The reference survey, simulated data sets, and forecasts presented here will inform community decisions on the final scope and design of the Roman HLSS. This provides a useful reference for future optimizations. 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 deg 2 (requiring ∼1.5 yr of observing time) provides the most compelling stand-alone constraints on dark energy from Roman alone. 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 find that the reference HLSS would measure ∼10 million H α galaxy redshifts that densely map large-scale structure at z = 1–2 and 2 million galaxy redshifts that sparsely map structures at z = 2–3.
APPILY EVER AFTER RACHEL SILVERMAN FULL
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 deg 2 of HLSS grism spectroscopy. We summarize the flowdown of the Roman science objectives to the science and technical requirements of the HLSS. We present a reference HLSS that maps 2000 deg 2 and achieves an emission-line flux limit of 10 −16 erg s −1 cm −2 at 6.5 σ, requiring ∼0.6 yr of observing time.
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 deg 2 wide-field camera.
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