Home > Research > Publications & Outputs > The Fundamental Plane in the LEGA-C Survey

Associated organisational unit

Electronic data

  • 2103.12753v1

    Rights statement: 12m

    Accepted author manuscript, 1.79 MB, PDF document

    Embargo ends: 1/01/50

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License


View graph of relations

The Fundamental Plane in the LEGA-C Survey: unraveling the $M/L$ variations of massive star-forming and quiescent galaxies at $z\sim0.8$

Research output: Contribution to journalJournal articlepeer-review

  • Anna de Graaff
  • Rachel Bezanson
  • Marijn Franx
  • Arjen van der Wel
  • Bradford Holden
  • Jesse van de Sande
  • Eric F. Bell
  • Francesco D'Eugenio
  • Michael V. Maseda
  • Adam Muzzin
  • David Sobral
  • Caroline M. S. Straatman
  • Po-Feng Wu
<mark>Journal publication date</mark>23/03/2021
<mark>Journal</mark>The Astrophysical Journal
Publication StatusAccepted/In press
<mark>Original language</mark>English


We explore the connection between the kinematics, structures and stellar populations of massive galaxies at $0.610.5$) galaxies that span a wide range in morphology, star formation activity and environment, and therefore is representative of the massive galaxy population at $z\sim0.8$. We find that quiescent and star-forming galaxies occupy the parameter space of the $g$-band FP differently and thus have different distributions in the dynamical mass-to-light ratio ($M_{\rm dyn}/L_g$), largely owing to differences in the stellar age and recent star formation history, and, to a lesser extent, the effects of dust attenuation. In contrast, we show that both star-forming and quiescent galaxies lie on the same mass FP at $z\sim 0.8$, with a comparable level of intrinsic scatter about the plane. We examine the variation in $M_{\rm dyn}/M_*$ through the thickness of the mass FP, finding no significant residual correlations with stellar population properties, S\'ersic index, or galaxy overdensity. Our results suggest that, at fixed size and velocity dispersion, the variations in $M_{\rm dyn}/L_g$ of massive galaxies reflect an approximately equal contribution of variations in $M_*/L_g$, and variations in the dark matter fraction or initial mass function.

Bibliographic note

32 pages, 19 figures (including appendices); accepted for publication in ApJ