Estimation of the Hubble Constant and Constraint on Descriptions of Dark Energy

Details Estimation of the Hubble Constant and Constraint on Descriptions of Dark Energy Estimation of the Hubble Constant and Constraint on Descriptions of Dark Energy

2009-02-24

arxiv.org/abs/0902.4255v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Whitepaper submitted to the ASTRO2010 cosmology and fundamental physics panel; 9 pages, 5 figures (4 color)

Scientific paper

Joint analysis of Cosmic Microwave Background, Baryon Acoustic Oscillation, and supernova data has enabled precision estimation of cosmological parameters. New programs will push to 1% uncertainty in the dark energy equation of state and tightened constraint on curvature, requiring close attention to systematics. Direct 1% measurement of the Hubble constant (H0) would provide a new constraint. It can be obtained without overlapping systematics directly from recessional velocities and geometric distance estimates for galaxies via the mapping of water maser emission that traces the accretion disks of nuclear black holes. We identify redshifts 0.020.02, out of ~100 known masers. A single-dish discovery survey of >10,000 nuclei (>2500 hours on the GBT) would build a sample of tens of potential distance anchors. Beyond 2020, a high-frequency SKA could provide larger maser samples, enabling estimation of H0 from individually less accurate distances, and possibly without the need for peculiar motion corrections.

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