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• W4324107114 abstract "We present the first study of spatially integrated higher-order stellar kinematics over cosmic time. We use deep rest-frame optical spectroscopy of quiescent galaxies at redshifts z=0.05, 0.3 and 0.8 from the SAMI, MAGPI and LEGA-C surveys to measure the excess kurtosis $h_4$ of the stellar velocity distribution, the latter parametrised as a Gauss-Hermite series. Conservatively using a redshift-independent cut in stellar mass ($M_star = 10^{11},{rm M}_odot$), and matching the stellar-mass distributions of our samples, we find 7 $sigma$ evidence of $h_4$ increasing with cosmic time, from a median value of 0.019$pm$0.002 at z=0.8 to 0.059$pm$0.004 at z=0.06. Alternatively, we use a physically motivated sample selection, based on the mass distribution of the progenitors of local quiescent galaxies as inferred from numerical simulations; in this case, we find 10 $sigma$ evidence. This evolution suggests that, over the last 7 Gyr, there has been a gradual decrease in the rotation-to-dispersion ratio and an increase in the radial anisotropy of the stellar velocity distribution, qualitatively consistent with accretion of gas-poor satellites. These findings demonstrate that massive galaxies continue to accrete mass and increase their dispersion support after becoming quiescent." @default.
• W4324107114 created "2023-03-14" @default.
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• W4324107114 date "2023-03-09" @default.
• W4324107114 modified "2023-09-23" @default.
• W4324107114 title "Evolution in the orbital structure of quiescent galaxies from MAGPI, LEGA-C and SAMI surveys: direct evidence for merger-driven growth over the last 7 Gy" @default.
• W4324107114 doi "https://doi.org/10.48550/arxiv.2303.05520" @default.
• W4324107114 hasPublicationYear "2023" @default.
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