The MAGPI survey
- Author(s)
- Giulia Santucci, Claudia Del P. Lagos, Katherine E. Harborne, Caro Derkenne, Adriano Poci, Sabine Thater, Richard M. McDermid, J. Trevor Mendel, Emily Wisnioski, Scott M. Croom, Anna Ferre-Mateu, Eric G.M. Muller, Jesse Van De Sande, Gauri Sharma, Sarah M. Sweet, Takafumi Tsukui, Lucas M. Valenzuela, Glenn Van De Ven, Tayyaba Zafar
- Abstract
Schwarzschild dynamical models are now regularly employed in large surveys of galaxies in the local and distant Universe to derive information on galaxies' intrinsic properties such as their orbital structure and their (dark matter and stellar) mass distribution. Comparing the internal orbital structures and mass distributions of galaxies in the distant Universe with simulations is key to understanding what physical processes are responsible for shaping galaxy properties. However, it is first crucial to understand whether observationally derived properties are directly comparable with intrinsic ones in simulations. To assess this, we build Schwarzschild dynamical models for MUSE-like IFS (integral field spectroscopy) cubes (constructed to be like those obtained by the Middle Ages Galaxy Properties with Integral Field Spectroscopy, MAGPI survey) of 75 galaxies at 0.3 from the eagle simulations. We compare the true particle-derived properties with the galaxies' model-derived properties. In general, we find that the models can recover the true galaxy properties qualitatively well, with the exception of the enclosed dark matter, where we find a median offset of 48 per cent, which is due to the assumed Navarro-Frenk-White profile not being able to reproduce the dark matter distribution in the inner region of the galaxies. We then compare our model-derived properties with Schwarzschild models-derived properties of observed MAGPI galaxies and find good agreement between MAGPI and eagle: The majority of our galaxies (57 per cent) have non-oblate shapes within 1 effective radius. More triaxial galaxies show higher fractions of hot orbits in their inner regions and tend to be more radially anisotropic.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- University of Western Australia, ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), University of Oxford, Macquarie University, The University of Sydney, Institute of Astrophysics of the Canary Islands, University of La Laguna, University of New South Wales, Université de Strasbourg, University of the Western Cape (UWC), Scuola Internazionale Superiore di Studi Avanzati, University of Queensland, Universitäts-Sternwarte München, Ludwig-Maximilians-Universität München
- Journal
- Monthly Notices of the Royal Astronomical Society
- Volume
- 534
- Pages
- 502-522
- No. of pages
- 21
- ISSN
- 0035-8711
- DOI
- https://doi.org/10.1093/mnras/stae2114
- Publication date
- 10-2024
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/the-magpi-survey(c6ba7e51-7e9b-4a83-91f7-3cca1e3cf4d0).html