Direct geometrical measurement of the Hubble constant from galaxy parallax: predictions for the Vera C. Rubin Observatory and Nancy Grace Roman Space Telescope

Abstract

We investigate the possibility that a statistical detection of the galaxy parallax shift due to the Earth's motion with respect to the CMB frame (cosmic secular parallax) could be made by the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) or by the Nancy Grace Roman Space Telescope (NGRST), and used to measure the Hubble constant. We make mock galaxy surveys which extend to redshift z=0.06 from a large N-body simulation, and include astrometric errors from the LSST and NGRST science requirements, redshift errors and peculiar velocities. We include spectroscopic redshifts for the brightest galaxies (r < 18) in the fiducial case. We use these catalogues to make measurements of parallax versus redshift,for various assumed survey parameters and analysis techniques. We find that in order to make a competitive measurement it will be necessary to model and correct for the peculiar velocity component of galaxy proper motions. It will also be necessary to push astrometry of extended sources into a new regime, and combine information from the different elements of resolved galaxies. In an appendix we describe some simple tests of galaxy image registration which yield relatively promising results. For our fiducial survey parameters, we predict an rms error on the direct geometrical measurement of H0 of 2.8% for LSST and 0.8% for NGRST.

Version accepted by MNRAS. Includes new appendix with tests on observational data. Article has 17 pages and 11 figures

References in corpus (14)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• The Expansion of the Universe is Faster than Expected
• The 6dF Galaxy Survey: Peculiar Velocity Field and Cosmography
• Measuring the Hubble constant with Type Ia supernovae as near-infrared standard candles
• The Intrinsic Properties of SDSS Galaxies
• The peculiar velocity field up to $z\sim 0.05$ by forward-modeling Cosmicflows-3 data
• Photometric Redshifts with the LSST: Evaluating Survey Observing Strategies
• Theia: Faint objects in motion or the new astrometry frontier
• Planck intermediate results. LVI. Detection of the CMB dipole through modulation of the thermal Sunyaev-Zeldovich effect: Eppur si muove II
• Secular Extragalactic Parallax: Measurement Methods and Predictions for Gaia
• Measuring the Expansion of the Universe Through Changes in the CMB Photosphere

Cited by in corpus (6)

• A buyer's guide to the Hubble Constant
• Relative astrometry in an annular field
• Ultra Long-Term Cosmology and Astrophysics
• The Universe is Brighter in the Direction of Our Motion: Galaxy Counts and Fluxes are Consistent with the CMB Dipole
• Constraining H0 Via Extragalactic Parallax
• Pixel centroid characterization with laser speckle and application to the Nancy Grace Roman Space Telescope detector arrays