TY - JOUR

T1 - Pilot-WINGS

T2 - An extended MUSE view of the structure of Abell 370

AU - Lagattuta, David J.

AU - Richard, Johan

AU - Bauer, Franz Erik

AU - Cerny, Catherine

AU - Claeyssens, Adelaide

AU - Guaita, Lucia

AU - Jauzac, Mathilde

AU - Jeanneau, Alexandre

AU - Koekemoer, Anton M.

AU - Mahler, Guillaume

AU - Prieto Lyon, Gonzalo

AU - Acebron, Ana

AU - Meneghetti, Massimo

AU - Niemiec, Anna

AU - Zitrin, Adi

AU - Bianconi, Matteo

AU - Connor, Thomas

AU - Cen, Renyue

AU - Edge, Alastair

AU - Faisst, Andreas L.

AU - Limousin, Marceau

AU - Massey, Richard

AU - Sereno, Mauro

AU - Sharon, Keren

AU - Weaver, John R.

PY - 2022/6/3

Y1 - 2022/6/3

N2 - 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 arcmin(2), 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.

AB - 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 arcmin(2), 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.

KW - gravitational lensing: strong

KW - techniques: imaging spectroscopy

KW - galaxies: clusters: individual: Abell 370

KW - galaxies: kinematics and dynamics

KW - dark matter

KW - large-scale structure of Universe

KW - MASSIVE GALAXY CLUSTERS

KW - ACTIVE GALACTIC NUCLEI

KW - DARK-MATTER

KW - MACS J0417.5-1154

KW - SCALING RELATIONS

KW - FRONTIER FIELD

KW - X-RAY

KW - HUBBLE

KW - COSMOLOGY

KW - PROFILE

U2 - 10.1093/mnras/stac418

DO - 10.1093/mnras/stac418

M3 - Journal article

VL - 514

SP - 497

EP - 517

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 1

ER -