Astrophys. J., 881, 42-42 (2019/August-2)
The Gemini/HST galaxy cluster project: environment effects on the stellar populations in the Lynx clusters at z = 1.27.
JORGENSEN I., HUNTER L.C., O'NEILL C.R., CHIBOUCAS K., COLE R.K., TOFT S. and SCHIAVON R.P.
Abstract (from CDS):
Few detailed investigations of stellar populations in passive galaxies beyond z ≃ 1 are based on deep spectroscopic observations, due to the difficulty in obtaining such data. We present a study of stellar populations, structure, and mass-to-light ratios (M/L) of a large sample of bulge-dominated galaxies in the two z = 1.27 clusters Lynx E and Lynx W, based on deep ground-based optical spectroscopy combined with imaging from the Hubble Space Telescope. We find that Lynx E has a well-defined core of red passive galaxies, while Lynx W lacks such a core. If all the sample galaxies evolve similarly in size from z = 1.27 to the present, the data would allow only 0.1 dex size growth at a fixed dynamical mass. However, to link the Lynx central galaxies to brightest cluster galaxies similar to those of low-redshift clusters, the Lynx galaxies would have to grow by at least a factor 5, possibly through major merging. The M/L ratios and the Balmer absorption lines of the Lynx galaxies are consistent with passive evolution of the stellar populations from z = 1.27 to the present and support ages of 1-3 Gyr. The galaxies in the outskirts of the clusters contain younger stellar populations than found in the cluster cores. However, when evolved passively to z ≃ 0 both populations are consistent with the observed populations in the Coma cluster galaxies. The bulge-dominated emission line galaxies in the clusters are dominated by stellar populations with subsolar metallicities. Thus, additional enrichment of these is required to produce Coma-like stellar populations by z ≃ 0.
© 2019. The American Astronomical Society. All rights reserved.
galaxies: clusters: individual: Lynx E - galaxies: clusters: individual: Lynx W - galaxies: evolution - galaxies: stellar content
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