The MAGPI Survey: impact of environment on the total internal mass distribution of galaxies in the last 5 Gyr

Caro Derkenne, Richard M. McDermid, Adriano Poci, J. Trevor Mendel, Francesco D'Eugenio, Seyoung Jeon, Rhea-Silvia Remus, Sabine Bellstedt, Andrew J. Battisti, Joss Bland-Hawthorn, Anna Ferré-Mateu, Caroline Foster, K. E. Harborne, Claudia D. P. Lagos, Yingjie Peng, Piyush Sharda, Gauri Sharma, Sarah Sweet, Kim-Vy H. Tran, Lucas M. ValenzuelaSam Vaughan, Emily Wisnioski, Sukyoung K. Yi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We investigate the impact of environment on the internal mass distribution of galaxies using the Middle Ages Galaxy Properties with Integral field spectroscopy (MAGPI) survey. We use 2D resolved stellar kinematics to construct Jeans dynamical models for galaxies at mean redshift z ~ 0.3, corresponding to a lookback time of 3-4 Gyr. The internal mass distribution for each galaxy is parametrized by the combined mass density slope γ (baryons + dark matter), which is the logarithmic change of density with radius. We use a MAGPI sample of 28 galaxies from low-to-mid density environments and compare to density slopes derived from galaxies in the high density Frontier Fields clusters in the redshift range 0.29 < z < 0.55, corresponding to a lookback time of ~5 Gyr. We find a median density slope of γ = -2.22 ± 0.05 for the MAGPI sample, which is significantly steeper than the Frontier Fields median slope (γ = -2.00 ± 0.04), implying the cluster galaxies are less centrally concentrated in their mass distribution than MAGPI galaxies. We also compare to the distribution of density slopes from galaxies in ATLAS3D at z ~ 0, because the sample probes a similar environmental range as MAGPI. The ATLAS3D median total slope is γ = -2.25 ± 0.02, consistent with the MAGPI median. Our results indicate environment plays a role in the internal mass distribution of galaxies, with no evolution of the slope in the last 3-4 Gyr. These results are in agreement with the predictions of cosmological simulations....
Original languageEnglish
Pages (from-to)3602-3626
Number of pages25
JournalMonthly Notices of the Royal Astronomical Society
Volume522
Issue number3
DOIs
Publication statusPublished - Jul 2023

Keywords

  • galaxies: evolution
  • galaxies: kinematics and dynamics

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