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

Lagattuta, David J; Richard, Johan; Bauer, Franz Erik; Cerny, Catherine; Claeyssens, Adélaïde; Guaita, Lucia; Jauzac, Mathilde; Jeanneau, Alexandre; Koekemoer, Anton M; Mahler, Guillaume; Prieto Lyon, Gonzalo; Acebron, Ana; Meneghetti, Massimo; Niemiec, Anna; Zitrin, Adi; Bianconi, Matteo; Connor, Thomas; Cen, Renyue; Edge, Alastair; Faisst, Andreas L; Limousin, Marceau; Massey, Richard; Sereno, Mauro; Sharon, Keren; Weaver, John R

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Johan Richard

Franz Erik Bauer

Adélaïde Claeyssens

Lucia Guaita

Alexandre Jeanneau

Anton M Koekemoer

Gonzalo Prieto Lyon

Ana Acebron

Massimo Meneghetti

Adi Zitrin

Matteo Bianconi

Thomas Connor

Renyue Cen

Andreas L Faisst

Marceau Limousin

Mauro Sereno

Keren Sharon

John R Weaver


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.


Lagattuta, D. J., Richard, J., Bauer, F. E., Cerny, C., Claeyssens, A., Guaita, L., …Weaver, J. R. (2022). Pilot-WINGS: An extended MUSE view of the structure of Abell 370. Monthly Notices of the Royal Astronomical Society, 514(1), 497-517.

Journal Article Type Article
Acceptance Date Feb 7, 2022
Online Publication Date Jun 1, 2022
Publication Date 2022-07
Deposit Date Jul 11, 2022
Publicly Available Date Jul 11, 2022
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 514
Issue 1
Pages 497-517


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Copyright 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

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