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Linear bias and halo occupation distribution of emission-line galaxies from Nancy Grace Roman Space Telescope

Zhai, Zhongxu and Wang, Yun and Benson, Andrew and Chuang, Chia-Hsun and Yepes, Gustavo (2021) Linear bias and halo occupation distribution of emission-line galaxies from Nancy Grace Roman Space Telescope. Monthly Notices of the Royal Astronomical Society, 505 (2). pp. 2784-2800. ISSN 0035-8711. doi:10.1093/mnras/stab1539.

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We present measurements of the linear galaxy bias of Hα and [O III] emission-line galaxies (ELGs) for the High Latitude Spectroscopic Survey (HLSS) of Nancy Grace Roman Space Telescope (or Roman), using galaxy mocks constructed using semi-analytical model for galaxy formation, Galacticus, with a large cosmic volume and redshift coverage. We compute the two-point statistics of galaxies in configuration space and measure linear bias within scales of 10–50 h⁻¹ Mpc. We adopt different selection algorithms to investigate the impact of the Roman line flux cut, as well as the effect of dust model used to calibrate Galacticus, on the bias measurements. We consider galaxies with Hα and [O III] emissions over the redshift range 1 < z < 3, as specified by the current baseline for the Roman HLSS. We find that the linear bias for the Hα and [O III] ELGs can be expressed as a linear function with respect to redshift: b ≃ 0.9z + 0.5 for Hα (1 < z < 2), and b ≃ z + 0.5 for [O III] (2 < z < 3). We have also measured the halo occupation distributions of these Hα and [O III] ELGs to understand their distribution within dark matter haloes. Our results provide key input to enable the reliable forecast of dark energy and cosmology constraints from Roman.

Item Type:Article
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URLURL TypeDescription Paper
Zhai, Zhongxu0000-0001-7984-5476
Benson, Andrew0000-0001-5501-6008
Chuang, Chia-Hsun0000-0002-3882-078X
Additional Information:© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2021 May 24. Received 2021 May 21; in original form 2021 March 19. Published: 27 May 2021. We thank the anonymous referee for the valuable comments that have helped us to improve this paper. ZZ thanks Santiago Avila for providing their HOD measurement of the eBOSS ELG sample. This work is supported in part by NASA grant 15-WFIRST15-0008, Cosmology with the High Latitude Survey Roman Science Investigation Team (SIT). GY would like to thank MICIU/FEDER (Spain) for financial support under project grant PGC2018-094975-B-C21. The UNIT simulations have been done in the MareNostrum Supercomputer at the Barcelona Supercomputing Center (Spain) thanks to the CPU time awarded by PRACE under project grant number 2016163937. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number ACI-1548562 (Towns et al. 2014). Software used: PYTHON, MATPLOTLIB (Hunter 2007), NUMPY (van der Walt, Colbert & Varoquaux 2011), SCIPY (Jones, Oliphant & Peterson 2001), GEORGE (Ambikasaran et al. 2015), EMCEE (Foreman-Mackey et al. 2013), and HANKEL (Murray & Poulin 2019). Data Availability: The original dark matter halo catalogues are available from the UNIT simulation website. The galaxy mocks are available by request. A public web page presenting the mocks will be available at a later time.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Ministerio de Ciencia, Innovación y Universidades (MICIU)UNSPECIFIED
Fondo Europeo de Desarrollo Regional (FEDER)PGC2018-094975-B-C21
Partnership for Advanced Computing in Europe (PRACE)2016163937
Subject Keywords:methods: numerical – methods: statistical – galaxies: formation – large-scale structure of Universe
Issue or Number:2
Record Number:CaltechAUTHORS:20210819-232219935
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Official Citation:Zhongxu Zhai, Yun Wang, Andrew Benson, Chia-Hsun Chuang, Gustavo Yepes, Linear bias and halo occupation distribution of emission-line galaxies from Nancy Grace Roman Space Telescope, Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 2, August 2021, Pages 2784–2800,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110314
Deposited By: Tony Diaz
Deposited On:20 Aug 2021 17:15
Last Modified:20 Aug 2021 17:15

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