TY - JOUR
T1 - The MAGPI survey
T2 - Orbital distributions, intrinsic shapes, and mass profiles for MAGPI-like eagle galaxies using Schwarzschild dynamical models
AU - Santucci, Giulia
AU - Lagos, Claudia Del P.
AU - Harborne, Katherine E.
AU - Derkenne, Caro
AU - Poci, Adriano
AU - Thater, Sabine
AU - McDermid, Richard M.
AU - Mendel, J. Trevor
AU - Wisnioski, Emily
AU - Croom, Scott M.
AU - Ferre-Mateu, Anna
AU - Muller, Eric G.M.
AU - Van De Sande, Jesse
AU - Sharma, Gauri
AU - Sweet, Sarah M.
AU - Tsukui, Takafumi
AU - Valenzuela, Lucas M.
AU - Van De Ven, Glenn
AU - Zafar, Tayyaba
N1 - Publisher Copyright:
© 2024 The Author(s).
PY - 2024/10/1
Y1 - 2024/10/1
N2 - 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.
AB - 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.
KW - galaxies: fundamental parameters
KW - galaxies: kinematics and dynamics
KW - galaxies: stellar content
UR - http://www.scopus.com/inward/record.url?scp=85204931223&partnerID=8YFLogxK
U2 - 10.1093/mnras/stae2114
DO - 10.1093/mnras/stae2114
M3 - Article
AN - SCOPUS:85204931223
SN - 0035-8711
VL - 534
SP - 502
EP - 522
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -