2023MNRAS.525.2789D

Query : 2023MNRAS.525.2789D

2023MNRAS.525.2789D - Mon. Not. R. Astron. Soc., 525, 2789-2805 (2023/October-3)

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 Gyr.

D'EUGENIO F., VAN DER WEL A., PIOTROWSKA J.M., BEZANSON R., TAYLOR E.N., VAN DE SANDE J., BAKER W.M., BELL E.F., BELLSTEDT S., BLAND-HAWTHORN J., BLUCK A.F.L., BROUGH S., BRYANT J.J., COLLESS M., CORTESE L., CROOM S.M., DERKENNE C., VAN DOKKUM P., FISHER D., FOSTER C., GALLAZZI A., DE GRAAFF A., GROVES B., VAN HOUDT J., LAGOS C.D.P., LOOSER T.J., MAIOLINO R., MASEDA M., MENDEL J.T., NERSESIAN A., PACIFICI C., POCI A., REMUS R.-S., SWEET S.M., THATER S., TRAN K.-V., UBLER H., VALENZUELA L.M., WISNIOSKI E. and ZIBETTI S.

Abstract (from CDS):

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 h4 of the stellar velocity distribution, the latter parametrized as a Gauss-Hermite series. Conservatively using a redshift-independent cut in stellar mass ($M_\star = 10^{11}\, \mathrm{M_\odot }$) and matching the stellar-mass distributions of our samples, we find 7σ evidence of h4 increasing with cosmic time, from a median value of 0.019 ± 0.002 at z = 0.8 to 0.059 ± 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 10σ 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.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: fundamental parameters - galaxies: structure

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 825 0
3 COSMOS2015 656506 G 10 02 35.32 +02 17 37.1 25.78 24.79 23.06 22.37 21.067 ~ 9 0
4 LEDA 1118063 G 11 50 00.3282175464 -01 27 48.179876616   17.138   15.789   ~ 14 0

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