1. Stellar Dynamical Models for 797 z ∼ 0.8 Galaxies from LEGA-C
- Author
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Josha van Houdt, Arjen van der Wel, Rachel Bezanson, Marijn Franx, Francesco d’Eugenio, Ivana Barisic, Eric F. Bell, Anna Gallazzi, Anna de Graaff, Michael V. Maseda, Camilla Pacifici, Jesse van de Sande, David Sobral, Caroline Straatman, and Po-Feng Wu
- Subjects
SERSIC PROFILES ,Astrophysics - astrophysics of galaxies ,573, 591, 2171, 602, 622, 1671 ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,STAR-FORMATION ,0103 physical sciences ,DARK-MATTER ,INTEGRAL FIELD SPECTROSCOPY ,10. No inequality ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,010308 nuclear & particles physics ,Astronomy and Astrophysics ,ATLAS(3D) PROJECT ,Astrophysics - Astrophysics of Galaxies ,AXISYMMETRICAL GALAXIES ,SAURON PROJECT ,SLOW ROTATORS ,Physics and Astronomy ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,ANGULAR-MOMENTUM ,LIGHT RATIO - Abstract
We present spatially resolved stellar kinematics for 797 $z=0.6-1$ galaxies selected from the LEGA-C survey and construct axisymmetric Jeans models to quantify their dynamical mass and degree of rotational support. The survey is $K_s$-band selected, irrespective of color or morphological type, and allows for a first assessment of the stellar dynamical structure of the general $L^*$ galaxy population at large lookback time. Using light profiles from Hubble Space Telescope imaging as a tracer, our approach corrects for observational effects (seeing convolution and slit geometry), and uses well-informed priors on inclination, anisotropy and a non-luminous mass component. Tabulated data include total mass estimates in a series of spherical apertures (1, 5, and 10 kpc; 1$\times$ and 2$\times$\re), as well as rotational velocities, velocity dispersions and anisotropy. We show that almost all star-forming galaxies and $\sim$50\% of quiescent galaxies are rotation-dominated, with deprojected $V/\sigma\sim1-2$. Revealing the complexity in galaxy evolution, we find that the most massive star-forming galaxies are among the most rotation-dominated, and the most massive quiescent galaxies among the least rotation-dominated galaxies. These measurements set a new benchmark for studying galaxy evolution, using stellar dynamical structure for galaxies at large lookback time. Together with the additional information on stellar population properties from the LEGA-C spectra, the dynamical mass and $V/\sigma$ measurements presented here create new avenues for studying galaxy evolution at large lookback time., Comment: Accepted for publication in ApJ. Data table will be published with journal article and is now available upon request
- Published
- 2021