Journal article
A Gradual Decline of Star Formation since Cluster Infall: New Kinematic Insights into Environmental Quenching at 0.3 < z < 1.1
KJ Kim, MB Bayliss, AG Noble, G Khullar, E Cronk, J Roberson, B Ansarinejad, LE Bleem, B Floyd, S Grandis, G Mahler, MA McDonald, CL Reichardt, A Saro, K Sharon, T Somboonpanyakul, V Strazzullo
Astrophysical Journal | IOP Publishing Ltd | Published : 2023
Abstract
The environments where galaxies reside crucially shape their star formation histories. We investigate a large sample of 1626 cluster galaxies located within 105 galaxy clusters spanning a large range in redshift (0.26 < z < 1.13). The galaxy clusters are massive (M 500 ≳ 2 × 1014 M ⊙) and uniformly selected from the SPT and ACT Sunyaev-Zel’dovich surveys. With spectra in hand for thousands of cluster members, we use the galaxies’ position in projected phase space as a proxy for their infall times, which provides a more robust measurement of environment than quantities such as projected clustercentric radius. We find clear evidence for a gradual age increase of the galaxy’s mean stellar popul..
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Awarded by University of Chicago
Funding Acknowledgements
We thank the referee for constructive comments that improved the quality of the paper. This work was performed in the context of the South Pole Telescope scientific program. The SPT is supported by the National Science Foundation through grant OPP-1852617. Partial support is also provided by the Kavli Institute of Cosmological Physics at the University of Chicago. PISCO observations are supported by NSF AST-1814719. Argonne National Laboratory's work was supported by the U.S. Department of Energy, Office of High Energy Physics, under contract DE-AC02-06CH11357. G.M. acknowledges funding from the European Union's Horizon 2020 research and innovation program under Marie Skodowska-Curie grant agreement No. MARACAS - DLV-896778. A.S. is supported by ERC-StG "ClustersXCosmo" grant agreement 716762, FARE-MIUR grant 'ClustersXEuclid' R165SBKTMA, and the INFN InDark Grant. The Melbourne group acknowledges support from the Australian Research Council's Discovery Projects scheme (DP200101068).