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Clustering in the simulated H α galaxy redshift survey from Nancy Grace Roman Space Telescope

Zhai, Zhongxu and Chuang, Chia-Hsun and Wang, Yun and Benson, Andrew and Yepes, Gustavo (2021) Clustering in the simulated H α galaxy redshift survey from Nancy Grace Roman Space Telescope. Monthly Notices of the Royal Astronomical Society, 501 (3). pp. 3490-3501. ISSN 0035-8711. doi:10.1093/mnras/staa3911.

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We present a realistic 2000 deg² H α galaxy mock catalogue with 1 < z < 2 for the Nancy Grace Roman Space Telescope (Roman) galaxy redshift survey, the High Latitude Spectroscopic Survey (HLSS), created using Galacticus, a semi-analytical galaxy formation model, and high-resolution cosmological N-body simulations. Galaxy clustering can probe dark energy and test gravity via baryon acoustic oscillation (BAO) and redshift space distortion (RSD) measurements. Using our realistic mock as the simulated Roman HLSS data, and a covariance matrix computed using a large set of approximate mocks created using EZMOCK, we investigate the expected precision and accuracy of the BAO and RSD measurements using the same analysis techniques used in analysing real data. We find that the Roman H α galaxy survey alone can measure the angular diameter distance with 2 per cent uncertainty, the Hubble parameter with 3–6 per cent uncertainty, and the linear growth parameter with 7 per cent uncertainty, in each of four redshift bins. Our realistic forecast illustrates the power of the Roman galaxy survey in probing the nature of dark energy and testing gravity.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Zhai, Zhongxu0000-0001-7984-5476
Chuang, Chia-Hsun0000-0002-3882-078X
Benson, Andrew0000-0001-5501-6008
Additional Information:© 2020 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 2020 December 15. Received 2020 November 13; in original form 2020 July 15. Published: 21 December 2020. We thank the anonymous referee for the valuable comments and suggestions that have helped us improve this paper. 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: PYTHON, MATPLOTLIB (Hunter 2007), NUMPY (van der Walt, Colbert & Varoquaux 2011), SCIPY (Jones et al. 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 webpage 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 Europe2016163937
Subject Keywords:methods: numerical –methods: statistical – galaxies: formation – cosmology: large-scale structure of Universe
Issue or Number:3
Record Number:CaltechAUTHORS:20200908-133848337
Persistent URL:
Official Citation:Zhongxu Zhai, Chia-Hsun Chuang, Yun Wang, Andrew Benson, Gustavo Yepes, Clustering in the simulated H α galaxy redshift survey from Nancy Grace Roman Space Telescope, Monthly Notices of the Royal Astronomical Society, Volume 501, Issue 3, March 2021, Pages 3490–3501,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105271
Deposited By: Tony Diaz
Deposited On:08 Sep 2020 20:59
Last Modified:05 Apr 2021 14:57

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