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Different higher order kinematics between star-forming and quiescent galaxies based on the SAMI, MAGPI, and LEGA-C surveys.
- Source :
- Monthly Notices of the Royal Astronomical Society; 10/20/2023, Vol. 525 Issue 2, p2765-2788, 24p
- Publication Year :
- 2023
-
Abstract
- We present the first statistical study of spatially integrated non-Gaussian stellar kinematics spanning 7 Gyr in cosmic time. We use deep, rest-frame optical spectroscopy of massive galaxies (stellar mass |$M_\star \gt 10^{10.5} \, \mathrm{M_\odot }$|) at redshifts z = 0.05, 0.3, and 0.8 from the SAMI, MAGPI, and LEGA-C surveys, to measure the excess kurtosis h <subscript>4</subscript> of the stellar velocity distribution, the latter parametrized as a Gauss–Hermite series. We find that at all redshifts where we have large enough samples, h <subscript>4</subscript> anticorrelates with the ratio between rotation and dispersion, highlighting the physical connection between these two kinematic observables. In addition, and independently from the anticorrelation with rotation-to-dispersion ratio, we also find a correlation between h <subscript>4</subscript> and M <subscript>⋆</subscript>, potentially connected to the assembly history of galaxies. In contrast, after controlling for mass, we find no evidence of independent correlation between h <subscript>4</subscript> and aperture velocity dispersion or galaxy size. These results hold for both star-forming and quiescent galaxies. For quiescent galaxies, h <subscript>4</subscript> also correlates with projected shape, even after controlling for the rotation-to-dispersion ratio. At any given redshift, star-forming galaxies have lower h <subscript>4</subscript> compared to quiescent galaxies, highlighting the link between kinematic structure and star-forming activity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 525
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 171877173
- Full Text :
- https://doi.org/10.1093/mnras/stac3536