http://arxiv.org/abs/2212.08699
The High Latitude Spectroscopic Survey (HLSS) is the reference baseline spectroscopic survey for NASA’s Nancy Grace Roman space telescope, measuring redshifts of $\sim 10$M H$\alpha$ emission line galaxies over a $2000$ deg$^2$ footprint at $z=1-2$. In this work, we use a realistic Roman galaxy mock catalogue to explore optimal modeling of the measured power spectrum. We consider two methods for modelling the redshift-space distortions (one with the canonical Kaiser squashing term $M_A$, and another with a window function on $\beta$ that selects out the coherent radial infall pairwise velocities $M_B$), two models for the nonlinear impact of baryons that smears the BAO signal (one with a fixed ratio between the smearing scales in the perpendicular $k_^\perp$ and parallel $k_^\parallel$ and another where these smearing scales are kept as a free parameters, P${dw}(k|k)$ and P${dw}(k|\Sigma\perp,\Sigma_\parallel)$), and two analytical nonlinear growth corrections (one employing the halo model $F_{HM}$ and another formulated from simulated galaxy clustering of a semi-analytical model $F_{SAM}$). We find that the best model is P${dw}(k|\Sigma\perp,\Sigma_\parallel)M_B$, which leads to unbiased measurements of cosmological parameters. We expect the tools that we have developed to be useful in probing dark energy and testing gravity using Roman in an accurate and robust manner.
K. McCarthy, Z. Zhai and Y. Wang
Tue, 20 Dec 22
25/97
Comments: 14 pages, 6 figures, 4 tables, Submitted to MNRAS 16 Dec 2022
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