We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham Research Online
You are in:

The galaxy halo connection in modified gravity cosmologies : environment dependence of galaxy luminosity function.

Devi, N. Chandrachani and Rodríguez-Puebla, Aldo and Valenzuela, O. and Avila-Reese, Vladimir and Hernández-Aguayo, César and Li, Baojiu (2019) 'The galaxy halo connection in modified gravity cosmologies : environment dependence of galaxy luminosity function.', Monthly notices of the Royal Astronomical Society., 488 (1). pp. 782-802.


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.

Item Type:Article
Full text:(VoR) Version of Record
Download PDF
Publisher Web site:
Publisher statement:© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:10 June 2019
Date deposited:16 July 2019
Date of first online publication:16 June 2019
Date first made open access:16 July 2019

Save or Share this output

Look up in GoogleScholar