CaltechAUTHORS
Published March 20, 2022 | Version Submitted + Published
Journal Article Open

The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope

Creators

  • 1. ROR icon Infrared Processing and Analysis Center
  • 2. ROR icon University of Waterloo
  • 3. ROR icon Princeton University
  • 4. ROR icon Cooper Union
  • 5. ROR icon Carnegie Observatories
  • 6. ROR icon The Ohio State University
  • 7. ROR icon Kansas State University
  • 8. ROR icon Jet Propulsion Lab
  • 9. ROR icon California Institute of Technology
  • 10. ROR icon University of Arizona
  • 11. ROR icon Yale University

Abstract

The Nancy Grace Roman Space Telescope will conduct a High Latitude Spectroscopic Survey (HLSS) over a large volume at high redshift, using the near-IR grism (1.0–1.93 μm, R = 435–865) and the 0.28 deg² wide-field camera. We present a reference HLSS that maps 2000 deg² and achieves an emission-line flux limit of 10⁻¹⁶ erg s⁻¹ cm⁻² at 6.5σ, requiring ∼0.6 yr of observing time. We summarize the flowdown of the Roman science objectives to the science and technical requirements of the HLSS. We construct a mock redshift survey over the full HLSS volume by applying a semianalytic galaxy formation model to a cosmological N-body simulation and use this mock survey to create pixel-level simulations of 4 deg² of HLSS grism spectroscopy. We find that the reference HLSS would measure ∼10 million Hα galaxy redshifts that densely map large-scale structure at z = 1–2 and 2 million [O III] galaxy redshifts that sparsely map structures at z = 2–3. We forecast the performance of this survey for measurements of the cosmic expansion history with baryon acoustic oscillations and the growth of large-scale structure with redshift-space distortions. We also study possible deviations from the reference design and find that a deep HLSS at f_(line) > 7 × 10⁻¹⁷ erg s⁻¹ cm⁻² over 4000 deg² (requiring ∼1.5 yr of observing time) provides the most compelling stand-alone constraints on dark energy from Roman alone. This provides a useful reference for future optimizations. The reference survey, simulated data sets, and forecasts presented here will inform community decisions on the final scope and design of the Roman HLSS.

Additional Information

© 2022 The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 October 5; revised 2021 December 20; accepted 2022 January 7; published 2022 March 22. This work is supported in part by NASA grant 15-WFIRST15-0008, Cosmology with the High Latitude Survey Roman Science Investigation Team. This work was done in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. We thank Jeff Kruk for cross-checking the Roman ETC and input on the Roman grism simulations, James Rhoads for communications on Reference Roman HLIS+HLSS sky background assumptions, and Lukas Wenzl for helpful comments on a draft of the paper.

Attached Files

Published - Wang_2022_ApJ_928_1.pdf

Submitted - 2110.01829.pdf

Files

2110.01829.pdf

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Additional details

Identifiers

Eprint ID
113567
Resolver ID
CaltechAUTHORS:20220223-214616322

Related works

Describes
https://arxiv.org/abs/2110.01829 (URL)

Funding

NASA
15-WFIRST15-0008
NASA/JPL/Caltech

Dates

Created
2022-02-24
Created from EPrint's datestamp field
Updated
2023-03-15
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Infrared Processing and Analysis Center (IPAC)