The MAGPI Survey: The kinematic morphology–density relation (or lack thereof) and the Hubble sequence at z ∼ 0.3

Abstract This work presents visual morphological and dynamical classifications for 637 spatially resolved galaxies, most of which are at intermediate redshift ( $z\sim0.3$ ), in the Middle-Ages Galaxy Properties with Integral field spectroscopy (MAGPI) Survey. For each galaxy, we obtain a minimum of 11 independent visual classifications by knowledgeable classifiers. We use an extension of the standard Dawid-Skene bayesian model introducing classifier-specific confidence parameters and galaxy-specific difficulty parameters to quantify classifier confidence and infer reliable statistical confidence estimates. Selecting sub-samples of 86 bright ( $r\lt20$ mag) high-confidence ( $\gt0.98$ ) morphological classifications at redshifts ( $0.2 \le z \le0.4$ ), we confirm the full range of morphological types is represented in MAGPI as intended in the survey design. Similarly, with a sub-sample of 82 bright high-confidence stellar kinematic classifications, we find that the rotating and non-rotating galaxies seen at low redshift are already in place at intermediate redshifts. We do not find evidence that the kinematic morphology–density relation seen at $z\sim0$ is established at $z\sim0.3$ . We suggest that galaxies without obvious stellar rotation are dynamically pre-processed sometime before $z\sim0.3$ within lower mass groups before joining denser environments.

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Journal
Publications of the Astronomical Society of Australia
Published
2025-01-01
DOI
https://doi.org/10.1017/pasa.2025.19
Primary Topic
Astronomy and Astrophysical Research
Type
article
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article

The MAGPI Survey: The kinematic morphology–density relation (or lack thereof) and the Hubble sequence at z ∼ 0.3

Thomas Venville, Francesco D’Eugenio, E. Müller, R. S. Bagge et al.
Publications of the Astronomical Society of Australia
Astronomy and Astrophysical Research
article

The MAGPI Survey: The kinematic morphology–density relation (or lack thereof) and the Hubble sequence at z ∼ 0.3

Thomas Venville, Francesco D’Eugenio, E. Müller, R. S. Bagge, Alina Boecker, Qianhui Chen, Caroline Foster, Lucas M. Valenzuela, Rhea–Silvia Remus, Sarah Brough, Anshu Gupta, Sabine Thater, K. E. Harborne, Anna Ferré-Mateu, J. Trevor Mendel, Jesse van de Sande, Claudia del P. Lagos, Caro Derkenne, Mark W. Donoghoe, S. M. Croom, Eda Gjergo, Sabine Bellstedt, Sam P Vaughan, Stefania Barsanti, Giulia Santucci, Andrew Battisti, Emily Wisnioski, Hye-Jin Park
article en

Abstract

Abstract This work presents visual morphological and dynamical classifications for 637 spatially resolved galaxies, most of which are at intermediate redshift ( $z\sim0.3$ ), in the Middle-Ages Galaxy Properties with Integral field spectroscopy (MAGPI) Survey. For each galaxy, we obtain a minimum of 11 independent visual classifications by knowledgeable classifiers. We use an extension of the standard Dawid-Skene bayesian model introducing classifier-specific confidence parameters and galaxy-specific difficulty parameters to quantify classifier confidence and infer reliable statistical confidence estimates. Selecting sub-samples of 86 bright ( $r\lt20$ mag) high-confidence ( $\gt0.98$ ) morphological classifications at redshifts ( $0.2 \le z \le0.4$ ), we confirm the full range of morphological types is represented in MAGPI as intended in the survey design. Similarly, with a sub-sample of 82 bright high-confidence stellar kinematic classifications, we find that the rotating and non-rotating galaxies seen at low redshift are already in place at intermediate redshifts. We do not find evidence that the kinematic morphology–density relation seen at $z\sim0$ is established at $z\sim0.3$ . We suggest that galaxies without obvious stellar rotation are dynamically pre-processed sometime before $z\sim0.3$ within lower mass groups before joining denser environments.

Publications of the Astronomical Society of AustraliaVol. 42
Australian National University (AU), The University of Sydney (AU), University of Vienna (AT), Universidad de La Laguna (ES), The University of Western Australia (AU), Curtin University (AU), University of Cambridge (GB), UNSW Sydney (AU), Instituto de Astrofísica de Canarias (ES), ARC Centre of Excellence for All-sky Astrophysics (AU), International Centre for Radio Astronomy Research (AU), Ludwig-Maximilians-Universität München (DE), Nanjing University (CN), Macquarie University (AU)
Openalex Percentile: Top 94%
Astronomy and Astrophysical Research
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