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Pilot-WINGS: An extended MUSE view of the structure of Abell 370

Lagattuta, David J and Richard, Johan and Bauer, Franz Erik and Cerny, Catherine and Claeyssens, Adélaïde and Guaita, Lucia and Jauzac, Mathilde and Jeanneau, Alexandre and Koekemoer, Anton M and Mahler, Guillaume and Prieto Lyon, Gonzalo and Acebron, Ana and Meneghetti, Massimo and Niemiec, Anna and Zitrin, Adi and Bianconi, Matteo and Connor, Thomas and Cen, Renyue and Edge, Alastair and Faisst, Andreas L and Limousin, Marceau and Massey, Richard and Sereno, Mauro and Sharon, Keren and Weaver, John R (2022) 'Pilot-WINGS: An extended MUSE view of the structure of Abell 370.', Monthly Notices of the Royal Astronomical Society, 514 (1). pp. 497-517.


We investigate the strong-lensing cluster Abell 370 (A370) using a wide Integral Field Unit (IFU) spectroscopic mosaic from the Multi-Unit Spectroscopic Explorer (MUSE). IFU spectroscopy provides significant insight into the structure and mass content of galaxy clusters, yet IFU-based cluster studies focus almost exclusively on the central Einstein-radius region. Covering over 14 arcmin2, the new MUSE mosaic extends significantly beyond the A370 Einstein radius, providing, for the first time, a detailed look at the cluster outskirts. Combining these data with wide-field, multi-band Hubble Space Telescope (HST) imaging from the BUFFALO project, we analyse the distribution of objects within the cluster and along the line of sight. Identifying 416 cluster galaxies, we use kinematics to trace the radial mass profile of the halo, providing a mass estimate independent from the lens model. We also measure radially averaged properties of the cluster members, tracking their evolution as a function of infall. Thanks to the high spatial resolution of our data, we identify six cluster members acting as galaxy–galaxy lenses, which constrain localized mass distributions beyond the Einstein radius. Finally, taking advantage of MUSE’s 3D capabilities, we detect and analyse multiple spatially extended overdensities outside of the cluster that influence lensing-derived halo mass estimates. We stress that much of this work is only possible thanks to the robust, extended IFU coverage, highlighting its importance even in less optically dense cluster regions. Overall, this work showcases the power of combining HST + MUSE, and serves as the initial step towards a larger and wider program targeting several clusters.

Item Type:Article
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Publisher statement:This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society
Date accepted:07 February 2022
Date deposited:11 July 2022
Date of first online publication:01 June 2022
Date first made open access:11 July 2022

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