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Large-scale Structures in COSMOS2020: Evolution of Star Formation Activity in Different Environments at 0.4 < z < 4

S. TaamoliDepartment of Physics and Astronomy, University of California, Riverside, 900 University Avenue, Riverside, CA 92521, USAB. MobasherDepartment of Physics and Astronomy, University of California, Riverside, 900 University Avenue, Riverside, CA 92521, USANima ChartabObservatories of the Carnegie Institution of Washington, Pasadena, CA, USABehnam DarvishDepartment of Physics and Astronomy, University of California, Riverside, 900 University Avenue, Riverside, CA 92521, USAJ. R. WeaverDepartment of Astronomy, University of Massachusetts, Amherst, MA 01003, USAShoubaneh HemmatiInfrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USACaitlin M. CaseyDepartment of Astronomy, The University of Texas at Austin, 2515 Speedway Boulevard Stop C1400, Austin, TX 78712, USAZahra SattariDepartment of Physics and Astronomy, University of California, Riverside, 900 University Avenue, Riverside, CA 92521, USAGabriel BrammerCosmic Dawn Center (DAWN), DenmarkP. CapakInfrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USAO. IlbertAix Marseille University, CNRS, LAM, Laboratoire d’Astrophysique de Marseille, Marseille, FranceJ. S. KartaltepeLaboratory for Multiwavelength Astrophysics, School of Physics and Astronomy, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623, USAH. J. McCrackenInstitut d’Astrophysique de Paris, UMR 7095, CNRS, and Sorbonne Université, 98 bis boulevard Arago, F-75014 Paris, FranceA. MonetiInstitut d’Astrophysique de Paris, UMR 7095, CNRS, and Sorbonne Université, 98 bis boulevard Arago, F-75014 Paris, FranceD. B. SandersInstitute for Astronomy (IfA), University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USANicholas Z. ScovilleCalifornia Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USACharles L. SteinhardtCosmic Dawn Center (DAWN), DenmarkSune ToftCosmic Dawn Center (DAWN), Denmark
2024en
ABI

Аннотация

Abstract To study the role of environment in galaxy evolution, we reconstruct the underlying density field of galaxies based on COSMOS2020 (The Farmer catalog) and provide the density catalog for a magnitude-limited ( K s < 24.5) sample of ∼210,000 galaxies at 0.4 < z < 5 within the COSMOS field. The environmental densities are calculated using a weighted kernel density estimation approach with the choice of a von Mises–Fisher kernel, an analog of the Gaussian kernel for periodic data. Additionally, we make corrections for the edge effect and masked regions in the field. We utilize physical properties extracted by LePhare to investigate the connection between star formation activity and the environmental density of galaxies in six mass-complete subsamples at different cosmic epochs within 0.4 < z < 4. Our findings confirm a strong anticorrelation between star formation rate (SFR)/specific SFR (sSFR) and environmental density out to z ∼ 1.1. At 1.1 < z < 2, there is no significant correlation between SFR/sSFR and density. At 2 < z < 4, we observe a reversal of the SFR/sSFR–density relation such that both SFR and sSFR increase by a factor of ∼10 with increasing density contrast, δ , from −0.4 to 5. This observed reversal at higher redshifts supports the scenario where an increased availability of gas supply, along with tidal interactions and a generally higher star formation efficiency in dense environments, could potentially enhance star formation activity in galaxies located in rich environments at z > 2.

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DOI
10.3847/1538-4357/ad32c5

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