The ALPINE-ALMA [CII] Survey: Kinematic Diversity & Rotation in Massive
  Star Forming Galaxies at z~4.4-5.9
  While the kinematics of galaxies up to z~3 have been characterized in detail,
only a handful of galaxies at high redshift (z>4) have been examined in such a
way. The Atacama Large Millimeter/submillimeter Array (ALMA) Large Program to
INvestigate [CII] at Early times (ALPINE) survey observed a statistically
significant sample of 118 star-forming main sequence galaxies at z=4.4-5.9 in
[CII]158um emission, increasing the number of such observations by nearly 10x.
A preliminary qualitative classification of these sources revealed a diversity
of kinematic types (i.e., rotators, mergers, and dispersion-dominated systems).
In this work, we supplement the initial classification by applying quantitative
analyses to the ALPINE data: a tilted ring model (TRM) fitting code (3DBarolo),
a morphological classification (Gini-M20), and a set of disk identification
criteria. Of the 75 [CII]-detected ALPINE galaxies, 29 are detected at
sufficient significance and spatial resolution to allow for TRM fitting and the
derivation of morphological and kinematic parameters. These 29 sources
constitute a high-mass subset of the ALPINE sample (M_*>10^9.5Msol). We
robustly classify 14 of these sources (six rotators, five mergers, and three
dispersion-dominated systems); the remaining sources showing complex behaviour.
By exploring the G-M20 of z>4 rest-frame FIR and [CII] data for the first time,
we find that our 1"~6kpc resolution data alone are insufficient to separate
galaxy types. We compare the rotation curves and dynamical mass profiles of the
six ALPINE rotators to the two previously detected z~4-6 unlensed main sequence
rotators, finding high rotational velocities (~50-250km/s) and a diversity of
rotation curve shapes.
