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Simulating properties of emission line galaxies from Nancy Grace Roman Space Telescope

Zhai, Zhongxu and Wang, Yun and Benson, Andrew and Colbert, James and Bagley, Micaela and Henry, Alaina and Baronchelli, Ivano (2021) Simulating properties of emission line galaxies from Nancy Grace Roman Space Telescope. . (Unpublished)

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We simulate the emission line galaxy properties for the Nancy Grace Roman Space Telescope by creating a 4 deg² galaxy mock catalog using Galacticus, a semi-analytic model (SAM) for galaxy formation and evolution. The simulated galaxy properties include emission line luminosity, equivalent width (EW), broad band photometry, and spectral energy distribution (SED). We compare this mock catalog with the latest observational data from WISP and MOSDEF. We find that our Galacticus model makes predictions consistent with observational data, over a wide redshift range for multiple emission lines. We use this validated galaxy mock catalog to forecast the photometric completeness of Hα and [OIII] emission lines as a function of line flux cut and H band magnitdue cut, for both Roman and Euclid-like surveys. Our prediction for the photometric completeness of a Euclid-like survey is in good agreement with previous work based on WISP data. Our predictions for the photometric completeness of possible implementations of the Roman High Latitude Wide Area Spectroscopic Survey (HLWASS) provides key input for the planning of such a survey. We find that at H = 24, a Euclid-like survey to the line flux limit of 2 × 10⁻¹⁶ erg/s/cm² is 97% complete, while a Roman HLWASS to the line flux limit of 10⁻¹⁶ erg/s/cm² is only 94.6% complete (it becomes 98% complete at H = 25).

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Zhai, Zhongxu0000-0001-7984-5476
Wang, Yun0000-0002-4749-2984
Benson, Andrew0000-0001-5501-6008
Colbert, James0000-0001-6482-3020
Bagley, Micaela0000-0002-9921-9218
Henry, Alaina0000-0002-6586-4446
Baronchelli, Ivano0000-0003-0556-2929
Additional Information:This work is supported in part by NASA grant 15-WFIRST15-0008, Cosmology with the High Latitude Survey Roman Science Investigation Team (SIT). ZZ would like to thank Anahita Alavi, Andreas Faisst and Xin Wang for helpful and valuable discussions in the observational analysis of emission line galaxies, and Matt Malkan for his helpful comments on a draft of this paper. We are grateful to the MOSDEF team for making their data available to us. 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 et al. 2011), SciPy (Jones et al. 01 ) DATA AVAILABILITY. The original dark matter halo catalogs are available from the UNIT simulation website. The galaxy mocks are available by request. A public webpage presenting the Galacticus mocks will be available at a later time.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
PRACE (Partnership for Advanced Computing in Europe)2016163937
Subject Keywords:galaxies: formation; cosmology: large-scale structure of universe — methods: numerical — methods: statistical
Record Number:CaltechAUTHORS:20220223-214552183
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113560
Deposited By: George Porter
Deposited On:25 Feb 2022 00:17
Last Modified:25 Feb 2022 00:17

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