The Epoch of Disk Settling: z~1 to Now
Susan A. Kassin, Benjamin J. Weiner, S. M. Faber, Jonathan P. Gardner,, C. N. A. Willmer, Alison L. Coil, Michael C. Cooper, Julien Devriendt, Aaron, A. Dutton, Puragra Guhathakurta, David C. Koo, A. J. Metevier, Kai G. Noeske,, Joel R. Primack

TL;DR
This study shows that blue galaxies have become more rotation-dominated and less disordered from redshift 1.2 to the present, indicating a settling process into stable disk galaxies over the last 8 billion years.
Contribution
It provides new observational evidence of galaxy kinematic evolution over cosmic time using a large sample from the DEEP2 Survey.
Findings
Galaxies decrease in disordered motions over time.
Massive galaxies are more ordered than less massive ones.
No clear redshift trend in kinematics from literature data.
Abstract
We present evidence from a sample of 544 galaxies from the DEEP2 Survey for evolution of the internal kinematics of blue galaxies with stellar masses ranging 8.0 < log M* (M_Sun) < 10.7 over 0.2<z<1.2. DEEP2 provides galaxy spectra and Hubble imaging from which we measure emission-line kinematics and galaxy inclinations, respectively. Our large sample allows us to overcome scatter intrinsic to galaxy properties in order to examine trends in kinematics. We find that at a fixed stellar mass galaxies systematically decrease in disordered motions and increase in rotation velocity and potential well depth with time. Massive galaxies are the most well-ordered at all times examined, with higher rotation velocities and less disordered motions than less massive galaxies. We quantify disordered motions with an integrated gas velocity dispersion corrected for beam smearing (sigma_g). It is unlike…
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