期刊
ASTRONOMY & ASTROPHYSICS
卷 654, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202040225
关键词
galaxies: high-redshift; galaxies: evolution; galaxies: kinematics and dynamics; galaxies: structure
资金
- European Southern Observatory under ESO programs [097.A-0138(A), 097.A-0144(A), 0100.A-0089(A)]
- ANR 3DGasFlows [ANR-17-CE31-0017]
- OCEVU Labex [ANR-11-LABX-0060]
- program National Cosmology et Galaxies (PNCG) of CNRS/INSU
- CEA
- CNES
- ERC [339659]
- Simons Foundation
- German Federal Ministry of Education and Research (BMBF)
- German State Ministries for Research of Baden Wurttemberg
- Bayern
- Nordrhein-Westfalen
- European Research Council (ERC) [339659] Funding Source: European Research Council (ERC)
The study reveals a correlation between the specific angular momentum of SFGs and stellar mass, with a significant scatter of the sAM sequence based on the dynamical state. It is suggested that SFGs may undergo a dynamical transformation and lose their sAM before transitioning into a passive state morphologically.
We investigate the specific angular momentum (sAM) j((star)((star) proportional to M-star(alpha) with an index alpha varying from alpha = 0.3 to alpha = 0.5, from log M-star/M-circle dot = 8 to log M-star/M-circle dot = 10.5. The UDF sample supports a redshift evolution (j) over tilde (star proportional to) (1 + z)(a), with a = 0.27(-0.56)(+0.42) which is consistent with the (1 + z)(-0.5) expectation from a universe in expansion. The scatter of the sAM sequence is a strong function of the dynamical state with logj vertical bar(M star) proportional to 0.65(-0.08)(+0.06) x log(V-max/sigma), where sigma is the velocity dispersion at 2R(e). In TNG50, SFGs also form a (j) over tilde (star) - M-star (V/sigma) plane, but it correlates more with galaxy size than with morphological parameters. Our results suggest that SFGs might experience a dynamical transformation, and lose their sAM, before their morphological transformation to becoming passive via either merging or secular evolution.
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