The Galaxy Halo Connection in Modified Gravity Cosmologies: Environment Dependence of Galaxy Luminosity function

Devi, N. Chandrachani; Rodríguez-Puebla, Aldo; Valenzuela, O.; Avila-Reese, Vladimir; Hernández-Aguayo, César; Li, Baojiu

Abstract

We investigate the dependence of the galaxy–halo connection and galaxy density field in modified gravity models using the N-body simulations for f(R) and nDGP models at z = 0. Because of the screening mechanisms employed by these models, chameleon and Vainshtein, haloes are clustered differently in the non-linear regime of structure formation. We quantify their deviations in the galaxy density field from the standard Λ cold dark matter (ΛCDM) model under different environments. We populate galaxies in haloes via the (sub)halo abundance matching. Our main results are as follows: (1) The galaxy–halo connection strongly depends on the gravity model; a maximum variation of ∼40 per cent is observed between halo occupational distribution (HOD) parameters; (2) f(R) gravity models predict an excess of galaxies in low-density environments of ∼10 per cent but predict a deficit of ∼10 per cent at high-density environments for |fR0| = 10−4 and 10−6 while |fR0| = 10−5 predicts more high-density structures; nDGP models are consistent with ΛCDM; (3) different gravity models predict different dependences of the galaxy luminosity function (GLF) with the environment, especially in void-like regions we find differences around ∼10 per cent for the f(R) models while nDPG models remain closer to ΛCDM for low-luminosity galaxies but there is a deficit of ∼11 per cent for high-luminosity galaxies in all environments. We conclude that the dependence of the GLF with environment might provide a test to distinguish between gravity models and their screening mechanisms from the ΛCDM. We provide HOD parameters for the gravity models analysed in this paper.

Citation

Devi, N. C., Rodríguez-Puebla, A., Valenzuela, O., Avila-Reese, V., Hernández-Aguayo, C., & Li, B. (2019). The Galaxy Halo Connection in Modified Gravity Cosmologies: Environment Dependence of Galaxy Luminosity function. Monthly Notices of the Royal Astronomical Society, 488(1), 782-802. https://doi.org/10.1093/mnras/stz1664

• Journal Article Type: Article
• Acceptance Date: Jun 10, 2019
• Online Publication Date: Jun 16, 2019
• Publication Date: Sep 30, 2019
• Deposit Date: Jun 17, 2019
• Publicly Available Date: Jul 16, 2019
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 488
• Issue: 1
• Pages: 782-802
• DOI: https://doi.org/10.1093/mnras/stz1664
• Public URL: https://durham-repository.worktribe.com/output/1294246
• Related Public URLs: https://arxiv.org/abs/1901.02121