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The ALPINE-ALMA [C ii] Survey: kinematic diversity and rotation in massive star-forming galaxies at z ~ 4.4–5.9.
- Source :
- Monthly Notices of the Royal Astronomical Society; Nov2021, Vol. 507 Issue 3, p3540-3563, 24p
- Publication Year :
- 2021
-
Abstract
- 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 [C ii ] at Early times (ALPINE) survey observed a statistically significant sample of 118 star-forming main-sequence galaxies at z = 4.4–5.9 in [C ii ]158 |$\mu$| m emission, increasing the number of such observations by nearly 10×. 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 (<superscript>3D</superscript> barolo), a morphological classification (Gini-M<subscript>20</subscript>), and a set of disc identification criteria. Of the 75 [C ii ]-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 (|$M_*\gt 10^{9.5}\, \mathrm{M}_{\odot }$|). 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-M<subscript>20</subscript> of z > 4 rest-frame far-infrared and [C ii ] data for the first time, we find that our 1 arcsec ∼ 6 kpc 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 (∼50–250 km s<superscript>−1</superscript>) and a diversity of rotation curve shapes. [ABSTRACT FROM AUTHOR]
- Subjects :
- GALACTIC redshift
GALAXIES
SPATIAL resolution
ROTATIONAL motion
MORPHOLOGY
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 507
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 152652291
- Full Text :
- https://doi.org/10.1093/mnras/stab2226