Constructing the Emission-line Galaxy–Host Halo Connection through Auto and Cross Correlations

We investigate the [O ii ] emission-line galaxy (ELG)-host halo connection via auto and cross correlations, and propose a concise and effective method to populate ELGs in dark matter halos without assuming a parameterized halo occupation distribution (HOD) model. Using the observational data from VI...

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Bibliographic Details
Published in:The Astrophysical journal 2022-03, Vol.928 (1), p.10
Main Authors: Gao, Hongyu, Jing, Y. P., Zheng, Yun, Xu, Kun
Format: Article
Language:English
Subjects:
Astrophysics
Correlation
Cross correlation
Dark energy
Dark matter
Emission analysis
Emission line galaxies
Galactic halos
Galaxies
Galaxy dark matter halos
Halos
Luminosity
Observational cosmology
Polls & surveys
Red shift
Redshift surveys
Satellites
Stars & galaxies
Stellar mass
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Summary:We investigate the [O ii ] emission-line galaxy (ELG)-host halo connection via auto and cross correlations, and propose a concise and effective method to populate ELGs in dark matter halos without assuming a parameterized halo occupation distribution (HOD) model. Using the observational data from VIMOS Public Extragalactic Redshift Survey, we measure the auto and cross correlation functions between ELGs selected by [O ii ] luminosity and normal galaxies selected by stellar mass. Combining the stellar–halo mass relation derived for the normal galaxies and the fraction of ELGs observed in the normal galaxy population, we demonstrate that we can establish an accurate ELG–halo connection. With the ELG–halo connection, we can accurately reproduce the auto and cross correlation functions of ELGs and normal galaxies both in real space and in redshift space, once the satellite fraction is properly reduced. Our method provides a novel strategy to generate ELG mock catalogs for ongoing and upcoming galaxy redshift surveys. We also provide a simple description for the HOD of ELGs.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac501b