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

Graaff, Anna de and Bezanson, Rachel and Franx, Marijn and Wel, Arjen van der and Holden, Bradford and Sande, Jesse van de and Bell, Eric F. and D'Eugenio, Francesco and Maseda, Michael V. and Muzzin, Adam and Sobral, David and Straatman, Caroline M. S. and Wu, Po-Feng (2021) The Fundamental Plane in the LEGA-C Survey : unraveling the $M/L$ variations of massive star-forming and quiescent galaxies at $z\sim0.8$. The Astrophysical Journal, 913 (2): 103. ISSN 0004-637X

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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.

Item Type:
Journal Article
Journal or Publication Title:
The Astrophysical Journal
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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
Uncontrolled Keywords:
?? galaxy evolutiongalaxy structuregalaxy kinematicsgalaxy dynamicsastronomy and astrophysicsspace and planetary science ??
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Deposited On:
13 Apr 2021 13:05
Last Modified:
29 Nov 2023 00:30