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- W4210363030 endingPage "A132" @default.
- W4210363030 startingPage "A132" @default.
- W4210363030 abstract "Context: The radial variations of the stellar populations properties within passive galaxies at high redshift contain information about their assembly mechanisms, based on which galaxy formation and evolution scenarios may be distinguished. Aims: The aim of this work is to give constraints on massive galaxy formation scenarios through one of the first analyses of age and metallicity gradients of the stellar populations in a sample of passive galaxies at $z > 1.6$ based on spectroscopic data from the Hubble Space Telescope. Methods: We combined G$141$ deep slitless spectroscopic data and F$160$W photometric data of the spectroscopically passive galaxies at $1.6< z < 2.4$ with $H_{160} < 22.0$ in the field of view of the cluster JKCS $041$. We extracted spectra from different zones of the galaxies, and we analysed them by fitting them with a library of synthetic templates of stellar population models to obtain estimates of the age and metallicity gradients. Results: We obtained reliable measurements of age and metallicity parameters in different spatial zones of $text{four}$ galaxies. We performed spatially resolved measurements in individual high-redshift galaxies without the need of peculiar situations (i.e. gravitational lensing) for the first time. All four galaxies exhibit negative metallicity gradients. Their amplitude, similar to that measured in galaxies in the local Universe, suggests that the stellar populations of passive galaxies from $z sim 2$ to $z = 0$ are not redistributed. Conclusions: Although the sample we analysed is small, the results we obtained suggest that the main mechanism that determines the spatial distribution of the stellar population properties within passive galaxies is constrained in the first $3$ Gyr of the Universe. This is consistent with the revised monolithic scenario." @default.
- W4210363030 created "2022-02-08" @default.
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- W4210363030 date "2022-04-01" @default.
- W4210363030 modified "2023-10-16" @default.
- W4210363030 title "Stellar population gradients at cosmic noon as a constraint to the evolution of passive galaxies" @default.
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- W4210363030 doi "https://doi.org/10.1051/0004-6361/202142523" @default.
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