TY - JOUR

T1 - The Fundamental Plane in the LEGA-C Survey

T2 - unraveling the $M/L$ variations of massive star-forming and quiescent galaxies at $z\sim0.8$

AU - Graaff, Anna de

AU - Bezanson, Rachel

AU - Franx, Marijn

AU - Wel, Arjen van der

AU - Holden, Bradford

AU - Sande, Jesse van de

AU - Bell, Eric F.

AU - D'Eugenio, Francesco

AU - Maseda, Michael V.

AU - Muzzin, Adam

AU - Sobral, David

AU - Straatman, Caroline M. S.

AU - Wu, Po-Feng

N1 - This is an author-created, un-copyedited version of an article accepted for publication/published in the Astrophysical journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.3847/1538-4357/abf1e7

PY - 2021/6/1

Y1 - 2021/6/1

N2 - 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.

AB - 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.

KW - Galaxy evolution

KW - Galaxy structure

KW - Galaxy kinematics

KW - Galaxy dynamics

U2 - 10.3847/1538-4357/abf1e7

DO - 10.3847/1538-4357/abf1e7

M3 - Journal article

VL - 913

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 103

ER -