Cosmology with the Roman Space Telescope: synergies with the Rubin Observatory Legacy Survey of Space and Time

Author:

Eifler Tim1ORCID,Simet Melanie23,Krause Elisabeth14,Hirata Christopher5,Huang Hung-Jin1ORCID,Fang Xiao1ORCID,Miranda Vivian1,Mandelbaum Rachel6ORCID,Doux Cyrille7ORCID,Heinrich Chen3,Huff Eric3,Miyatake Hironao38910,Hemmati Shoubaneh3,Xu Jiachuan1,Rogozenski Paul4ORCID,Capak Peter11,Choi Ami5,Doré Olivier312,Jain Bhuvnesh7,Jarvis Mike7,Kruk Jeffrey13,MacCrann Niall5,Masters Dan3,Rozo Eduardo4,Spergel David N1415,Troxel Michael16ORCID,von der Linden Anja17,Wang Yun11,Weinberg David H5,Wenzl Lukas18,Wu Hao-Yi5ORCID

Affiliation:

1. Department of Astronomy/Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA

2. Department of Physics and Astronomy, University of California Riverside, 900 University Ave, Riverside, CA 92521, USA

3. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA

4. Department of Physics, University of Arizona, 1118 E Fourth Str, AZ 85721, USA

5. Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA

6. McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA

7. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA

8. Institute for Advanced Research, Nagoya University, Nagoya 464-8601, Japan

9. Division of Physics and Astrophysical Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan

10. Kavli IPMU (WPI), UTIAS, The University of Tokyo, Chiba 277- 8583, Japan

11. IPAC, California Institute of Technology, Pasadena, CA 91125, USA

12. Cahill Center for Astrophysics, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA

13. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

14. Center for Computational Astrophysics, Flatiron Institute, New York, NY 10010, USA

15. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA

16. Department of Physics, Duke University, Durham, NC 27708, USA

17. Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA

18. Department of Astronomy, Cornell University, Ithaca, NY 14853, USA

Abstract

ABSTRACT We explore synergies between the Nancy Grace Roman Space Telescope and the Vera Rubin Observatory’s Legacy Survey of Space and Time (LSST). Specifically, we consider scenarios where the currently envisioned survey strategy for the Roman Space Telescope’s High Latitude Survey (HLS reference), i.e. 2000 deg2 in four narrow photometric bands is altered in favour of a strategy of rapid coverage of the LSST area (to full LSST depth) in one band. We find that in only five months, a survey in the W-band can cover the full LSST survey area providing high-resolution imaging for >95 per cent of the LSST Year 10 gold galaxy sample. We explore a second, more ambitious scenario where the Roman Space Telescope spends 1.5 yr covering the LSST area. For this second scenario, we quantify the constraining power on dark energy equation-of-state parameters from a joint weak lensing and galaxy clustering analysis. Our survey simulations are based on the Roman Space Telescope exposure-time calculator and redshift distributions from the CANDELS catalogue. Our statistical uncertainties account for higher order correlations of the density field, and we include a wide range of systematic effects, such as uncertainties in shape and redshift measurements, and modelling uncertainties of astrophysical systematics, such as galaxy bias, intrinsic galaxy alignment, and baryonic physics. We find a significant increase in constraining power for the joint LSST + HLS wide survey compared to LSST Y10 (FoMHLSwide = 2.4 FoMLSST) and compared to LSST + HLS (FoMHLSwide = 5.5 FoMHLSref).

Funder

National Aeronautics and Space Administration

Office of Research and Economic Development, University of California, Riverside

MIRO

University of Arizona

RDI

Jet Propulsion Laboratory

California Institute of Technology

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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