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

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

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)497-517
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - 1 Jul 2022


  • Dark matter
  • Galaxies: clusters: individual: Abell 370
  • Galaxies: kinematics and dynamics
  • Gravitational lensing: strong
  • Large-scale structure of Universe
  • Techniques: imaging spectroscopy

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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