∼30% are for lensed Lyman-α emitters. Fourteen percent of all sources are line emitters that are not seen in the available HST images, even at the depth of the FFs (∼29 AB). We find that the magnification distribution of the lensed sources in the high-magnification regime (μ = 2–25) follows the theoretical expectation of N(z) ∝ μ−2. The quality of this dataset, number of lensed sources, and number of strong-lensing constraints enables detailed studies of the physical properties of both the lensing cluster and the background galaxies. The full data products from this work, including the datacubes, catalogues, extracted spectra, ancillary images, and mass models, are made available to the community.

Item Type:Article
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Publisher statement:© J. Richard et al. 2021 Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Date accepted:08 December 2020
Date deposited:23 June 2021
Date of first online publication:12 February 2021
Date first made open access:23 June 2021

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