Year: 2022
Type: article
Abstract: ABSTRACT 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.
Authors: David J Lagattuta, Johan Richard, Franz Erik Bauer, Catherine Cerny, Adélaïde 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 Faisst, Marceau Limousin, Richard Massey, Mauro Sereno, Keren Sharon, John R Weaver
Institutions: Durham University, Lyon 1 Université, Centre National de la Recherche Scientifique, Centre de Recherche Astrophysique de Lyon, Space Science Institute, Pontificia Universidad Católica de Chile, Millennium Institute of Astrophysics, Universidad Andrés Bello, University of KwaZulu-Natal, Space Telescope Science Institute, University of Milan, California Institute of Technology, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics, Ben-Gurion University of the Negev, University of Birmingham, Jet Propulsion Laboratory, Princeton University, Infrared Processing and Analysis Center, Aix-Marseille Université, University of Michigan, University of Copenhagen
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,858
Funders: National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, UK Research and Innovation, American Sheep Industry Association, European Commission, United States-Israel Binational Science Foundation, Agenzia Spaziale Italiana, Istituto Nazionale di Astrofisica, Agencia Nacional de Investigación y Desarrollo, Jet Propulsion Laboratory, Institut sur la Nutrition et les Aliments Fonctionnels, Science and Technology Facilities Council
Awards: G1073154079, G1279511343, G1324578133, G1445822837, G1492468017, G1639075860, G1805294933, G2180937516, G2428672771, G261650857, G2918004267, G300722360, G3612853378, AN UNPRECEDENTED CENSUS OF BLACK HOLE ACTIVITY IN THE LSST ERA, G5590266513, CENTER FOR ASTROPHYSICS AND ASSOCIATED TECHNOLOGIES, G5633881658, G57481727, G5834573078, G60635070, G629320885, G6396559207, G6921772285, THE SHARPEST VIEW OF SUPERMASSIVE BLACK HOLE GROWTH AND STAR FORMATION IN THE NUCLEAR REGION OF MAJOR GALAXY MERGERS, NSF-BSF: Galaxies in the Reionization Era, MAss RAtio evolution in Clusters between HAlos and Sub-halos, G8067020961, G8159129473, Astronomy at Durham 2020-2023, G8380842850, G8533328913, G8552695075, CENTRO DE ASTROFISICA Y TECNOLOGIAS AFINES (CATA)
OpenAlex ID: W4214538107